How much does it cost to build your own house in the UK?

The average cost to build a house in the UK is £1,500–£3,000 per square metre depending on specification and location (excluding land). For a typical 3-bedroom house (around 100–120 sqm), build costs range from £150,000–£360,000. On top of this, you need to buy land (hugely variable — from £50,000 in rural areas to £500,000+ in the South East), pay for professional fees (architect, structural engineer — typically 10–15% of build cost), and cover planning and building regulations fees.

How do self-build mortgages work?

Self-build mortgages release funds in stages as the build progresses rather than as a single lump sum. Stages typically include: land purchase, foundations, wall plate (walls up), wind and watertight (roof on), first fix (plumbing, electrics), second fix (kitchens, bathrooms), and completion. There are two types: arrears-stage mortgages (money after each stage is complete — cheaper but you need cash upfront for each stage) and advance-stage mortgages (money at the START of each stage — more expensive but no cash needed upfront). Deposits are typically 15–25% of the total project cost.

Do I need planning permission for a self-build?

Yes — almost all new-build houses require planning permission from your local council. There are a few exceptions (e.g. some conversions under permitted development), but building a new house on a plot will require a full planning application. You can apply for outline planning permission first (to establish the principle of building) and then detailed/full planning permission. Having a plot with existing planning permission is the lowest-risk approach.

Can I reclaim VAT on a self-build?

Yes — self-builders can reclaim VAT on the majority of building materials and some contractor costs for a new-build house. You submit a single VAT reclaim to HMRC (form VAT431NB) within 3 months of the build completing (though HMRC usually allows an extension if you contact them). You can only claim for a NEW build (not renovations or extensions). Keep all VAT invoices carefully — you'll need them for the claim. The reclaim can be worth thousands of pounds.

Self-Build House Guide UK — Planning, Costs & Mortgages

Building your own home gives you complete control over design, layout, and specification. Here’s everything you need to know about self-building in the UK.

Self-Build Overview

Feature	Detail
Average build cost (excl. land)	£1,500–£3,000/sqm depending on spec
Average UK self-builds per year	~12,000–15,000
Typical build time	12–24 months (after planning)
VAT reclaim	Yes — on new builds
CIL exemption	Yes — self-builds exempt from Community Infrastructure Levy
Right to Build register	Local councils must keep a register of people wanting to self-build

Typical Costs

Build Cost per Square Metre

Specification	Cost/sqm	100 sqm house	150 sqm house	200 sqm house
Basic	£1,500–£1,800	£150,000–£180,000	£225,000–£270,000	£300,000–£360,000
Good	£1,800–£2,200	£180,000–£220,000	£270,000–£330,000	£360,000–£440,000
Excellent	£2,200–£2,800	£220,000–£280,000	£330,000–£420,000	£440,000–£560,000
Outstanding	£2,800–£3,500+	£280,000–£350,000+	£420,000–£525,000+	£560,000–£700,000+

Full Project Budget

Cost element	Typical range	Notes
Land	£50,000–£500,000+	Huge variation by area
Build costs	£150,000–£400,000	Based on size and spec
Professional fees (architect, engineer, project manager)	10–15% of build cost	£15,000–£60,000
Planning permission	£462 (current fee for a new dwelling)	Plus any pre-application advice
Building regulations	£500–£2,000	Depends on council and project size
Warranty (structural)	£1,500–£3,500	NHBC, LABC, Premier Guarantee, etc.
Site preparation	£5,000–£30,000	Demolition, access, services
Utilities connections	£5,000–£20,000	Water, electric, gas, drainage
Landscaping	£5,000–£30,000	Driveway, garden, fencing
Contingency (10–15%)	£15,000–£60,000	Essential — unexpected costs always arise
Total	£250,000–£1,000,000+	Depends on land, location, size, specification

