The question whether to hire an interior designer or an architect for a remodel is one of the most common and most consequential decisions a homeowner will make. Both professionals bring valuable skillsets to your house, but they are not interchangeable, and the wrong decision can lead to costly delays or worse, local code violations that can easily rack up your expenses.

The right choice, of course, depends on the scope of your project. You have to interrogate yourself about the condition of the existing structure, the budget, and you or your family’s long-term goals. Many people assume an architect is only for new construction and an interior designer is only for furniture, but the reality is far more nuanced.

A remodel can range from changing paint and fixtures to moving walls and adding square footage. The professional who should lead the project depends on where your project falls on that spectrum. In some cases, you need both an architect and an interior designer working side by side. In other cases, one of them is enough, and hiring both would be an unnecessary misstep.

This guide will help you decide whether you need an architect or interior designer for your home remodel and understand when bringing both professionals into the project makes sense.

What Is the Difference Between an Architect and an Interior Designer?

An architect is first and foremost a licensed professional trained to design buildings and building systems. Architects study structural concepts, building codes, life safety, waterproofing, thermal performance, and the relationship between a building and its site.

When you hire an architect, you are hiring someone who can take a project from an initial idea through construction drawings and permitting. Architects are legally responsible for the health, safety, and welfare of the people who occupy the spaces they design.

They know how to determine which walls are load bearing and how to move them safely with beams, columns, or other structural solutions. Architects also coordinate with engineers, surveyors, and contractors to ensure the construction matches the approved drawings.

They think about how light enters a room and how the building will age over decades.

An architect is particularly valuable when a remodel involves changing the footprint, roofline, or envelope of a house. The architect’s primary focus is the overall spatial experience and the building’s performance, not the selection of sofa fabric or the color of the kitchen island.

For homeowners considering a structural renovation or larger residential project, we provide residential building design services that address the broader relationship between your structure and space.

What Does an Interior Designer Do?

An interior designer, by contrast, focuses on the human experience inside the space, particularly the finishes, fixtures, furnishings, and decorative elements.

Interior designers are trained in color theory, material selection, space planning for furniture, lighting design, and the psychology of how people use rooms. They know how to create a cohesive palette that flows from room to room and how to select durable, beautiful materials that fit the client’s lifestyle and budget.

Interior designers often have deep relationships with vendors, fabricators, and custom furniture makers, which allows them to source items that are not available to the general public. They can design cabinetry, built-ins, and millwork that maximize storage and function.

Many interior designers are also skilled at space planning within an existing footprint, meaning they can rearrange furniture and fixtures without moving any walls.

The best interior designers understand scale, proportion, and the interplay of light and texture in a way that transforms a house into a sanctuary.

They do not, however, have the architectural training to assess structural stability, specify load-bearing beam sizes, or prepare drawings for a building permit. Hiring an interior designer when you need an architect can result in a beautiful room that is technically unsound or unpermitted.

For homeowners whose projects are primarily concerned with the existing interior, our interior remodeling services cover kitchen, bathroom, and broader home remodeling work.

Training and Licensing

The difference in education and licensing is important to understand.

Architects must earn a professional degree, complete a multi-year internship, and pass a rigorous series of licensing exams before they can legally call themselves architects. This process ensures that they have the technical knowledge to protect public safety.

Interior designers may hold degrees and certifications, and many states require licensing for certain types of commercial work, but residential interior design is not regulated in the same way.

A talented interior designer can be self-taught and highly skilled, while an architect may have little interest in decorative details. The key is not which profession is better, but which one is better suited to your specific project.

If your remodel involves any change to the structure or exterior of the house, you almost certainly need an architect or at least a structural engineer. If your remodel is limited to the surfaces, fixtures, and furnishings inside the existing walls, an interior designer is likely the more efficient and appropriate choice.

Understanding this distinction will save you from spending money on services you do not need or, worse, skipping a service you cannot safely do without.

When Should You Hire an Architect for a Home Remodel?

You should hire an architect when your remodel involves structural changes, additions, or major reconfiguration of the floor plan.

If you plan to remove a wall, especially a load-bearing wall, an architect will determine what structural support is needed and prepare drawings that a contractor can build from safely.

