Free House Build Cost Calculator

Cost to Build a House UK 2026: Complete Breakdown

Q: How much does a self build cost per square metre in the UK?

In 2026, self build costs typically range from £2,300 to £3,600+ per square metre depending on specification. Basic specification costs around £2,300/m² with standard finishes and basic systems. Standard specification costs around £2,900/m² with good quality finishes and modern systems. High specification costs £3,600/m² or more with premium finishes and high-end features. These figures are for the build only and exclude plot costs, professional fees, VAT and other project expenses.

Q: How accurate is this self build cost calculator?

Our calculator provides order-of-magnitude estimates based on current UK market rates. Accuracy depends on how well you know your specification requirements, local market conditions and contractor availability, site-specific challenges, and timing of your build. Always get detailed quotes from contractors and professionals for accurate pricing.

Q: Do I need to pay VAT on my self build?

VAT treatment depends on your approach. Main contractor builds have 0% VAT if contractor is VAT-registered and supplies materials. DIY self builds can reclaim VAT on materials but pay 20% on labour. Professional fees have standard 20% VAT. Conversions and renovations have 20% VAT on labour with reduced rates potentially applying to materials.

Q: What professional fees should I budget for?

Professional fees typically account for 10-15% of your total build cost. This includes architect fees (8-15% of build cost), structural engineer (1-3%), quantity surveyor (1-2%), and planning consultant (£2,000-£10,000+ if required).

Q: How much contingency should I include?

We recommend a minimum 10-15% contingency on your total project cost. Experienced self-builders should budget 10-12%, first-time self-builders 15-20%, complex or rural sites 20%+, and listed buildings/conversions 25%+. Contingency covers unforeseen costs, specification changes, and market fluctuations.

Q: What are the main cost differences between regions in the UK?

Build costs vary significantly by region. London & South East are +20-40% above national average, South West popular rural areas +10-20%, Midlands close to national average, Northern England -10-20% below average, Scotland -5-15% below average, Wales -5-15% below average, and Northern Ireland -15-25% below average. Rural locations may have higher costs due to transport and contractor availability.

Q: How long does a self build take and how does this affect costs?

Typical self build timelines include planning & design (6-12 months), construction (10-16 months for typical homes), with total project time of 18-30 months from start to completion. Longer builds increase finance costs and may be subject to material price inflation. Weather delays, planning complications, and specification changes can extend timelines.

UK house build costs range from £2,300 to £3,600+ per m² in 2026 — covering self build and custom build. Get the complete breakdown of professional fees, utilities, VAT, and regional variations.

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Instant estimates

Based on UK cost data

Quick Cost Estimate

Get an instant estimate with just 3 inputs

Floor area (m²)

Specification

£2,900/m²

Region

×1.00 multiplier

Estimated Build Cost

£435,000

150 m² × £2,900/m² × 1.00

Total Project Cost

£584,240

Includes fees, surveys, utilities & contingency

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Detailed Cost Breakdown & Advanced Options

Customize all assumptions, add surveys, utilities, and get a comprehensive breakdown of your self-build budget.

Project name

Region multiplier (override)

Leave empty to use region default (×1.00). Set a custom value to override.

Plot price (optional)

Build cost

£435,000

150 m² × £2,900/m² × 1.00 region

External works

£52,200

12% of build

Professional fees

£65,250

15% of build

Statutory fees

£2,560

Planning £610, Pre‑app £450, Building control £1,500

Surveys

£5,050

4 items

Utilities & setup

£9,150

5 items

Insurance & warranty

£4,700

2 items

CIL

£0

Self‑build exemption applied

Finance interest (est)

£10,330

60% financed · APR 6.0% · 12 months

VAT on works (est)

£0

Zero‑rated new build

VAT/Other allowance

£0

Manual allowance for irrecoverable VAT/IPT

Subtotal (excl. plot)

£584,240

Surveys & Reports

4 items selected

£5,050

Utilities & Site Setup

5 items selected

£9,150

Insurance & Warranty

2 items selected

£4,700

Statutory Fees, VAT & CIL

Planning £610, Building control £1,500

£2,560

Planning application fee

England (1 Apr 2026): £610 per dwelling (full app, up to 10 dwellings).

