How Much Does An Interior Designer Cost?

One of the questions I'm asked most often is, "How much does an interior designer cost?"

It's a completely fair question, but also one that's surprisingly difficult to answer with a single number.

Interior design fees can feel opaque from the outside, partly because every project is different. The scale of the renovation, the level of involvement, the complexity of the design and the procurement process all influence how fees are structured.

That said, there are some useful guidelines that can help you understand whether full interior design is the right fit for your project.

What Does An Interior Designer Typically Charge?

As a general rule of thumb, full interior design services often account for around 15–20% of the total project budget.

If you're also working with an architect, combined professional fees can often sit closer to 25% of the overall project cost.

That can sound like a significant investment, but it's important to look at those figures in context. Interior designers aren't simply selecting furniture or choosing paint colours. They're helping shape the project from the earliest planning stages, coordinating countless decisions and reducing costly mistakes that can quickly exceed the original fee.

When Does Full Interior Design Make Sense?

One thing I always try to be honest about is whether full design support genuinely makes financial sense.

In my view, a full interior design service is usually most appropriate when the overall project budget is at least £150,000.

If the project also involves an architect, I'd generally expect the overall renovation budget to be closer to £300,000 before both professional teams can work comfortably within it.

Below those figures, design fees can begin taking too much away from the budget available for construction, materials and furnishings themselves.

That's not to say good design isn't valuable on smaller projects. Quite the opposite.

It simply means a different type of service may be more appropriate.

Good Advice Doesn't Always Mean Full Design

Interestingly, it's rarely the clients with a £10,000 budget who ask this question.

They already know they'll be making many of the decisions themselves.

More often, it's homeowners with budgets between £50,000 and £100,000 who assume full interior design will naturally fit within their project. Sometimes it does. Often it doesn't.

A good designer should feel comfortable saying that.

Taking on a project that doesn't have enough budget for the service rarely benefits anyone. Honest advice at the beginning almost always leads to a better outcome.

Interior Design Consultancy Is Changing The Industry

One of the most positive developments in recent years has been the growth of interior design consultancy.

Rather than committing to a full design service, homeowners can now book a consultation, a half day or a full day with an experienced interior designer to answer the questions that matter most.

Can this wall come down?

Should the bath move?

Which kitchen layout works best?

Is this contractor the right choice?

What paint colours work with the existing architecture?

These shorter sessions give homeowners confidence at the moments when expert advice has the greatest impact, whilst still allowing them to manage much of the project themselves.

Good design has become far more accessible than it once was.

The Value Of Full Interior Design

If your renovation budget does comfortably support a full interior design service, my advice is usually very simple: use it.

The value often extends far beyond the drawings or furniture selections themselves.

Clear decision-making, coordinated procurement, realistic budgeting, trusted contractors and avoiding expensive mistakes all contribute to a smoother renovation. More often than not, those savings outweigh the design fee itself.

Like most professional services, good interior design isn't simply about creating something beautiful.

It's about helping you spend your renovation budget wisely.

If you're considering a residential renovation and aren't sure which level of design support is right for your project, you can explore our FAQs or get in touch. We're always happy to talk through your plans and help you understand which approach makes the most sense for your budget and ambitions.