If you are adding a second story, expanding the kitchen into the garage, or building a new primary suite over the family room, an architect is essential.

Architects understand how to integrate new work with the existing foundation, framing, and roof so the house remains stable and watertight. They also handle permit drawings and can represent you during the city or county review process.

Without an architect, you may find that your contractor removes a wall and the floor above begins to sag, or that the building department rejects your permit application because the drawings are incomplete.

An architect also looks at the big picture, such as how moving a staircase will affect the flow of the entire house and whether the new addition will overwhelm the existing architecture.

For any project that changes the building envelope, roofline, or structural system, the architect is an absolute necessity.

When Should You Hire an Interior Designer for a Home Remodel?

You should hire an interior designer when your remodel is primarily cosmetic and the walls are staying where they are.

If you want to refresh a kitchen by painting the cabinets, replacing the countertops, and adding a new backsplash, an interior designer can guide those selections with their sophisticated eye. Which also means, if you want to transform a living room with new lighting, window treatments, furniture, decors, and add a cohesive color story to the entirety of the interiors, the designer is the right professional.

Interior designers are particularly valuable when the project involves custom cabinetry or a full furniture package because they understand how to balance scale and function.

They can help you avoid the common mistake of choosing a sofa that is too large for the room or a light fixture that hangs at the wrong height.

An interior designer also manages the overwhelming number of finish decisions, from tile grout color to hardware finish to the exact sheen of the paint.

When you are not moving walls, adding square footage, or changing the exterior, an architect may be overkill, and an interior designer will deliver more value per dollar.

The right interior designer will also coordinate with your contractor to ensure the selected materials are installed correctly.

When Do You Need Both an Architect and an Interior Designer?

For a large whole-house remodel that includes both structural changes and a complete interior overhaul, you need both professionals working in close collaboration.

The architect will handle the building shell, the new floor plan, the structural modifications, and the permit documents. The interior designer will handle the finish selections, the cabinetry design, the lighting plan, and the furniture.

This division of labor allows each of them to focus on what they do best.

The architect ensures the house is safe, functional, and spatially resolved. The interior designer ensures the house is beautiful and personally expressive.

On our own projects, we often bring in these decisions early, during the schematic design phase, so the interior choices influence the architecture rather than applied as an afterthought.

This collaboration produces a more integrated result than either professional could achieve alone.

The cost of hiring both may seem high, but on a large project it is usually a wise investment that prevents expensive mistakes and future reworks — which are going to cost more anyway.

How Much Does an Architect or Interior Designer Cost?

Budget is a major factor in this decision.

Architects typically charge a percentage of construction cost or an hourly fee, and their services cover design, documentation, and construction administration. Interior designers may charge a flat fee, an hourly rate, or a markup on products they purchase for you.

For a small cosmetic remodel, an architect’s fee may be out of proportion to the total project cost. For a structural remodel, an interior designer’s fee may be wasted because they cannot produce the drawings required for a permit.

We advise clients to think about the professional fees as a percentage of the total project and to weigh the risk of not having the right expertise.

A structural mistake discovered after the walls are closed can cost far more than an architect’s fee. A design mistake that leaves you with a kitchen you hate can cost far more than an interior designer’s fee.

The smartest financial decision is to match the professional to the actual scope of work.

The Risk of Hiring the Wrong Professional

One of the greatest risks in this decision is hiring an interior designer to do work that requires an architect.

Some interior designers have experience with space planning and may suggest moving a wall, but they are not licensed to determine whether that wall is load bearing or to specify the structural beam that must replace it.

If the designer draws a new layout and the contractor builds it without a structural review, the result can be dangerous and uninsurable.

I have seen cases where a homeowner hired a designer to open up a kitchen and the contractor removed a load-bearing wall without a permit. The floor above began to sag, and the homeowner had to spend tens of thousands of dollars on emergency structural repairs.

The inverse risk is hiring an architect to handle a purely cosmetic project and ending up with a technically sound but bland interior because the architect does not specialize in finish selection.

Neither scenario is a criticism of either profession; it is simply a mismatch of scope and expertise.

How to Determine Which Professional Your Remodel Needs

To assess your own project scope, start by asking whether the remodel will change the footprint, structure, or exterior of the house.

