What an interior designer actually does
An interior designer plans how a space will look and work. That usually includes layouts, finishes, lighting, furniture and fixtures, and often the coordination of the people who build and install them. Many designers also manage ordering, deliveries and the final styling of a room.
Scope varies a lot. Some designers work on a single room for an hour or two of advice. Others run a whole renovation, working alongside architects and builders. Knowing which kind of help you want is the first step to a good working relationship. If you want to understand the principles a designer works from, start with interior design basics.
When to bring a designer in
Earlier is generally better. Designers can often help most before big, hard-to-reverse decisions are made, such as moving walls, ordering custom cabinetry or buying large furniture. If you are building or renovating, involving a designer once the floor plan is settled lets them weigh in on things like window positions, lighting and storage.
If you have already started, it is usually still worth talking to one. Many designers are comfortable stepping into a half-finished project and helping you get it back on track.
Finding and shortlisting designers
- Look at portfolios. Designer websites and platforms such as Houzz show past work. Look for a range of projects, not just one look, and for projects similar in size and budget to yours.
- Ask for referrals. Friends, architects and builders you trust often know designers they like working with.
- Shortlist two or three. Talk to a small number rather than collecting a long list.
- Check how they work. Some designers offer full service, some offer consultations only, and some work online. See the questions to ask an interior designer for a full list to use while you vet them.
The first consultation
The first meeting is a chance for both sides to decide whether the fit is right. Designers commonly ask about your style, how you use the room, what you want to keep, and your budget and timeline. It helps to bring:
- A floor plan or measurements, if you have them
- Photos of the space and any furniture you plan to keep
- Images you like (and ones you do not), such as a Pinterest or Houzz board
- A realistic budget range and a target date
- Notes on how your household lives in the space, including any accessibility needs
Some designers charge for this meeting, so ask when you book.
Agreeing scope, fees and a contract
Before work starts, you should know what the designer will do, what it will cost and how payment works. Designers commonly charge hourly, by flat fee, as a percentage of the project, or through a markup on products. Each has trade-offs, covered in more detail in our guide to interior designer fees.
A written agreement normally spells out the services, the fee structure, payment schedule, who orders and pays for products, and how changes are handled. If anything is unclear, ask before signing.
How the project usually runs
Most projects follow a similar sequence: measuring and information gathering, a concept (mood boards, layouts, sample selections), budget refinement, your approval, then ordering, installation and final styling. Larger projects add detailed drawings and trade coordination. Our walkthrough of an interior design project from start to finish explains each stage and the decisions you will be asked to make.
Being a good client
- Be honest about budget. A designer can only choose realistic options if they know your range. Hiding the number tends to waste time on both sides.
- Say what you dislike. Knowing what you do not want is often as useful as knowing what you do.
- Give specific feedback. “The blue feels too cold” is easier to act on than “I do not love it.”
- Decide on time. Delays in approvals can push back orders and installation.
- Keep communication in one place. Agree on how and how often you will touch base, and stick to it.
- Trust the process, but speak up. A good designer will explain their reasoning and welcome questions.
When things go wrong
Problems are most often about mismatched expectations, such as budget, timeline or taste. Raise concerns early and in writing. Ask the designer how they propose to fix the issue. If the relationship is not working, check what your agreement says about ending the engagement and what you would owe for work done so far.
Common questions
What is the 70/30 rule in interior design?
It is a loose rule of thumb that is mostly mentioned for colour: roughly 70 percent of a space in a main colour or look, and about 30 percent in a contrasting or accent one. Sources describe it differently, and it is a guide rather than a requirement. It does not relate to how designers charge.
Do you need a degree to be an interior designer?
Requirements differ by region. In some places the title “interior designer” is regulated and requires specific education, exams or registration, while in others anyone can offer decorating services. Professional bodies such as ASID have their own membership categories, which may differ by qualification; check the organisation directly for current criteria. If credentials matter to you, ask the designer about their training and any licences.
How much should I pay for an interior designer?
It depends on scope, location and the designer’s experience, and quoted figures vary widely. Our page on interior designer fees explains the common structures and what affects the price. Get written quotes from more than one designer and compare what each includes.