Design fees for a new build house in the UK typically range between 6% and 15% of the total construction cost, depending on the scope of service, the complexity of the project, and how far into the build process your architect remains involved.
On a £350,000 new build, that means between £21,000 and £52,500 in professional design fees across all stages.
For homeowners also considering whether extending an existing property might be more cost-effective, how much a house extension costs in the UK provides a useful comparison before committing to a new build route.
How Much Does a New Build House Cost to Design?
There is no single answer, because the fee changes with the level of service you commission. A quote covering planning drawings only and a quote covering the full process from concept to construction documents are not comparable on price alone.
| Fee Model | Typical Range | Best For |
| Percentage fee | 6% to 15% of build cost | Larger or complex new builds |
| Fixed fee | £10,000 to £25,000+ | Defined scope, standard plots |
| Hourly rate | £50 to £150 per hour | Early advice, feasibility only |
In 2026, a new build house sitting in the £250,000 to £500,000 construction budget range carries an average architect fee of around 7.5% for full services, based on current UK residential market pricing.
What the Headline Price Should and Should Not Include
A low quote can be a planning drawings package only. That covers the drawings needed to submit a planning application, but nothing beyond that point.
Once planning is approved, you still need technical drawings, building regulations compliance documentation, and construction-ready details before any builder can break ground.
| What May Be Included | What Is Often Excluded |
| Concept sketches and initial layouts | Structural engineering calculations |
| Planning drawings and submission | Building regulations drawings |
| Design revisions (limited number) | Site meetings during construction |
| 3D visualisations (in some packages) | Specialist consultant coordination |
| Planning application management | Post-planning technical package |
The cheapest quote is often drawings only. That is rarely enough for a new build project, where the complexity of technical coordination, compliance, and sequencing requires a more complete professional service.
The Three Common Ways Architects and Designers Charge
Percentage fees are the most common model for new builds. The fee scales with the project value, which means the architect’s commercial interest is tied to a project that gets built, correctly and completely.
Fixed fees offer cost certainty and are better suited to projects where the brief and budget are already well defined.
Hourly rates are used for early-stage consultations, feasibility assessments, or standalone tasks like pre-application advice with the local planning authority.
Is a Higher Fee Always Better?
Not automatically. A higher fee may reflect broader scope, more revision rounds, stronger planning expertise, or involvement through the construction stage.
The question to ask is not “is this cheap or expensive?” but rather “what does this fee actually cover at each stage of my project?”
What Is Included in a New Build House Design Fee?
Understanding how much architectural drawings cost in the UK helps clarify where the money goes across each design stage. Design fees are not paid for a single document.
They cover a phased process, with each stage producing different outputs that serve different purposes.
| Stage | Deliverables | Purpose |
| Feasibility and concept | Initial layouts, site analysis, massing options | Tests whether the project is viable |
| Planning drawings | Location plan, floor plans, elevations, design statement | Secures planning permission |
| Technical and building regs drawings | Detailed construction drawings, specifications | Ensures compliance and buildability |
| Construction documentation | Tender package, schedules, material specs | Enables accurate contractor pricing |
- Concept Design and Early Sketch Options
The first stage is about testing ideas against reality. A feasibility study establishes whether your plot, budget, and design ambitions are compatible before any serious spending begins.
This is where a good architect adds real value. Identifying planning constraints, modelling different layout options, and reducing the chance of a costly redesign later.
- Planning Drawings and Submission Support
Planning drawings are the formal documents submitted to your local authority. They include site plans, floor plans, elevations, and a design and access statement where required.
An architect with strong planning experience navigates the local authority’s requirements, reduces the risk of objections, and manages the application on your behalf.
In the 12 months to September 2025, planning permission was granted for just 209,781 new homes across England, the lowest annual total since 2013 and 38% below the peak seen in early 2022.
- Technical Drawings and Building Regulations
Technical drawings are where the design becomes a buildable instruction set. They coordinate structure, insulation, drainage, openings, and material specifications into a document set that building control and contractors can both work from.
