Self-building your own home is one of the most demanding but potentially most rewarding projects a homeowner can undertake. The main barrier for most people isn't ambition: it's finance. Conventional mortgages don't work for self-builds because there's no existing property for a lender to secure against while you're building. This is where the Help to Build scheme and specialist self-build finance come in.
The Help to Build Equity Loan
Help to Build is a government-backed equity loan scheme for self-builders in England, broadly modelled on Help to Buy. The government provides an equity loan of 5-20% (up to 40% in London) of the total estimated cost of land and build, which reduces the deposit you need to secure a self-build mortgage.
You need a minimum 5% deposit. The equity loan is interest-free for the first five years. After that, interest accrues at 1.75% in year six, rising annually by the Consumer Price Index plus 2%. The loan is repaid when you sell the property or pay it off separately.
The total cost (land plus build) must not exceed £600,000. The property must be your primary residence. You cannot own another home at the time of the loan completion.
Eligibility and Application
To apply for Help to Build, you'll need to submit an application through the government portal before your build starts. You'll need planning permission for the build, confirmation of your self-build mortgage in principle, and a detailed build cost assessment from a quantity surveyor or architect.
The scheme is administered by Homes England (in England). Similar schemes exist in Scotland, Wales and Northern Ireland under different names and with different terms: the Help to Build: Self and Custom Build scheme in Wales, and the Custom Build Incentive Fund in Scotland. Check the current status of each scheme before relying on it, as availability and terms have changed several times since these programmes launched.
Self-Build Mortgages
Even with a Help to Build equity loan, you'll need a self-build mortgage for the bulk of the finance. Self-build mortgages work differently from conventional mortgages: instead of releasing the money in one lump sum, lenders release it in stages as the build progresses, based on either an arrears or advance release model.
Arrears stage release means the lender releases funds after each stage is completed and verified. This protects the lender but can cause cash flow problems if you need to pay contractors before a stage is signed off.
Advance stage release means funds are released before each stage begins. This is more expensive (higher interest rates) but much better for cash flow management on site.
Lenders offering self-build mortgages include Buildstore, Ecology Building Society, Nationwide and a number of smaller specialist lenders. Rates are generally higher than standard mortgages, and the valuation and draw-down process is more intensive.
VAT Reclaim for Self-Builders
This is one of the most significant financial benefits of self-building, and it's genuinely underutilised because people don't know about it. Under HMRC's DIY Housebuilders Scheme, you can reclaim VAT paid on building materials for a new residential property, even if you're not VAT registered. The VAT on a typical self-build can amount to £20,000-£40,000 or more.
The reclaim process has strict requirements: you must keep all receipts, the reclaim must be submitted within three months of the building regulation completion certificate being issued, and it can only be done once. Errors are expensive. Many self-builders use an accountant with experience in construction VAT to handle this.
Keep every receipt from day one. VAT reclaim on a self-build is not complicated in principle but it is unforgiving about documentation. A missing receipt for a major materials purchase can cost you significantly at claim time.
Custom Build vs Full Self-Build
There's an important distinction between full self-build (where you manage the entire construction process yourself, using your own contractors) and custom build (where you purchase a serviced plot from a developer or custom build enabler, who manages infrastructure and may provide a shell building that you complete).
Custom build removes much of the complexity of finding land, managing planning, organising utilities and overseeing groundworks. In return, it generally costs more and offers less design freedom. For someone wanting their own home but intimidated by the full self-build process, it's a worthwhile middle ground.
Several local authorities have custom build registers where you can express interest in plots. Under the Self-Build and Custom Housebuilding Act 2015, local authorities must keep these registers and are obliged to grant planning permission for enough self and custom build plots to meet demand on the register. In practice, this obligation is imperfectly enforced, but being on the register keeps you informed of opportunities.