Finding Land

Source	Detail
Plotfinder.net	Largest UK self-build plot database
Rightmove/Zoopla	Search for “land” or “building plot”
Local estate agents	Some specialise in land sales
Auction houses	Land plots often sold at auction
Local council Right to Build register	Register your interest — councils must provide plots
Direct approach	Identify potential plots and approach landowners directly
Local newspaper classifieds	Occasionally list plots

What to Check Before Buying Land

Check	Why
Planning history	Has planning been granted or refused before?
Title deeds and covenants	Any restrictions on building?
Access	Is there legal access to the plot?
Services	Are water, electricity, gas, drainage available or do they need connecting?
Ground conditions	Get a soil survey — bad ground can add £10,000+ to foundation costs
Flooding	Check the flood risk map
Trees	TPOs (Tree Preservation Orders) can restrict what you build and where
Contamination	Previous industrial use may mean costly remediation
Neighbours	Talk to them — any boundary disputes?

Planning Permission

Stage	Detail	Cost
Pre-application advice	Informal discussion with planning officer	£50–£600
Outline planning	Establishes the principle of building (not detailed design)	£462
Full/detailed planning	Detailed plans for assessment	£462
Decision time	Typically 8–13 weeks	—
Planning conditions	You’ll need to satisfy conditions before and during build	—

Self-Build Mortgages

Feature	Arrears stage	Advance stage
When funds released	After each stage is complete	Before each stage begins
Cash needed upfront	Yes — you fund each stage then get reimbursed	No — funds released to start each stage
Interest rate	Lower	Higher (typically 0.5–1% more)
Best for	Those with savings/cash reserves	Those who need funds to start each stage
Number of stages	4–6	4–6

Typical Release Stages

Stage	% of build cost released
Land purchase	Separate land mortgage or deposit
Foundations	15–20%
Wall plate (walls built to roof level)	15–20%
Wind and watertight (roof on)	15–20%
First fix (plumbing, electrics, plastering)	15–20%
Second fix (kitchens, bathrooms, finishing)	10–15%
Completion	Final release / retention

Self-Build Mortgage Lenders

Lender	Type	Notes
BuildStore	Broker/portal	Largest self-build specialist — access to multiple lenders
Ecology Building Society	Direct	Specialises in sustainable and self-build
Bath Building Society	Direct	Self-build and custom build mortgages
Furness Building Society	Direct	Self-build products
Mainstream lenders (e.g. Halifax, Nationwide)	Limited	Some offer self-build but criteria can be restrictive

Build Routes

Route	You manage	Cost	Control	Risk
DIY build	Everything yourself	Cheapest	Maximum	Highest (quality, time, safety)
Self-manage with subcontractors	You hire individual trades	Lower	High	Medium
Main contractor	One builder manages everything	Mid–higher	Medium	Lower
Project manager + subcontractors	PM manages trades for you	Higher (PM fees 10–15%)	Medium	Lower
Package/kit home supplier	Pre-designed home erected on your plot	Variable	Lower (limited design changes)	Lower
Turnkey	Developer does everything, you get a bespoke home	Highest	Lower	Lowest

VAT Reclaim

Detail	Information
Who can claim	DIY housebuilders building a new dwelling
What you can claim	VAT on building materials and some contractor services
When to claim	Within 3 months of completion (HMRC may extend if asked)
Form	VAT431NB (new build)
How much	Typically £5,000–£30,000+
What you need	All VAT invoices (must be in your name)
What you can’t claim	Professional fees (architect, engineer), tools and plant hire, furniture/soft furnishings

Insurance You Need

Insurance	When	Why
Site insurance	During construction	Covers theft, damage, public liability
Structural warranty	Before completion	Required by most mortgage lenders — 10 years
Self-build insurance	Throughout	Combines site insurance, employer’s liability, public liability
Buildings insurance	At completion	Standard home insurance

Useful Links

Your home may be repossessed if you do not keep up repayments on your mortgage. PocketWise provides information and guidance, not financial advice. Seek independent mortgage advice before making decisions about borrowing.