Essex has a long tradition of self-build — particularly around Brentwood and the surrounding villages, where individually designed homes and one-off plots sit alongside the more standard housing stock. If you're thinking about building your own home rather than buying one, the mortgage side of things works quite differently to a normal purchase, and it's worth understanding the basics before you get too far into planning.
It's not a normal mortgage
The biggest difference is timing. With a standard mortgage, you get the full loan amount on completion. With a self-build mortgage, funds are released in stages as the build progresses — land purchase, foundations, walls up to roof height, roof on and watertight, first fix, and final completion. A surveyor typically values the property at each stage before the next tranche is released.
Most lenders work on an arrears basis — you fund each stage yourself and get reimbursed once it's complete. A smaller number of specialist lenders offer advance payments, releasing funds at the start of each stage, which helps significantly with cash flow but narrows your choice of lender.
What deposit do you need?
Typically around 25% of the total project cost — land plus build costs combined. This is higher than a standard residential mortgage, but there's a detail that often gets missed: if you already own the land outright, its value usually counts towards that deposit.
Land value (already owned, no mortgage): £180,000
Estimated build cost: £320,000
Total project cost: £500,000
Required deposit (25%): £125,000
In this scenario, the land value of £180,000 already exceeds the required deposit — meaning the build itself could potentially be funded entirely through the staged mortgage, subject to lender criteria and a full assessment.
This is exactly why self-build is often more achievable than people initially think — particularly for anyone who's inherited land, or bought a plot some years ago and is only now getting round to building on it.
You don't need to be a builder
A common misconception is that you need construction experience to get a self-build mortgage. You don't — what lenders actually want is confidence that the build will be professionally managed. That usually means one of:
- A main contractor working on a fixed-price or cost-plus basis
- An architect or project manager overseeing the build
- A self-build package company handling design and construction together
If you're planning to manage the project entirely yourself with no professional oversight, it's still possible with some lenders, but the options narrow and you'll likely be asked more detailed questions about your plan.
Budget for more than you think
Running over budget is probably the most common issue we see with self-build projects — ground conditions, material costs, and mid-build design changes all add up. Building in a contingency of 10–15% on top of your estimated costs is sensible, both for your own financial comfort and because lenders increasingly expect to see this factored into your figures upfront.
It's worth asking your lender in advance what happens if costs increase mid-build. Some are considerably more flexible than others about adjusting the facility, and finding this out before you start is far better than discovering it partway through.
Building in Brentwood and the surrounding area
Brentwood and its outlying villages — Shenfield, Hutton, Ingatestone, Kelvedon Hatch and others — have a strong tradition of individually designed homes and private plots, more so than many parts of Essex. If you're building in this area, it's worth reading our Brentwood mortgage broker page for more on the local market.
If your project is larger — multiple units, a significant conversion, or commercial development — that typically falls under development finance rather than a standard self-build mortgage, and the lending structure is a bit different again.
Thinking about building your own home? We'll talk you through the staged drawdown process and find the right specialist lender for your project. Call us on 01277 564 054 or send a message.
Talk to an AdviserFAQs
It's different rather than harder. Self-build mortgages work with a smaller pool of specialist lenders than standard residential mortgages, and the application process takes a bit more planning. But for the right project with the right preparation, it's very achievable.
In many cases, yes. If you own the land outright, its value can often count towards your required deposit, which typically needs to represent around 25% of the total project cost. This makes self-build more accessible than people often assume if you already have a plot.
It varies depending on the lender and complexity of the project, but allow more time than a standard purchase. Planning permission, a detailed cost breakdown, and confirmation of how the build will be managed are all typically required before an application can proceed.
Typically planning permission or outline consent, a detailed build cost breakdown, architect's drawings, details of your contractor or project manager, and evidence of how the land is owned or being purchased. Requirements vary by lender.