Work to detailed plans through to the end of Stage 4 (RIBA framework) typically represents around 70% of the total architectural fee. For a residential project with a 12% fee on a £500,000 build, the total design fees to this stage would run in the region of £42,000.
- Floor plans with full dimensional detail
- Structural drawings and engineer coordination
- Construction specification and material schedules
- Building regulations submission package
- Energy performance and thermal compliance documentation
- 3D Visuals and Design Presentation
3D visualisations are used to show clients how the finished building will look before any construction begins.
For a new build, where the project has no physical starting point, this kind of visual communication helps validate design decisions and reduces the chance of costly changes once construction has started.
What Affects the Cost of Designing a New Build House?
Two projects with the same floor area can carry very different design fees. The fee reflects the amount of professional time, the complexity of the work, and the level of risk involved in delivering a compliant, approvable scheme.
| Cost Driver | Impact on Fee |
| Floor area and number of storeys | Larger homes require more drawings and coordination |
| Design complexity | Bespoke layouts, split levels, and unusual forms increase design time |
| Planning risk and site constraints | Difficult sites need more preparatory work and planning strategy |
| Scope of service | Drawings only vs. full service to construction stage |
| Location | London and South East fees are typically 35% to 50% higher than national averages |
Size and Floor Area
Build costs for a new house in the UK currently range between £1,800 and £3,500 per square metre in 2026. A standard 3-bedroom detached house of around 120m² carries a build cost of £216,000 to £420,000 before professional fees.
Design fees applied to that range, at 8% to 12%, sit between £17,280 and £50,400 depending on complexity and service scope.
Design Complexity and Custom Features
A simple rectangular plan on a flat, uncontested plot is easier to design and document than a split-level scheme on a constrained urban site.
Unusual layouts, difficult ground conditions, and bespoke structural details each add time to the design process and, by extension, to the fee.
Planning Risk and Site Constraints
Difficult planning contexts, sites in sensitive locations, or projects that push against permitted development limits all require more strategic preparation.
Pre-application discussions with the local authority can reduce uncertainty and improve the outcome, but they add to the professional time required before any formal submission.
Scope of Service
A full architectural service from initial concept through to construction-stage involvement costs more than a drawings-only package. A full-service approach in 2026 typically runs between 10% and 15% of the total build cost.
That additional investment reduces errors on site, manages contractor queries, and provides accountability throughout the delivery stage.
Example Cost Scenarios for a New Build House Design
Real budget planning requires real numbers. The table below shows how design fees translate across different project types.
| Project Type | Build Cost (Est.) | Design Fee Range | What Drives the Fee |
| Simple 3-bed new build, clear site | £220,000 to £280,000 | £13,200 to £28,000 | Straightforward planning, standard layout |
| Mid-range bespoke family home | £300,000 to £420,000 | £21,000 to £50,400 | Custom design, full planning and technical service |
| Complex or planning-sensitive scheme | £400,000 to £600,000+ | £40,000 to £90,000+ | Multiple iterations, specialist input, higher risk |
Simple New Build on a Clear Site
A compact two or three-bedroom home on a standard plot with no unusual planning conditions sits at the lower end of the fee scale. Standard massing, conventional layout, and a clean planning history reduce the time required at every stage.
Mid-Range Custom Family Home
The most common project type for private clients commissioning a new build. This involves concept design, a full planning application, technical drawings, and building regulations submission.
Design complexity is moderate, and the architect is involved from early concept through to construction documentation.
Complex or Planning-Sensitive New Build
Schemes in sensitive locations, on constrained sites, or with bespoke architectural ambitions require more preparation, more consultation, and more documentation.
Fee pressure here comes from the number of revision cycles, specialist input required, and the strategic work needed to build a strong planning case.
How to Compare Quotes and Avoid Hidden Costs
Two quotes on the same project can differ by £15,000 or more, based entirely on what each includes.