If the answer is yes, you need an architect or at least a structural engineer working with a qualified designer.

If the answer is no, you likely need an interior designer.

The next question is whether the project requires a building permit.

Most structural changes, additions, window replacements, and major electrical or plumbing work require permits, and permit drawings must be prepared by a licensed professional.

An interior designer cannot stamp structural drawings, and many jurisdictions will not accept interior design drawings for anything beyond finish selections.

If you are unsure, a brief consultation with an architect can clarify the scope and the required documentation.

A one-hour consultation is a small investment that can prevent a very expensive misunderstanding.

For homeowners who already have a project in mind, you can also review our project estimator to begin thinking about the scale of the work before discussing the project in greater detail.

Architect vs. Interior Designer for Permits and Building Codes

Building codes and permits are a major dividing line for many who are in this industry.

An architect’s drawings will include the technical information a building department needs to verify compliance with the local code: structural calculations, egress details, fire separation, insulation values, and waterproofing details.

An interior designer’s drawings typically focus on space planning, furniture layouts, elevations, and finish schedules, which are not sufficient for a structural permit.

If your remodel will be inspected by the city or county, you need construction documents prepared by a licensed design professional, usually an architect or an engineer.

Some jurisdictions allow homeowners to prepare their own drawings for simple projects, but the moment a load-bearing wall is touched, the rules change.

The architect also knows how to phase the drawings so the contractor can build without guessing.

Guessing is what causes cost overruns and delays.

So if a permit is involved, lean toward hiring an architect unless the project is purely cosmetic and the local authority confirms that no drawings are needed.

For more on the role of drawings in a construction project, see ECAY Design’s guide to building blueprints.

What Does an Architect Do During Construction?

Another key role of the architect is construction administration.

This means the architect visits the site periodically to observe the work, answer the contractor’s questions, and verify that the construction is proceeding according to the stipulated designs.

The interior designer may also visit the site, but their focus is usually on the placement of furniture and the final styling.

The architect’s site visits are technical since they are looking at the framing, waterproofing, flashing, and the structural connections.

This oversight protects you from paying for work that is not done correctly and from a contractor who cuts corners when no one is watching.

The architect’s presence on site also gives you peace of mind because someone with professional training is holding the contractor accountable.

If a dispute arises about whether a detail was built correctly, the architect can make a determination based on the drawings and the code.

This is not a service an interior designer can provide, and it is one of the most valuable reasons to hire an architect for a structural remodel.

Why an Architect Looks at More Than the Interior

The architect brings a holistic view that considers the entire house as a system.

When you move a wall, the architect thinks about how that change affects the heating and cooling loads, the path of natural light, the acoustics between rooms, and the way people move through the space.

When you add a window, the architect thinks about the view, the privacy, the solar gain, and the structural header above the opening.

When you open the kitchen to the living room, the architect thinks about where the cooking smells will go, how the noise from the dishwasher will affect the conversation area, and whether the sight lines will remain pleasing.

This holistic perspective is especially valuable in older homes where the original structure may have settled and the systems are outdated.

An architect can see the house as a whole and make decisions that serve the long-term health of the building, not just the immediate aesthetic goal.

That is not something an interior designer is trained or licensed to do.

What an Interior Designer Adds to a Remodel

The interior designer brings a focused eye for the way a space feels at the human level.

They understand that the height of a light fixture over a dining table changes the intimacy of a meal, and that the shade of white on a wall changes the way the room reads in the morning versus the evening.

They know which fabrics will hold up to children and pets, and which tile will be slippery when wet.

An interior designer can help you make the hundreds of small decisions that collectively determine whether a room feels calm or chaotic, warm or cold, expensive or cheap.

They are often better than architects at listening to a client’s emotional response to a space and translating that into concrete choices.

When your remodel is mostly about making the house look and feel better without moving any walls, the interior designer is the professional who will deliver the greatest visible impact.

Which Remodeling Projects Need an Architect?

Let me give you specific examples of remodel types that clearly need an architect.

Removing a wall between the kitchen and the dining room almost always requires an architect because that wall may be load bearing, and even if it is not, the plumbing, electrical, and mechanical systems may need to be rerouted.

