Architect Fees Calculator UK 2026 | RIBA Stages 0-7 Costs
Calculate UK architect fees using the RIBA Plan of Work 2020. Percentage fee (5%-15%), fixed fee per stage, or hourly £80-£200. Includes structural engineer, planning permission, building control and party wall costs in the total project professional bill.
Architect Fees Calculator
Enter your project parameters below. The calculator applies 2026 RIBA-aligned percentage fee bands, regional adjustments, complexity factors, and includes ancillary professional fee estimates (structural, planning, building control, party wall).
The RIBA Plan of Work 2020 — what each stage costs
The RIBA Plan of Work, last updated in 2020, is the UK construction industry's standard project process framework. It divides any building project into 8 stages numbered 0 to 7, each with defined deliverables, key tasks, and a customary share of the architect's total fee.
| Stage | Name | Architect tasks | Typical % of total fee |
|---|---|---|---|
| 0 | Strategic Definition | Initial brief workshops, business case (commercial) or aspiration capture (domestic), site appraisal | 1-3% |
| 1 | Preparation and Briefing | Site surveys, existing condition drawings, planning policy research, fee proposals from consultants, project programme | 5-7% |
| 2 | Concept Design | Outline design, options testing, 3D visualisation, planning pre-application advice, structural strategy | 15-20% |
| 3 | Spatial Coordination | Planning permission preparation and submission, design development, coordinated with structural engineer and consultants | 15-20% |
| 4 | Technical Design | Full building regulations drawings, materials specifications, structural details, drainage, services layout, contractor tender package | 25-30% |
| 5 | Manufacturing and Construction | Contract administration, tender evaluation, 8-15 site visits, instruction issuing, certified valuations, defects oversight | 20-30% |
| 6 | Handover | Practical completion certification, snagging schedule, defects liability management, building user information | 3-5% |
| 7 | Use (Post-occupancy) | Post-occupancy evaluation, defects liability period oversight (usually 12 months), final certificate at end of period | 1-3% |
Partial service options
Few domestic clients commission full Stage 0-7 service. Common partial service combinations:
- Stages 0-3 only: Architect designs and obtains planning permission; client takes the planning drawings to a separate building control consultant and a design-and-build contractor for stages 4-5. Total architect fee = 50% of full service. Risk: design intent often eroded during construction without architect oversight.
- Stages 0-4: Architect designs through planning and produces full building control package; client uses a design-and-build contractor for construction (with no architect oversight). Total fee = 70-75%. Risk: medium; better than stages 0-3 because technical details are locked.
- Stage 5 only (Construction Administration): Another architect or designer prepared earlier stages; you appoint a Chartered Architect specifically to administer the building contract. Fee = 25-35%. Suits clients who designed in-house but want professional construction oversight.
- 'Lean' service: Some practices offer a stripped-down package limited to planning + 2-3 site visits during build. Fee = 35-45%. Suits very small projects with experienced contractors.
Source for the Plan of Work framework: architecture.com/knowledge-and-resources/resources-landing-page/riba-plan-of-work.
How UK architect fees are structured in 2026
Three fee structures dominate UK architectural practice. Understanding which structure suits your project is critical to budgeting accurately.
1. Percentage fee (5-15% of construction cost)
The traditional UK structure: architect's fee is calculated as a percentage of the final construction cost, with stage-by-stage instalments tied to the RIBA Plan of Work. Typical 2026 percentages:
- Simple residential: 5-7% (single-storey rear extension, basic loft, standard refurb)
- Medium residential: 8-10% (side-return extension, dormer loft, two-storey extension)
- Complex residential: 11-15% (basement, listed building, contemporary new-build, multiple-storey rebuild)
- Commercial small-scale: 6-9% (office fit-outs, small commercial new-builds)
- Commercial large: 4-6% (industrial sheds, large repetitive office buildings)
The percentage fee advantage: scales naturally with project size; client and architect aligned to deliver the agreed brief; predictable formula. Disadvantage: incentive misalignment — the architect's fee rises with construction cost, so there is a theoretical (rarely real) incentive to specify expensively. Most reputable practices manage this by issuing a written fee cap or by working to a tendered construction cost.
2. Fixed fee (per RIBA stage)
Common on smaller domestic projects. The architect quotes a written fixed fee for each RIBA stage, with payment due on completion of each stage. Typical 2026 fixed fees for a £30,000 single-storey rear extension:
| RIBA stage | Fixed fee |
|---|---|
| Stage 0-1: Briefing & survey | £600 |
| Stage 2: Concept design | £900 |
| Stage 3: Planning permission preparation | £1,400 |
| Stage 4: Building control technical design | £1,800 |
| Stage 5: Construction administration (8 site visits) | £1,200 |
| Stage 6: Handover and snagging | £300 |
| Total fixed fee | £6,200 |
Fixed fee advantage: cost certainty. Disadvantage: any client-driven change after fixing the fee (revised brief, additional design options) is billed as extras at hourly rates.
