The short answer
For a new build house, architects most often charge a percentage of the construction cost — commonly around 8%–15% for a full service that runs from concept design through planning and technical drawings to overseeing the build. A new build is the most design-led and complex type of residential project, so it sits towards the fuller end of architect involvement and the percentage reflects that. Some practices offer a fixed fee for the design and planning stages and a percentage for construction. The fee is separate from the build cost itself (the largest expense by far), the land, the structural engineer and other consultants, the planning fee, and Building Control. For a one-off house, an architect's design skill is usually where the value is clearest.
Designing a house from scratch is the project where an architect's role is largest, so the fee and the value are both at their highest. Here's how it's typically priced and what it covers.
Architect cost — new build house
- Full service~8%–15% of build cost
- Common splitFixed for design, % for build
- Most design-led projectYes
- SeparateLand, engineer, council fees
- Biggest cost overallThe build itself
What a full service covers
A new build typically uses a full architectural service across the RIBA Plan of Work stages:
- Brief and feasibility (Stages 0–1): assessing the plot, constraints, budget and what's achievable.
- Concept and developed design (Stages 2–3): developing the house design and the planning application.
- Technical design (Stage 4): the detailed building-regulations and construction drawings, coordinated with a structural engineer and other consultants.
- Tender (Stages 4–5): obtaining and comparing builder prices.
- Construction (Stage 5): administering the build, site inspections, queries and certifying payments — important on a one-off house where there's no template to fall back on.
Because a new build is bespoke from the ground up, every stage carries real design and coordination work, which is why architect involvement (and the percentage) is at the higher end compared with a simple extension.
Fees and the costs around them
The architect's fee is a meaningful but minority share of a new-build budget — the construction cost dominates. Several other professional fees sit alongside the architect's, and the plot itself is a separate, often large, cost.
| Item | Indicative basis | Notes |
|---|---|---|
| Architect — full service | ~8%–15% of build | design through to overseeing build |
| Architect — design & planning only | Often fixed fee | you arrange the rest |
| Structural engineer | Separate fee | foundations, frame, structure |
| Other consultants | Separate | energy, drainage, surveys |
| Planning + Building Control | Paid to council | statutory fees |
Indicative UK basis for guidance only. Excludes land, the build cost and VAT. Source: RIBA fee guidance and Checkatrade cost guides.
Why an architect usually earns the fee on a new build
Of all residential projects, a new build is where an architect's contribution is most direct. There's no existing house to constrain or guide the design, which means every decision — orientation, light, layout, how the house sits on the plot, how it performs thermally — is an open design question. Good answers to those questions shape how the home lives for decades and a large part of its value; weak answers are expensive and permanent. That's the case for paying for design skill here rather than treating drawings as a commodity.
An architect also coordinates the web of consultants a new build needs — structural engineer, energy assessor, drainage, sometimes ecology or arboriculture — and administers the build so the house that gets constructed matches the one that was designed and approved. On a self-build in particular, having a professional overseeing the construction stage can prevent costly misunderstandings on site. None of this removes the need to budget carefully: the architect's fee, the consultants, the statutory fees and above all the build cost all have to be planned together. But on a one-off house, the design-led nature of the project is exactly what an architect is for, which is why this is the project type where their fee most reliably repays itself.
Full service or partial — choosing your level
Even on a new build you can choose how much of the architect's service you take, and the right level depends on your experience and how involved you want to be:
- Full service: the architect takes the project from brief through planning and technical design to administering the build on site. This gives the most continuity and oversight, and is the usual choice where you want one professional accountable from idea to completion.
- Design and planning only: the architect develops the design and gets planning permission, then you take over — often with a design-and-build contractor or other professionals producing the technical drawings and running the site. This lowers the architect's fee but shifts responsibility for the later stages to you or others.
- A blend: a full design and technical service, but with you or a separate project manager running the construction stage.
The construction stage is where the choice matters most. On a one-off house there's no template to fall back on, so having the architect inspect progress, answer the builder's queries and certify that work matches the design can prevent expensive misunderstandings — particularly valuable if you're a first-time self-builder. If you're experienced or have a trusted contractor, you might take a lighter service. The key is to decide this consciously rather than by accident: a lower fee that quietly drops the construction stage means you'll be managing the build yourself, which is a real job. Match the level of service to how much of the project you genuinely want to run, and budget the whole thing — design, consultants, statutory fees and the build — as one plan from the outset.
Frequently asked questions
What percentage do architects charge for a new build?
For a full service from design through to overseeing the build, architects commonly charge around 8%–15% of the construction cost for a new build house. A new build is design-led and complex, so it sits towards the fuller end of architect involvement.
Is the architect's fee on top of the build cost?
The percentage is applied to the construction cost rather than added to it as a separate build line, but the fee is a real cost on top of the build, alongside the land, the structural engineer, other consultants and the statutory planning and Building Control fees.
Do I need an architect to build a house, or can I use a designer?
You're not legally required to use an architect, and a designer or technologist can produce drawings. But a new build is the most design-led project type, and an architect's design skill and coordination across the RIBA stages is usually where the value is clearest for a one-off home.
Sources & further reading
- RIBA — how much does an architect cost
- RIBA — Plan of Work
- HomeOwners Alliance — self build and new homes
Figures on this page are typical UK ranges drawn from published sources and depend on your specific project. They are guidance, not a quotation.