Ask most people what an interior designer does and you'll hear some version of "picks furniture and paint colors." That's the part of the job that shows up in photographs. It's also a small part of the work.
An interior designer plans how a space works, how it looks, and how it gets built and furnished, then manages the process of making it real. The finished room is the visible result of a lot of decisions made earlier, mostly on paper and mostly before anything is ordered. Here's what that work looks like.
1. Understanding how you live
Every project starts with questions. How many people use the space, and when? Where do guests gather? What annoys you about your current layout? What do you want to keep? A designer is listening for the practical patterns of a household as much as for style preferences, because the best-looking room still fails if it doesn't suit the way you use it.
This is also when the designer learns the project's constraints: the budget, the timeline, the architecture, and whether you're renovating, building, or simply furnishing.
2. Space planning
Space planning is the foundation of everything else. The designer decides how rooms are arranged, how furniture fits, how people move through the space, and where lighting, outlets, and storage need to go. On a renovation, this includes whether walls move, how a kitchen is organized, and how a primary suite connects to its bath and closet.
Good planning is invisible. A room that simply feels right-sized and easy to move through usually owes that to decisions made before a single finish was chosen. See our space planning service for more on how this works.
Space Planning
3. Developing the design concept
Once the layout is settled, the designer builds the visual direction: the palette, materials, textures, furniture style, and overall mood of the home. This is usually presented through mood boards, material samples, and preliminary selections so you can react to something concrete instead of imagining it. Our concept design service is this stage on its own.
4. Drawings and specifications
This is the least glamorous and most important stage. The designer turns the concept into precise documents: floor plans, elevations, lighting plans, millwork drawings, and a schedule of every finish and fixture with exact sizes, colors, and model numbers.
Contractors build from these documents, and vendors order from them. When a project goes over budget or comes out different from what was promised, an incomplete or vague set of specifications is often the reason.
5. Budgeting, sourcing, and ordering
A designer sources furniture, fabrics, lighting, stone, tile, and hardware, often from trade-only vendors, and builds the budget as selections are made. Once you approve them, the designer places the orders, tracks lead times (which can run from weeks to many months), receives and inspects deliveries, and resolves problems such as damaged goods or wrong finishes.
On a full project this can involve dozens of vendors. Keeping it organized is a large share of the work, and it's work you don't see. For clients who want help with the sourcing alone, our furniture sourcing service covers it.
6. Working with architects and contractors
On a renovation or new build, the designer is the design voice during construction. That means answering contractor questions, reviewing submittals and samples, visiting the site to check progress, and catching places where what's being built differs from what was drawn.
A designer doesn't build anything or replace the contractor or architect. The designer's job is to make sure the design intent survives construction.
Residential Design
7. Installation and styling
The last step is putting it all together: furniture delivered and placed, window treatments hung, rugs laid, lighting adjusted, art hung, and accessories arranged. This is when the project becomes a home. A thorough designer stays through installation to correct small things on the day, rather than handing over a list of unfinished items.
What an interior designer doesn't do
It helps to know the boundaries. A designer does not do structural engineering, perform construction, or replace a licensed contractor. Changes to load-bearing walls need an architect or engineer, and the building work is done by licensed trades. A designer coordinates all of that but does not stand in for it.
A designer also isn't the same as a decorator. If you're unsure which you need, read our comparison of interior designers and interior decorators.
When to bring a designer in
As early as you can. The cheapest time to change a layout, move a light fixture, or choose a counter material is on paper, before the contractor starts. Designers brought in late are often asked to work around decisions that were already made, which limits what they can do and usually costs more.
If you're curious how much that help costs, we break it down in how much interior design costs. For a look at how a full engagement runs from first call to finished home, see what full-service interior design includes.
Common questions
What does an interior designer do? They plan how a space works and looks: layout, concept, drawings, selections, ordering, construction coordination, and installation.
What does an interior designer do day to day? A mix of client meetings, planning and drawing, sourcing materials, tracking orders and deliveries, and visiting job sites.
Does an interior designer do construction? No. Licensed contractors and trades do the building. Structural changes also need an architect or engineer.
When should I hire an interior designer? Before construction or major purchases begin, when changes are cheapest.
If you're planning a project in Los Angeles or South Florida and want to talk through what you need, get in touch.