3. Hourly rate
Used for: feasibility studies, design consultations, advisory work, expert witness, planning appeal evidence. Typical 2026 hourly rates:
- Architectural Technologist (CIAT): £55-£100/hr
- Junior architect (Part 2): £65-£100/hr
- Sole-practitioner architect: £80-£140/hr
- Senior architect (small practice): £100-£170/hr
- Senior architect (mid-size practice): £140-£220/hr
- Partner/Director (large practice): £200-£400/hr
- Specialist heritage architect: £150-£300/hr
- Expert witness work: £200-£500/hr
Always agree a written hourly rate AND a written cap before commissioning hourly work. Without a cap, hourly engagements have a tendency to expand.
Worked example 1: £20,000 single-storey rear extension
A 12m² single-storey rear extension on a Victorian terrace in Sheffield. Standard brick, double-glazed bifold doors, internal opening to kitchen. Permitted development under Class A — no planning permission required, but a Lawful Development Certificate recommended.
| Cost item | Amount |
|---|---|
| Construction cost | £20,000 |
| Architect fee (10% of £20k, simple complexity, full service) | £2,000 |
| Structural engineer (steel beam over opening, foundation calc) | £600 |
| Lawful Development Certificate | £103 |
| Building Control (LABC, plan + inspection) | £500 |
| Party wall surveyor (2 neighbours, simple notices, no awards needed) | £500 |
| Total professional fees | £3,703 |
| Professional fees as % of construction | 18.5% |
| Total project cost | £23,703 |
Note: at this small scale, professional fees are a relatively high percentage (18.5%) of construction. As project size grows, this ratio falls — at £200k construction cost, professional fees are typically 13-15% of construction, and at £1m+ they drop to 10-12%. The fixed minimum costs (planning, building control, party wall) do not scale linearly with project size.
Worked example 2: £40,000 dormer loft conversion (London)
An L-shaped rear dormer loft conversion in a Hackney terraced house. Two new bedrooms and an en-suite. Outside permitted development (most London dormers are because of Article 4 directions or the volume cap of 40m³ for terraces), so planning permission required.
| Cost item | Amount |
|---|---|
| Construction cost | £40,000 |
| Architect fee (10% × £40k × London 1.35 multiplier, medium complexity) | £5,400 |
| Structural engineer (steel work, ridge beam, floor structure) | £1,400 |
| Planning application (householder) | £206 |
| Planning consultant (London pre-app advice) | £800 |
| Building Control | £800 |
| Party wall (2 neighbours, formal awards) | £2,200 |
| SAP energy assessment | £250 |
| Total professional fees | £11,056 |
| Professional fees as % of construction | 27.6% |
| Total project cost | £51,056 |
The London 35% premium plus the need for planning consultant and formal party wall awards drives the high professional fee ratio. Without the planning consultant and with simpler party wall arrangements, the ratio drops to about 22%.
Worked example 3: £150,000 full house refurbishment + extension
A comprehensive refurbishment of a 1930s semi-detached house in Bristol: new kitchen-diner extension (£50k), full re-wire and re-plumb (£25k), structural alterations and new staircase (£20k), new bathrooms and fittings (£25k), internal redecoration and flooring (£15k), exterior works including drives and rear garden (£15k). Total construction £150,000.
| Cost item | Amount |
|---|---|
| Construction cost | £150,000 |
| Architect fee (12% × £150k, medium-complex full refurb) | £18,000 |
| Structural engineer (multiple steel work, staircase calc) | £2,200 |
| Planning application (householder + Conservation Area) | £406 |
| Pre-app advice (regulated) | £300 |
| Building Control plus enhanced inspection (Approved Inspector) | £1,500 |
| Party wall (3 neighbours, full awards on shared boundaries) | £3,500 |
| Quantity surveyor (cost plan for £150k+ project) | £2,800 |
| M&E consultant (heating/electrical strategy) | £1,800 |
| SAP and energy assessor | £400 |
| Total professional fees | £30,906 |
| Professional fees as % of construction | 20.6% |
| Total project cost | £180,906 |
At this scale, the cost-benefit case for full-service architect plus QS is strong. The QS alone typically identifies £4,000-£8,000 of value engineering opportunities — covering their own fee multiple times.
