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.

Lee Oliver

Self-Build Mortgage Consultant

Louis Chalk

Self-Build Associate Director

Emma Taylor

Self-Build Mortgage Consultant

Call us: 01322 907 000

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Latest Testimonials

      EXCELLENT  
   Based on 568 reviews 
    
 
 
 
   
 
 
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   Kwik Prints & Repro 
 
 
 
 Trustindex verifies that the original source of the review is Google. I have known Vijay since his time at Lloyds Bank and have maintained that relationship over the years because of the trust and confidence I have always had in his knowledge, professionalism and approach.

Most recently, Vijay helped us with what was a particularly complex Buy-to-Let mortgage requirement. From the outset, he took the time to fully understand our circumstances and exactly what we were trying to achieve. His knowledge of the mortgage market and specialist property finance enabled him to navigate the complexities of the case and ultimately find the right solution for us.

What particularly stands out about Vijay is his attention to detail and his ability to genuinely listen to every requirement. He does not take a one-size-fits-all approach. He explains the options clearly, keeps you informed throughout the process and is extremely thorough in ensuring that every detail is dealt with correctly.

The service we received was brilliant from beginning to end, and it reinforced why I have continued to trust Vijay since first dealing with him at Lloyds many years ago.

I would also like to give a special mention to James for his exceptional administrative support throughout the process. His efficiency, communication and assistance behind the scenes were greatly appreciated and contributed enormously to the overall experience.

A genuinely professional and knowledgeable service. I would have no hesitation whatsoever in recommending Vijay to anyone looking for mortgage advice, particularly where the circumstances are more complex and require experience, patience and attention to detail.
  
 
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   Florina Petecuta 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a great experience with Trinity Finance and would highly recommend them.

Joe, my mortgage adviser, was amazing throughout the whole process. He was extremely knowledgeable, always quick to respond, and took the time to answer all my questions and explain everything clearly. He made the whole mortgage process feel much easier and less stressful.

I also had a great experience dealing with James and the rest of the team, who were always helpful and professional.

I decided to use the solicitors recommended by Trinity Finance as well, and I was very happy with them. They were knowledgeable and experienced, kept me informed throughout the process, and were always happy to answer my questions.

Overall, I had a really positive experience from start to finish and would definitely recommend Trinity Finance, and Joe in particular, to anyone looking for a mortgage adviser.
  
 
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   Charlie Watson 
 
 
 
 Trustindex verifies that the original source of the review is Google. We were lucky enough to have Alasdair guide us through the process of buying our first property. Could not recommend him enough. Explains everything clearly and simply, in a friendly manner that welcomes any questions.
  
 
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   Sonal Patel 
 
 
 
 Trustindex verifies that the original source of the review is Google. Louis goes above and beyond, exceptional service and I would definitely use him for all future purchases
  
 
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   David Raggett 
 
 
 
 Trustindex verifies that the original source of the review is Google. I recently worked with Lisa Ingram at trinity when going through the purchase of my first house. As a first time buyer doing it alone, I didn’t know where to begin and felt very lost by the whole process… but from my first conversation with Lisa I felt much more at ease.
She took the time to explain everything to me and looked at all different kinds of options.
Any time I messaged or needed to talk she’d always respond promptly or arrange a telephone call.
She was very professional and thorough and I really felt like she had my best interests at heart and wanted to get me the best possible deal.
From start to end she has been incredibly helpful and I can’t recommend her and trinity enough. 10/10 !!
  
 
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   harry yorke 
 
 
 
 Trustindex verifies that the original source of the review is Google. I can’t recommend Trinity Finance enough. They made the whole mortgage process so much easier and took the stress out of everything. The team were always on hand to answer my questions, kept me updated every step of the way, and worked hard to find me the best mortgage for my situation.

Their advice was clear, honest, and professional from start to finish. I always felt like they had my best interests at heart, and nothing was ever too much trouble.

If you’re looking for a mortgage broker  who genuinely cares Maria & Vince  goes the extra mile, I’d definitely recommend Trinity Finance. Thank you for all your help over the many years
  
 
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   Kishan Assani 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent service!. Faisal secured us a better rate than we could find ourselves and navigated two buy-to-let mortgages effortlessly. He went beyond just finding rates - he challenged our assumptions, explained the complexity, and genuinely cared about getting us the right deal. Highly recommended for property investors.
  
 
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   Gary Gray 
 
 
 
 Trustindex verifies that the original source of the review is Google. Nicola has been outstanding from start to finish, always willing to go the extra mile. She offered clear guidance at every step of the mortgage process and made what could have been a stressful experience feel smooth and manageable. Her support has been invaluable.

I’ve already recommended Trinity Finance to family and friends and will continue to do so.
  
 
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   Jessica Vohra 
 
 
 
 Trustindex verifies that the original source of the review is Google. I cannot recommend Bijal highly enough. From start to finish, she was incredibly helpful, professional, efficient and supportive throughout the entire mortgage process.

Thank you again for all your help! Appreciate your efforts!
  
 
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   G Zorlu 
 
 
 
 Trustindex verifies that the original source of the review is Google. Jordan was absolutely fantastic from start to finish. As a first-time flat buyer, the whole process could have been overwhelming, but Jordan made everything so straightforward and stress-free.

He was always on the ball, incredibly responsive, and kept me updated every step of the way. No question was ever too much trouble, and he was always happy to explain things clearly. His professionalism, knowledge, and dedication gave me complete confidence throughout the entire mortgage process.

Thanks to Jordan’s hard work, I was able to purchase my flat without any unnecessary stress. I couldn’t recommend him highly enough to anyone looking for a reliable, knowledgeable, and genuinely supportive mortgage adviser. Thank you, Jordan!