Adding a second story is an architect-led project because it involves new foundations, new framing, new stairs, and a new roof.

Converting an attic into living space requires an architect to assess the roof structure, the ceiling height, the egress windows, and the insulation.

Finishing a basement that involves underpinning or lowering the floor is definitely an architect’s job.

Any addition, whether it is a bump-out for a breakfast nook or a full primary suite, requires the architect’s structural and spatial expertise.

If you attempt one of these projects with only a contractor and an interior designer, you are taking a significant risk that the work will not be safe, permitted, or long lasting.

Which Remodeling Projects Need an Interior Designer?

Conversely, there are remodel types that clearly need an interior designer.

A cosmetic kitchen update where you keep the same layout but replace the cabinet doors, countertops, backsplash, sink, and faucet is an interior design project.

A bathroom refresh where the tub, toilet, and vanity stay in the same positions but everything is resurfaced and restyled is an interior design project.

A whole-house repaint with new lighting, new window treatments, and new furniture is an interior design project.

A built-in wall unit, a custom closet system, or a home office fit-out within an existing room is an interior design project.

In these cases the bones of the house are fine, and the value comes from the designer’s ability to curate a cohesive, beautiful environment.

Hiring an architect for these projects would add cost and time without adding much value, because the architect’s structural and technical skills are not needed.

Why Architects and Interior Designers Should Work Together

When both professionals are needed, the collaboration works best when they are brought together early.

The architect and interior designer should meet with the client at the same time, review the existing conditions together, and agree on the project goals.

The architect then develops the floor plan and the building shell while the interior designer develops the material palette and the interior elevations.

As the design develops, the architect checks that the interior designer’s selections are compatible with the structure and the mechanical systems.

The interior designer checks that the architect’s spatial moves support the furniture and the way the client actually lives.

This back and forth produces a richer result than a sequential handoff, where the architect finishes and then the interior designer tries to decorate a space that may not have been designed with furniture in mind.

I always recommend that clients include the interior designer in the schematic design phase, not after the walls are already framed.

What to Ask Before Hiring an Architect or Interior Designer

Before you hire either professional, ask them about their experience with projects like yours.

Ask to see examples of their work, not just photographs but also references you can call.

Ask whether they have worked with the local building department and whether they are familiar with the specific challenges of your house, such as a steep site, a historic district, or a very old foundation.

Ask how they charge and what is included in their fee, including whether they will manage the contractor or simply provide the drawings.

Ask how they handle changes and what happens if you change your mind midway through the project.

The answers to these questions will tell you more than any portfolio or website.

A professional who is defensive or vague about fees or scope is a red flag.

A professional who asks you detailed questions about how you live and what you want is a good sign.

Common Mistakes When Hiring an Architect or Interior Designer

One of the most common mistakes homeowners make is hiring a professional based on a friend’s recommendation without checking whether that professional’s expertise matches the project.

A friend may have had a wonderful experience with an interior designer who transformed their living room, but that same designer may be out of their depth on a structural kitchen remodel.

Another mistake is trying to save money by acting as your own designer while hiring an architect only for the permit drawings.

The result is often a disjointed house where the architecture and the interiors do not speak to each other.

A third mistake is hiring an architect who is too rigid to listen to your personal style, leaving you with a house that feels like a portfolio piece rather than a home.

The best professional is one who listens first, advises honestly, and is willing to collaborate rather than dictate.

Architect or Interior Designer? Think About the Building as a Whole

In our practice, I often tell clients that the architect is the doctor for the building and the interior designer is the tailor for the wardrobe.

You would not ask a tailor to perform surgery, and you would not ask a surgeon to hem your trousers.

Both are valuable, but they serve different functions.

The doctor diagnoses the structural and systemic problems and prescribes the appropriate treatment. The tailor makes sure the clothes fit beautifully and express your personality.

A successful remodel requires both medical and sartorial attention in the right proportion.

If the building is sick, you need the doctor first. If the building is healthy but the outfit is dated, you need the tailor.

That simple analogy has helped many clients understand the decision.

When Should You Hire an Architect for a Remodel?

The timing of hiring also matters.

If you are planning a remodel that may involve structural changes, hire the architect at the very beginning, before you buy materials or sign a contractor.

