Mortgages and finance> Conversion mortgages

Barn conversion mortgages made simple

Looking to finance your barn conversion? Discover everything you need to know about conversion mortgages - how they work, how much you can borrow and the latest rates. Plus, access our FREE 100,000-word barn conversion guide packed with expert insights on every stage of your project.

What is a conversion mortgage?

A barn conversion mortgage, or conversion mortgage, is a specialised loan designed to finance the transformation of an existing structure, like a barn, into a residential home. The main difference between these and traditional mortgages, which finance the purchase of a completed home, is that conversion mortgages release funds in stages as each project milestone is met, similar to self build mortgages. However, they’re tailored specifically for conversion projects, accounting for the unique challenges and costs of repurposing a structure rather than building from scratch.

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How much can I borrow on my barn conversion mortgage?

Use our free barn conversion mortgage calculator to find out within 5 minutes how much you could borrow.

How do barn conversion mortgages work?

A barn conversion mortgage releases funds in stages as your project progresses, rather than providing a lump sum upfront, allowing you to manage costs at each construction phase. This funding model is ideal for projects requiring flexibility and aligns with how costs arise during a conversion.

Stage payments

Funds are released as the project progresses, typically after each construction milestone.

Land purchase funding

Lenders can release funds to purchase land if it has at least outline planning or Class Q permissions.

Deposit requirements

Generally, a 20% cash deposit is required against the project’s total cost, including both land and build expenses.

Flexible end product

Most lenders allow a product transfer to a standard mortgage without early redemption fees post-conversion.

Existing landowners

If you own the land, lenders may allow drawing on the barn’s value for upfront funds, potentially covering 100% of build costs.

Complete funding package

Lenders require full financial approval upfront, including a 10-20% contingency within project costs for unexpected expenses.

How much will my conversion cost?

When you work with us, you’ll get access to our free costing service, led by our in-house cost assessor.

We’ll set up all your trades tasks for you, so you’re ready to hit the ground running. It’s a service designed to save you time, stress, and potentially thousands of pounds.

Why is it more difficult to get a barn conversion mortgage?

  • Fewer lenders are available compared to completed property mortgages, with no funding from major high-street banks.

  • Lenders require a detailed cost report, including contingencies and possibly a minimum build cost.

  • Funds are released in stages, requiring a cash flow forecast to ensure it aligns with your project’s funding needs.

  • Lenders need specifics on the development structure, materials, and certifications.

  • Each lender’s criteria varies hughley

  • Self-build lenders often require specific warranties and site insurance, with differing provider requirements.

We’ve been in your shoes

Our two directors, Mike and Lulu, started Mayflower after they embarked on their own construction project and found the process confusing and difficult. Now, we have over a decade of experience in creating tailored solutions to make the experience easier for you.

What are stage drawdowns for barn conversion mortgages?

Stage drawdowns refer to the phased release of funds throughout your barn conversion project, which enable you to receive financing as specific construction milestones are completed. Typically, funds are released in stages, starting from the land purchase or remortgage (if already owned) through to critical construction points. For conversion mortgages, the typical stage draw downs are:

  1. Purchase land or re-mortgage existing property

  2. Secure and prepare existing structure

  3. Lay foundations or purchase MMC materials (like SIPS or ICF)

  4. Build up to wall plate level or install MMC

  5. Make structure wind and watertight

  6. Complete first fix and plastering

  7. Finalise with second fix to completion 

*MMC=modern method of construction

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What fees do I have to pay on my barn conversion mortgage?

1

Mortgage interest rate

2

Potential cost of full structural report

3

Conveyancing costs

4

Cost of warranty insurance

5

Site insurance cost

6

Your lender may have a product fee

7

Our broker fee. You’re covered by our money back guarantee.

8

Valuation fee and stage releases re-inspection fees.

Our barn conversion mortgage success stories

Latest Barn Conversion Mortgage Rates

Mortgage type
Fees
LTV Land
LTV End Value
Interest Rate
1st Stage Payment
Reno
£799
90%
90%
5.79%
Pre Works
Reno
£795
80%
80%
4.99%
Pre Works
Self & Custom
£1,394
65%
65%
5.49%
Land
Self & Custom
£2,303
75%
75%
5.69%
Land
Self & Custom
£2,325
65%
65%
5.79%
Land
Self & Custom
£1,999
75%
80%
5.90%
Land
Self & Custom
£0
70%
70%
5.99%
Land

The example barn conversion mortgage rates displayed on this website are for illustrative purposes only and are based on current market conditions as of the date 15/03/2026. These barn conversion mortgage rates are subject to change without notice and may not reflect the most current self build mortgage rates available. The actual barn conversion mortgage rate and terms you may be offered will depend on your individual circumstances, including but not limited to your credit rating, loan amount, loan-to-value ratio, construction type, your involvement with the project management and cash flow requirements. The Fees noted have been calculated using a barn conversion mortgage loan of £250,000, fees may vary.

Start your conversion today, in just 3 steps

1

Book a FREE call
Speak with a conversion mortgage expert who can explain the whole process, answer your questions and give you instance access to our Self Build Savers Solution.

2

Get your decision in principle
When you’re ready, we’ll provide lender-backed terms and handle all paperwork for you. And if you’re not ready? You can still benefit from all our free resources.

3

We submit your application
Your dedicated barn conversion expert will be with you from start to finish, guiding you through the process until your build is complete.

Save thousands with our FREE self build savers solution!

Partnering with us gives you access to a wealth of free services, discounts, and cash back offers from national companies, potentially saving you tens of thousands. Best of all, there are no extra costs to access these benefits!

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What do our clients say about us?

Your conversion mortgage service, with a money-back guarantee

We believe in delivering exceptional value, which is why our conversion mortgage service includes a full refund of any fees if you’re not completely satisfied. And to make it easier, we don’t charge any upfront fees.

We’re award winners!

Want a FREE guide to master every step of your barn conversion?

Our Complete Self Build Encyclopaedia is your ultimate guide to creating the home of your dreams. With 100,000 words of expert advice on everything from land acquisition and eco-building to planning permissions and project management, this FREE encyclopaedia gives you the answers you need, all in one place.

How can we support your barn conversion journey?

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Frequently asked questions