Pre‑application advice

Building control fee

New build with zero‑rated main contract (VAT)

If unchecked, 20% VAT will be applied to build + externals.

Irrecoverable VAT/Other allowance

Catch‑all for VAT on fees, insurance taxes, etc.

Self‑build CIL exemption

Submit forms before commencement.

Finance Options

60% financed · APR 6.0% · 12 months

£10,330

% of costs financed

60%

Interest rate (APR)

Build duration

months

Plot, Taxes & Legals

Plot £150,000, Tax £0, Legal £1,800

£151,800

Plot price

Transaction type

Land only Residential

Conveyancing & legals

Stamp Duty / LBTT / LTT

£0

England · land

Grand total (incl. plot & taxes)

£736,040

Important Considerations

✓ Party Wall notices
✓ Access & driveway
✓ Landscaping & boundaries
✓ Kitchen & bathroom allowances
✓ Renewables & grants
✓ MVHR & airtightness
✓ Temporary accommodation
✓ Running costs

⚠️

Estimates only. Costs vary hugely by site, timing and local market conditions. Always get quotes and verify tax/planning details with official sources.

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Frequently Asked Questions About UK House Build Costs

How much does a self build cost per square metre in the UK?

In 2026, self build costs typically range from £2,300 to £3,600+ per square metre depending on specification:

Basic specification: £2,300/m² - Standard finishes, basic systems
Standard specification: £2,900/m² - Good quality finishes, modern systems
High specification: £3,600/m² - Premium finishes, high-end features

These figures are for the build only and exclude plot costs, professional fees, VAT and other project expenses.

What is the total cost of a self build project including all expenses?

For a complete self build project, expect to budget approximately 1.5-2x the basic build cost to cover all expenses:

Build cost: 60-70% of total project
Professional fees: 10-15%
External works: 8-12%
Surveys, utilities, fees: 5-10%
Contingency: 10-15%

Plus plot cost and associated purchase taxes (SDLT/LBTT/LTT).

How accurate is this self build cost calculator?

Our calculator provides order-of-magnitude estimates based on current UK market rates. Accuracy depends on:

How well you know your specification requirements
Local market conditions and contractor availability
Site-specific challenges (access, ground conditions, utilities)
Timing of your build (material costs fluctuate)

Always get detailed quotes from contractors and professionals for accurate pricing.

Do I need to pay VAT on my self build?

VAT treatment depends on your approach:

Main contractor build: 0% VAT if contractor is VAT-registered and supplies materials
DIY self build: You can reclaim VAT on materials but pay 20% on labour
Professional fees: Standard 20% VAT applies
Conversions/renovations: 20% VAT on labour, reduced rates may apply to materials

What professional fees should I budget for?

Professional fees typically account for 10-15% of your total build cost:

Architect: 8-15% of build cost (depending on service level)
Structural engineer: 1-3% of build cost
Quantity surveyor: 1-2% of build cost (cost control)
Planning consultant: £2,000-£10,000+ (if required)

How much contingency should I include?

We recommend a minimum 10-15% contingency on your total project cost:

Experienced self-builders: 10-12% contingency
First-time self-builders: 15-20% contingency
Complex or rural sites: 20%+ contingency
Listed buildings/conversions: 25%+ contingency

Contingency covers unforeseen costs, specification changes, and market fluctuations.

What are the main cost differences between regions in the UK?

Build costs vary significantly by region:

London & South East: +20-40% above national average
South West (popular rural areas): +10-20%
Midlands: Close to national average
Northern England: -10-20% below average
Scotland: -5-15% below average (varies by area)
Wales: -5-15% below average (varies by area)
Northern Ireland: -15-25% below average

Rural locations may have higher costs due to transport and contractor availability.

How long does a self build take and how does this affect costs?

Typical self build timelines:

Planning & design: 6-12 months
Construction: 10-16 months for typical homes
Total project: 18-30 months from start to completion

Longer builds increase finance costs and may be subject to material price inflation. Weather delays, planning complications, and specification changes can extend timelines.

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This tool provides order‑of‑magnitude estimates for UK self‑builds. Always get itemised quotes. Planning fees, tax and grants change periodically; check your local authority and GOV.UK.