How to Get a Mortgage on a Renovation Property in the UK

June 2025

Find a property at a significant discount because it needs serious work and you'll quickly discover that standard mortgage lending doesn't accommodate renovation. The same features that make the property an opportunity — a missing kitchen, a dangerous roof, structural issues — are the features that cause a high street lender's valuer to mark it "unsuitable for mortgage purposes." Understanding how specialist finance works is essential before you bid.

Why Standard Mortgages Reject Renovation Properties

High street lenders lend against a property as security. The property needs to be insurable, lettable (for BTL), and in a condition the bank could realise value on if you defaulted. Properties that fail standard mortgage criteria typically fall into one of these categories:

No working kitchen or bathroom: Most lenders require both to be present and functional
Structurally unsound: Missing roof sections, dangerous floors, severe subsidence or damp
Property is derelict or uninhabitable: RICS-qualified surveyors will mark a property as "not suitable for mortgage purposes" on a formal valuation
Short lease: Leases under 70–80 years (depending on lender) are also commonly declined

"Cosmetically tired" is a different matter entirely. Dated décor, an old kitchen that functions, original single-glazed windows — these are unlikely to trigger a refusal on their own. The line is functional habitability, not aesthetic quality. A property with a 1970s kitchen will usually get a mortgage; a property with no kitchen at all won't.

Bridging Loans: Fast but Expensive

A bridging loan is a short-term secured loan — typically 12–18 months — designed to bridge the gap between purchasing a property and either refinancing it or selling it. They're commonly used to buy properties at auction where standard mortgage timescales (weeks) are incompatible with the completion deadline (typically 28 days).

Key figures:

Interest rates: 0.5–1.5% per month, depending on loan-to-value and the lender's assessment of risk
Arrangement fees: 1–2% of the loan value
Exit fees: Some lenders charge 1% on repayment; others don't
LTV: Typically up to 70–75% of purchase price; some lenders will lend against "day one value" plus projected GDV (gross development value)

On a £200,000 bridging loan at 1%/month for 12 months, you're paying £2,000/month in interest — £24,000 over the year, plus arrangement fees of £2,000–£4,000. This is why the refurbishment-to-remortgage strategy is only profitable if the uplift in property value — and speed of works — justifies the financing cost.

Always use a bridging loan broker rather than going direct. Rates and terms vary enormously; a broker with whole-of-market access will get better terms than you can find alone.

Renovation Mortgages and Staged Drawdown Products

If you want a longer-term product — or if you're doing a substantial renovation and need the finance structured around the build programme — there are specialist mortgage products worth knowing:

Renovation mortgages: Some specialist lenders (including certain mutuals and specialist banks) offer mortgages on properties that standard lenders won't touch, at slightly higher rates. The lender may require the works to be completed within a set timeframe and will re-inspect before releasing final funds.

Staged drawdown mortgages (self-build style): Products offered by lenders such as Buildstore, Bath Building Society, and Ecology Building Society allow funds to be drawn down in tranches as work reaches agreed stages. Each drawdown is assessed by a valuer or monitoring surveyor who confirms the works have been completed to a satisfactory standard. Rates are typically 0.5–1% higher than standard residential rates; arrangement fees of £500–£2,000 are common.

Refurbishment buy-to-let bridging: For investors, specialist lenders will provide a bridging loan to purchase and renovate, with an exit onto a standard buy-to-let mortgage once the property meets standard lending criteria. Lenders like Together, MT Finance, and LendInvest are active in this space.

The Refurbishment-to-Remortgage Strategy

This is the core model for many property investors. The sequence is:

Buy a below-market property — often at auction — using a bridging loan or cash
Complete the renovation works to bring the property to a habitable, mortgageable standard
Obtain an independent RICS valuation reflecting the improved property
Remortgage onto a standard residential or BTL mortgage, repaying the bridging loan
Extract some or all of the invested capital, retaining equity

The numbers need to work: the post-renovation value must be sufficient to repay the bridge, the renovation costs, and the finance charges, while leaving meaningful equity. Areas with strong residential demand and a significant gap between "tired" and "done" values are where this model delivers returns.

What Surveyors Flag That Triggers a Mortgage Refusal

RICS valuers completing a mortgage valuation are instructed to flag conditions that affect the security value. Common flags include:

Subsidence or movement — noted in the surveyor's report, typically requiring specialist investigation before lending proceeds
Presence of invasive species — Japanese knotweed within 7 metres of the property is a standard flag; many lenders won't lend without a management plan in place
Major roof or structural defects — missing sections, severe sagging, unsupported gable walls
No working utilities — no kitchen, bathroom, heating, or water
Short lease — anything below 70–80 years, or an unexpired term that will fall below 70 years within the mortgage term

If you're buying something that will flag on valuation, plan the finance around that reality from day one.

How to Find a Broker Who Specialises in Renovation Finance

This isn't a job for a comparison website or a high street bank. You need a whole-of-market mortgage broker who has active relationships with specialist lenders. Ask specifically:

Do you have experience with bridging loans for renovation?
Which specialist lenders do you work with (Buildstore, Together, Precise, LendInvest, etc.)?
Can you advise on both the bridge and the exit mortgage?

The Association of Short Term Lenders (ASTL) and the National Association of Commercial Finance Brokers (NACFB) both maintain directories of regulated members. Fees are typically 1–1.5% of the loan; some brokers charge a flat fee of £500–£2,000 instead.

The finance is as important as the renovation itself. Getting the wrong product at the wrong rate will erode every pound of value you add to the property.

For a detailed guide to specialist lenders, bridging loan structures, interest treatment options, and a full cost table for a £150,000 bridging loan over nine months, see Getting a Mortgage on an Uninhabitable Property in the UK.

For a comprehensive guide to the 6 most common mortgage deal-breakers — short lease, non-standard construction, knotweed, subsidence, flood risk, and EPC F/G — including which specialist lenders will consider each and typical rate premiums, see our mortgage on a property with issues UK guide.

If you're deciding between a garden room and an extension, the Party Wall Act is one of the key differences: extensions frequently trigger it (particularly for semi-detached and terraced houses), while most garden rooms don't. For a full planning and building regs comparison, see our garden room vs extension guide.

If your property is already owned and you're looking to borrow to fund improvements, our remortgaging for home renovation UK guide covers further advances, full remortgages, and second charges — with worked examples to help you calculate whether triggering an early repayment charge is worthwhile.

Ready to plan your renovation? Renovate Me gives you a step-by-step roadmap — try it free