Ancillary professionals — who you need and what they cost
The architect leads but a typical UK residential project requires 2-6 additional professional appointments:
Structural engineer
Required for any project involving load-bearing structure changes: steel beams over openings, removed walls, foundation modifications, floor structure changes, roof structure modifications. Registered with IStructE (Institution of Structural Engineers, istructe.org) or ICE (Institution of Civil Engineers, ice.org.uk). Fees:
- Simple loft conversion or single-storey extension: £500-£1,200
- Side-return/wrap-around extension: £1,200-£2,500
- Basement conversion: £2,000-£5,000
- New build house: £2,500-£8,000
- Listed/heritage interventions: £2,500-£8,000
Quantity surveyor (QS)
Recommended for any project over £100,000. The QS produces an independent cost plan, validates contractor tender pricing, and tracks variations during construction. RICS-qualified at rics.org. Fees: 1.5-3% of construction cost.
Mechanical and Electrical (M&E) consultant
For projects involving significant heating, electrical, ventilation or AV systems. Fees: 1-2.5% of construction cost. CIBSE-qualified at cibse.org.
Party wall surveyor
Required by the Party Wall etc. Act 1996 if your works affect a shared/boundary wall or involve excavation within 3-6m of a neighbour's property. Fees:
- Party wall notices: £150-£400 per neighbour
- Full Party Wall Award: £750-£2,500 per affected boundary
- Disputed awards: £3,000-£8,000
FPWS (Faculty of Party Wall Surveyors) at fpws.org.uk maintains a register.
Heritage/Conservation consultant
Required for Listed Buildings, properties in Conservation Areas, and Article 4 areas. Heritage statement preparation £600-£2,500. Specialist heritage architect £150-£300/hour.
Ecological surveyor
Required where the site has potential bat roosts, nesting birds, badger setts or protected species (Wildlife and Countryside Act 1981, Conservation of Habitats and Species Regulations 2017). Phase 1 ecological survey £400-£1,200; bat survey (3 visits at dusk/dawn during May-September) £1,500-£3,500.
Tree surveyor (Arboriculturist)
Required where construction is near significant trees, especially trees with Tree Preservation Orders (TPOs) or in Conservation Areas. BS5837 tree survey £600-£2,000. AAIS-qualified at the Arboricultural Association.
SAP/Energy assessor
SAP (Standard Assessment Procedure) calculation for new dwellings and material extensions, required by Building Regulations Part L. Fees: £150-£400. Approved by competent person scheme like Elmhurst Energy.
Planning permission and building control fees in detail
Planning fees (England, set by The Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) Regulations 2012 as amended)
| Application type | Fee |
|---|---|
| Householder application (extension, loft, garage) | £206 |
| Full planning — single new dwelling | £580 |
| Outline planning — single new dwelling | £580 |
| Change of use (residential) | £206 |
| Lawful Development Certificate (existing or proposed) | £103-£206 |
| Listed Building Consent | £0 (no fee, but more rigorous) |
| Conservation Area Consent (demolition) | £0 (within Listed Building Consent regime) |
| Advertising consent | £165 |
| Discharge of planning condition | £43-£145 each |
| Pre-application advice (varies by council) | £100-£500 |
Welsh, Scottish and Northern Irish authorities have separate fee schedules. Source: gov.uk/planning-permission-england-wales.
Building control fees
Building control fees scale with construction cost. Typical 2026 LABC fees:
| Construction cost | Plan fee | Inspection fee | Total |
|---|---|---|---|
| Up to £20,000 | £200-£280 | £300-£500 | £500-£780 |
| £20,001-£50,000 | £250-£380 | £500-£800 | £750-£1,180 |
| £50,001-£100,000 | £300-£500 | £700-£1,200 | £1,000-£1,700 |
| £100,001-£200,000 | £500-£800 | £1,200-£2,000 | £1,700-£2,800 |
| £200,001+ | 0.6-1.2% of construction | 0.4-0.8% of construction | 1.0-2.0% of construction |
Approved Inspector route (private alternative to council) is typically 10-25% cheaper. Many architects have working relationships with specific Approved Inspectors. Compare both before committing.
How to find and appoint a UK architect
Five steps to confidently appoint:
- Confirm ARB registration. The Architects Registration Board (ARB) is the statutory regulator under the Architects Act 1997. Only ARB-registered individuals can use the title 'architect'. Check the Register at arb.org.uk/architect-search. Look for: practising status, registration number, any disciplinary findings. Anyone designing your project without ARB registration is using the title 'architect' illegally (technically committing a criminal offence) and should be avoided.