Understanding hidden costs of a house extension reveals a similar pattern in residential projects generally: the cheapest quote is often incomplete rather than genuinely competitive.
| Item | Included? | Why It Matters |
| Planning application drawings | Confirm | Without these, you cannot submit |
| Technical and building regs drawings | Confirm | Essential for contractor pricing |
| Number of design revisions included | Confirm | Additional rounds are billed separately |
| Structural engineer coordination | Confirm | Often billed separately |
| Site meetings during construction | Confirm | Critical for quality control |
| VAT | Confirm | Adds 20% to the quoted fee |
What to Check Before You Accept a Quote
Before signing any architectural fee agreement, confirm the following are explicitly included or clearly excluded:
- Planning drawings and submission management
- Building regulations drawings and compliance documentation
- Number of design revisions within the agreed fee
- 3D visualisations, if required
- Structural engineer coordination and input
- Construction-stage involvement and site visits
- Whether VAT is included or additional
A quote that does not specify these items leaves the scope open to interpretation, and interpretation at invoicing stage is rarely in your favour.
Red Flags in Unusually Cheap Quotes
A quote priced significantly below the market range for a new build usually excludes stages rather than delivering them more efficiently.
Common gaps include the post-planning technical package, structural coordination, and any involvement beyond planning approval.
Without those stages, you will need to commission them separately, often at a higher unit cost than had they been included from the start.
Hidden Costs That Catch People Out
Several costs sit outside the design fee and are frequently missed in early budgets:
- Structural and geotechnical engineer fees: typically £1,500 to £5,000
- Planning application fee: £610 per dwelling in England as of April 2026
- Building regulations fees: typically £400 to £1,200 depending on local authority
- Specialist surveys (ecology, drainage, flood risk): £500 to £3,000 depending on site
- Contingency on professional fees: 10% minimum
The professional fees across all consultants including architect, structural engineer, planning consultant, and surveys typically represent 10% to 15% of the total build cost.
Budgeting for them from the outset, rather than adding them once the project is underway, is the most reliable way to maintain control of the total project cost.
Good architectural design is also one of the strongest value drivers in residential property.
Research consistently shows that professionally designed new builds deliver 15% to 25% more value than standard developer homes.
This is a relevant context for clients weighing the cost of whether a house extension adds value to your property against commissioning a new build from scratch.
FAQs
How much does a new build house cost in the UK?
Design fees for a new build house typically range between 6% and 15% of the total construction cost. On a £300,000 build, that puts professional design fees between £18,000 and £45,000 depending on the scope of service commissioned and the complexity of the project.
Is the design fee usually a percentage of the build cost?
Percentage fees are most common for new builds, particularly where the architect is providing a comprehensive service from concept through to construction documentation.
Fixed fees are also used where the project brief and budget are well defined from the start. Hourly rates tend to apply to feasibility and early-stage advisory work only.
What is included in a new build design quote?
A full-service quote typically includes concept design, planning drawings, planning application management, technical and building regulations drawings, and construction documentation.
A basic quote may cover planning drawings only. Always confirm the scope in writing before committing to any fee agreement.
Do I need both planning permission drawings and building regulations drawings?
Yes, they serve entirely different purposes. Planning drawings secure permission from the local authority. Building regulations drawings demonstrate compliance with construction safety and performance standards. Both are required for a new build project, and both carry separate fees.
Before You Budget, Get the Scope Right
The design fee is not a fixed percentage you apply to a build cost. It reflects the scope of work, the complexity of the project, and the level of professional involvement you need from first concept through to handover.
Getting that scope right before committing to any quote is what separates a well-managed project from one that acquires costs it did not plan for.
With 15+ years of experience and 500+ completed projects across new builds, extensions, and residential developments, Archevolve supports homeowners and developers across England from feasibility and planning through to full technical documentation and construction support.
If you are at the early stages of planning a new build and want a clear, honest picture of what design will cost for your specific project, contact Archevolve today.