The architect can help you determine whether your wish list is feasible within your budget and whether the existing house can support your dreams.

If you wait until after you have already bought the tile and the plumbing fixtures, the architect may have to design around those choices, which limits the design and may force compromises.

For an interior design project, you can hire the designer once you have a clear sense of the scope and the rooms involved.

The designer can then help you set the budget for finishes and furnishings and create a plan that can be implemented in phases if needed.

Either way, the earlier you bring in the right professional, the more money and heartache you will save.

If you are still determining where your project should begin, our home design process explains how ECAY approaches the stages of residential design and the decisions that happen along the way.

The Architect’s Role in the Los Angeles Permit Process

The permit process is another area where the architect’s value is impossible to overstate.

An experienced architect knows what the local building department expects, how to submit drawings that will pass review, and how to respond to plan-check comments without excessive delay.

They also know when to bring in a structural engineer and how to coordinate the engineer’s work with the architect’s drawings.

This expertise can save weeks or months of back and forth with the city.

An interior designer, unless they have extensive experience with permitting, may not know the specific code requirements for stair dimensions, egress windows, or structural details.

If your project requires a permit and you are considering an interior designer, ask directly whether they can produce the necessary drawings or whether they work with an architect who can.

If the answer is unclear, you may need to hire both or to hire the architect first and bring the designer in later.

For a Los Angeles homeowner, this distinction becomes especially important because residential remodels can involve structural work, additions, exterior changes, and permitting requirements that go well beyond interior finishes.

When an Interior Designer Can Manage the Remodel

For a project that is purely cosmetic, an interior designer can also manage much of the project coordination that an architect would otherwise handle.

They can schedule the painter, the tile installer, the window treatment fabricator, and the furniture delivery.

They can be on site to receive deliveries and to make sure the paint color matches the sample.

They can troubleshoot the inevitable last-minute problems, such as a backordered fabric or a light fixture that arrives damaged.

This project management role is especially valuable for busy homeowners who do not have the time to coordinate multiple trades and vendors.

The interior designer’s fee for this service is often offset by the trade discounts they pass along and the mistakes they prevent.

For a large structural remodel, the architect typically coordinates the contractors and engineers, while the interior designer coordinates the finish vendors, creating a seamless team.

Can an Architect and Interior Designer Work Together?

Some homeowners worry that hiring both an architect and an interior designer will create conflict or duplicate effort.

In our experience, the opposite is true when the roles are clearly defined.

The architect is responsible for the building shell, the structure, the layout, and the permit.

The interior designer is responsible for the interior work, the finishes, the furniture, and the styling.

There will be some overlap, such as the design of the kitchen cabinetry, but a good collaboration resolves those overlaps through conversation, not turf battles.

The client benefits from having two sets of eyes and two areas of expertise.

The architect may catch a structural issue with a floating shelf, and the interior designer may catch a sight-line problem with a proposed window.

Together they produce a more complete design than either could alone.

You can see examples of how ECAY approaches residential projects across different Los Angeles neighborhoods in our residential project portfolio. The portfolio includes projects in Studio City, Beverly Hills, West Hollywood, North Hollywood, Calabasas, and Los Angeles.

Final Answer: Do You Need an Architect or an Interior Designer?

In the end, the decision to hire an interior designer or an architect for a remodel comes down to a clear-eyed assessment of what the project actually requires.

If you are changing the structure, the footprint, the roofline, or the exterior, hire an architect. If you are updating the surfaces, the fixtures, the furniture, and the decor within the existing walls, hire an interior designer.

If you are doing both, hire two and let them collaborate.

Do not try to save money by asking one professional to do the other’s job, because the savings will disappear in rework and future regrets. Do not assume that a beautiful portfolio means a professional can handle your specific scope.

Ask questions and choose the professional whose training and experience match the work you expect them to do.

A remodel is an investment in your home and your daily life, and the right professional partnership is the foundation of that investment.

When you choose well, the result is a house that is safe, functional, and deeply personal, a place that serves you not just on move-in day but for many years to come.

If you are considering a home remodel in Los Angeles and are unsure whether your project requires architectural design, interior remodeling, or both, contact ECAY Design to discuss the scope of your project.