- Look for RIBA Chartered status. RIBA Chartered Architects (post-nominal 'RIBA') meet additional CPD and conduct standards. Search the RIBA 'Find an Architect' tool at architecture.com/find-an-architect.
- Review portfolio for similar projects. An architect specialising in commercial new-builds may not be the ideal choice for a Victorian extension. Ask to see 3-5 completed projects similar to yours. Most practices will arrange visits to completed homes.
- Get 2-3 written fee proposals. Each proposal should specify: RIBA stages covered, deliverables, exclusions, fee structure (percentage / fixed / hourly), payment milestones, cap if applicable, contract terms (typically RIBA Standard Contract or RIBA Domestic Standard Project Agreement). Never engage based on a verbal estimate.
- Check professional indemnity insurance. All ARB-registered architects must hold PII (Professional Indemnity Insurance). Ask for the policy summary — typical levels are £250k for very small practices to £5m+ for larger projects. Your project sum should be well within the PII cover.
Red flags
- Cannot or will not show the ARB registration number
- Refuses to use the RIBA Standard Contract or RIBA Domestic Standard Project Agreement
- Asks for large upfront payments before any deliverable
- Cannot produce written portfolio or reference contacts
- Quotes a percentage fee far below the typical band (e.g. 3% on residential — likely a draftsperson, not an architect)
- Pressures for quick commitment without time to compare offers
What an architect contract should include
The RIBA Domestic Standard Project Agreement (DSPA) is the most common UK domestic architect contract — simple, clear, and used by tens of thousands of households every year. For larger or commercial projects, the RIBA Standard Professional Services Contract (PSC) is used. Either contract should include:
- Defined scope. RIBA stages covered, deliverables, exclusions. 'Exclusions' is critical — if structural engineering is not included, state so explicitly.
- Fee basis. Percentage, fixed fee, or hourly. If percentage, the basis (final construction cost? tender price?). If hourly, the hourly rate AND a cap.
- Payment terms. Stage-based milestones for percentage fees; monthly billing for hourly; per-stage for fixed.
- Termination provisions. Notice period, fees due on termination, what happens to deliverables.
- Copyright and licence. Architect retains design copyright; client receives a licence to construct. Standard terms in DSPA/PSC.
- Professional Indemnity Insurance level. Stated in the contract.
- Variation procedure. How additional work outside the agreed scope is charged.
- Dispute resolution. Mediation first; then RIBA-administered adjudication or court if unresolved.
Frequently asked questions
How much do architects charge in the UK in 2026?
5-15% of construction cost typically (most residential 8-12%). Fixed fee, percentage and hourly are the three main structures. Extension £20k → £2,000; loft £40k → £3,200-£5,400 (London); refurb £150k → £15,000-£18,000.
What is RIBA Plan of Work and how do fees relate to it?
8-stage UK construction process framework (Stages 0-7) published by RIBA. Fees apportioned across stages: 0-1 briefing 5-10%, 2 concept 15-20%, 3 spatial 15-20%, 4 technical 25-30%, 5 construction admin 20-30%, 6-7 handover 5%.
What is the difference between ARB and RIBA?
ARB is the UK statutory regulator (Architects Act 1997) — only ARB-registered can use the title 'architect'. RIBA is the voluntary professional body for Chartered Architects with additional CPD requirements.
What does an architect actually do?
40-60 distinct tasks across RIBA stages: surveys, brief development, design options, planning permission, building regulations drawings, technical specifications, contractor tender, 8-15 site visits, certified valuations, snagging, handover.
How much does a structural engineer cost?
Simple loft/extension £500-£1,200; complex extension £1,200-£2,500; basement £2,000-£5,000; new build £2,500-£8,000. Regulated by IStructE/ICE.
Cost of planning permission?
Householder application £206; new dwelling £580; LDC £103-£206. Welsh/Scottish/NI rates differ. Add planning consultant £500-£2,000 and pre-app advice £100-£500.
Cost of UK building control?
LABC: £400-£1,200 for typical extension/loft, scaling with works cost. Approved Inspector 10-25% cheaper. Higher-risk buildings (HRBs) under Building Safety Regulator separately.
Are architect fees negotiable?
Yes. Lever: reduce service scope (drop Stage 5), combine projects, off-peak commissioning, use smaller practice, use Part 2 architect for non-critical work. Always get 3 written proposals.
Architect vs architectural technologist?
Architect ARB-registered (7 years training); Technologist CIAT-registered (MCIAT). Technologists charge 60-80% of architects but less conceptual design depth. Both can submit planning/building control.
