Self Build Mortgage | Specialist Self Build Mortgage Broker

If you’re planning to build your own home, you’ll need a self build mortgage rather than a standard residential one. At Trinity Finance, our experienced brokers specialise in arranging tailored self build finance — helping you fund each stage of your build smoothly and efficiently.

What is a Self Build Mortgage?

A self build mortgage is designed for people who are constructing their own property from the ground up, converting a building, or carrying out a major renovation. Unlike a traditional mortgage where funds are released in one lump sum, a self build mortgage releases money in stages — typically at key phases such as land purchase, foundations, wall plate, roof, and completion.

This structure helps lenders manage risk while giving you access to funds as your build progresses.

Type	Description	Best For
Arrears-Based	Funds released after each stage’s inspection.	Clients with savings or additional funds.
Advance-Based	Funds released before each stage begins.	Clients who need upfront cash flow.
Cost-Based / Value-Based	Borrowing based on project cost or end value.	Depends on build type and lender criteria.

Some lenders also allow interest-only payments during the build to keep monthly costs manageable until completion.

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Eligibility and Lending Criteria

Every lender has its own criteria, but the main factors include:

Deposit / equity: Typically between 25%–40%, depending on project and lender.
Land ownership: You can fund both the land purchase and build cost.
Experience: First-time builders are accepted, but you’ll need detailed plans and professional support.
Income & affordability: Full income verification required; self-employed applicants welcome.
Planning permission: Full planning permission must be in place before funds are released.
Construction type: Traditional brick/block builds are widely accepted; timber frame and modular builds assessed individually.

Our advisers understand each lender’s appetite and criteria — so we match your project with the right lender from day one.

How Much Can You Borrow?

Most lenders will allow you to borrow up to:

75% of land purchase costs, and
85% of build costs,
or around 60%–80% of the total project cost depending on the lender, stage payments, and your experience.

We’ll calculate how much you can borrow based on your build costs, site value, and expected final valuation — ensuring your finances stay on track from start to finish.

Self Build Mortgages for the Self-Employed

Being self-employed doesn’t mean you can’t get a self build mortgage. Many of our clients are contractors, company directors, or freelancers with complex income structures. We work with specialist lenders who manually underwrite — meaning they look beyond basic payslips and focus on the true affordability of your project.

If you’re self-employed, we’ll help you present your accounts, SA302s, or accountant’s reference in the best way possible to secure approval.

Risks, Pitfalls, and How to Avoid Them

Self builds can be extremely rewarding, but they come with challenges. Common pitfalls include:

Underestimating build costs or contingency
Running out of funds mid-project
Delays with inspections or stage releases
Choosing an unsuitable builder or project manager

Our brokers can help you plan ahead — ensuring stage payments align with your contractor’s schedule, your lender’s policy, and your cash flow.

Remortgaging or Switching to a Standard Mortgage

Once your home is complete and signed off with a Building Completion Certificate, you can usually switch to a standard residential mortgage. This often gives you access to lower rates.

We’ll guide you through that transition — arranging your exit remortgage and ensuring you get the most competitive long-term deal.

FAQs

What deposit do I need for a self build mortgage?

Most lenders require between 25% and 40% of the overall project cost, although some may go lower if you already own the land outright.

Do I need planning permission before applying?

Yes, lenders require full planning permission before funds are released.

Can I get a self build mortgage if I already own the land?

Absolutely. You can use the land’s value as your deposit or equity contribution.

How are funds released during the build?

Funds are released in 4–6 stages, either in arrears or advance of the work — depending on your lender.

Can I live in another property while building?

Yes, and in some cases, you can use bridging finance or a let-to-buy arrangement to maintain flexibility.

What happens if my build costs change?

You’ll need to notify your lender and broker — sometimes stage releases can be adjusted, but we’ll help manage any variations.

How long does a self build mortgage take to arrange?

It typically takes 4–8 weeks from application to approval, depending on lender and documentation.

Can I include fees, materials, or contingency funds?

Most lenders allow you to borrow against approved build costs; your broker will confirm what’s acceptable.

What if my property value is higher than expected on completion?

You may be able to refinance at a lower loan-to-value, unlocking better rates and freeing up equity.

Can I get a self build mortgage through my limited company?

Yes — certain lenders offer self build mortgages through SPVs or limited companies. Our advisers can help structure this correctly.

Speak to an expert Self-Build Mortgage adviser from Trinity Finance

Our specialist Self-Build mortgage brokers are here to guide you through the entire mortgage and finance process, helping you secure the best Self-Build mortgage deal tailored to your needs.