How to find a good UK architect?
(1) Check ARB Register; (2) Look for RIBA Chartered status; (3) Review similar-project portfolio; (4) Get 3 written fee proposals on RIBA contract; (5) Check PII level.
Party Wall Agreement cost?
Notices £150-£400 per neighbour; full Award £750-£2,500 per boundary; disputes £3,000-£8,000. Applicant pays both sides' surveyors. FPWS register.
When do I not need planning permission?
Permitted Development Rights under Town and Country Planning (General Permitted Development) Order 2015. Apply for LDC (£103) for legal certainty. NO PDR for flats, listed buildings, or properties in Conservation Areas with Article 4 directions.
How long does an architect-led project take?
9-18 months brief to completion. Indicative: brief 2-4wk; concept 4-8wk; planning 12-19wk (incl 8-13wk council); technical 6-10wk; tender 4-6wk; construction 12-26wk (extension) to 30+wk (new build); handover 2-4wk.
Architect or builder-designer?
Architect for non-trivial projects (£50k+). Builder-designer 30-50% cheaper but you lose independent design oversight, PII, planning/building control expertise, and contractual protection. Under £20k builder-designer can be acceptable.
Glossary
- ARB: Architects Registration Board, UK statutory regulator under Architects Act 1997.
- Article 4 Direction: Local planning authority direction removing permitted development rights in specific areas (typically conservation areas).
- BSR: Building Safety Regulator, established under Building Safety Act 2022 for higher-risk buildings.
- CIAT: Chartered Institute of Architectural Technologists.
- CIBSE: Chartered Institution of Building Services Engineers (M&E professionals).
- CDM Regulations: Construction (Design and Management) Regulations 2015, requiring health and safety roles on projects.
- DSPA: RIBA Domestic Standard Project Agreement, the common UK domestic architect contract.
- FPWS: Faculty of Party Wall Surveyors.
- HRB: Higher-Risk Building, defined under Building Safety Act 2022 (18m+ or 7 storeys).
- ICE: Institution of Civil Engineers.
- IStructE: Institution of Structural Engineers.
- LABC: Local Authority Building Control.
- LDC: Lawful Development Certificate.
- PDR: Permitted Development Rights, set out in Town and Country Planning (General Permitted Development) (England) Order 2015.
- PII: Professional Indemnity Insurance.
- QS: Quantity Surveyor, RICS-qualified cost professional.
- RIBA: Royal Institute of British Architects, professional body.
- RIBA Plan of Work: 8-stage UK construction process framework (2020 edition current).
- RICS: Royal Institution of Chartered Surveyors.
- SAP: Standard Assessment Procedure (Building Regulations Part L energy performance).
- TPO: Tree Preservation Order.
Related calculators on UK Calculator
Official UK Sources
- RIBA — Royal Institute of British Architects
- ARB — Architects Registration Board (statutory regulator)
- RICS — Royal Institution of Chartered Surveyors
- IStructE — Institution of Structural Engineers
- ICE — Institution of Civil Engineers
- CIAT — Chartered Institute of Architectural Technologists
- CIBSE — Chartered Institution of Building Services Engineers
- GOV.UK — Planning permission England & Wales
- GOV.UK — Permitted development rights
- Planning Portal — UK planning system guidance
- FPWS — Faculty of Party Wall Surveyors
- Party Wall etc. Act 1996
Calculator verified against the RIBA Plan of Work 2020, ARB Architects Code of Conduct and Practice, the Town and Country Planning (Fees) Regulations 2012 (as amended), the Town and Country Planning (General Permitted Development) (England) Order 2015, Party Wall etc. Act 1996, and the Building Regulations 2010. Last reviewed: 25 May 2026. This page is for general guidance only and is not regulated architectural, engineering or legal advice. Always engage an ARB-registered architect under a written contract (RIBA DSPA or PSC) and obtain quotes from at least three practices before committing.
About this calculator
Last updated 25 May 2026 by Mustafa Bilgic, independent operator of UK Calculator (Adıyaman, Turkey — see About). Figures cross-checked against the RIBA Plan of Work 2020, ARB Architects Code, the Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) Regulations 2012 as amended, the Building Act 1984, Building Regulations 2010, Party Wall etc. Act 1996, and published fee proposals from a sample of UK architectural practices ranging from sole practitioners to top-50 RIBA Chartered Practices. This is general information only and does not constitute regulated professional advice. Always engage an ARB-registered architect under a written RIBA Standard Contract (DSPA for domestic, PSC for commercial) and obtain fee proposals from at least three practices before committing to any project.