Last reviewed: June 2026
TL;DR- Renovation mortgages provide additional finance for purchasing an uninhabitable or below-standard property and funding its refurbishment.
- Standard residential mortgages may not be available on properties that are uninhabitable - specialist lending is required in many cases.
- Funds for renovation are typically released in stages after inspection rather than upfront.
- Bridging finance followed by refinancing onto a standard mortgage is a common alternative structure for renovation projects.
The Renovation Finance Challenge
Purchasing a property that requires significant renovation presents a mortgage challenge because: standard residential mortgages require the property to be habitable and mortgageable at the point of purchase; the purchase price of a dilapidated property may be low but the total cost including renovation is higher; and the uplift in value after renovation is speculative at the point of purchase.
Lenders who provide renovation finance address this by lending against either the current value (with a facility for additional drawdown as works are completed) or the estimated end value (GDV - gross development value) of the renovated property, subject to the renovation plan being credible and the works being monitored.
Types of Renovation Mortgage
Several product types address renovation finance:
- Specialist renovation mortgage: offered by building societies and specialist lenders, these provide funds at purchase plus a facility to draw additional funds as renovation stages are completed and inspected. Works are monitored by a valuer and funds released in tranches.
- Bridging loan with exit to standard mortgage: a common structure for renovation projects. A short-term bridging loan finances the purchase and renovation. Once the property is renovated and habitable, the borrower refinances onto a standard residential or buy-to-let mortgage. The bridging loan is repaid from the refinance proceeds.
- Further advance after purchase: where the property is mortgageable in its current condition and the renovation is not structural, the borrower purchases with a standard mortgage and then applies for a further advance to fund the renovation.
Uninhabitable Property and Mortgage Availability
Properties classed as uninhabitable - lacking a functioning kitchen, bathroom, heating or structural integrity - are typically declined by mainstream residential lenders. Specialist lenders assess uninhabitable properties using the end value after renovation (GDV) rather than the current dilapidated value, and will lend against the GDV at a maximum LTV, typically 60-70%. Bridging finance is the most commonly used tool for uninhabitable property purchases.
Planning for Renovation Finance
Before applying for renovation finance, borrowers should prepare: a detailed schedule of works with costings from contractors; planning permission (if structural changes or extensions require it); evidence of the expected end value from a surveyor or valuer; and an exit strategy - how the renovation loan will be repaid, whether through sale, remortgage or a further advance. Lenders assess the viability of the project and the exit strategy before approving renovation finance.
Frequently Asked Questions
Can I get a standard mortgage on a property that needs renovation?
This depends on the degree of renovation required. A property that needs cosmetic updating (new kitchen, bathroom, decoration) but is structurally sound and habitable is typically mortgageable through mainstream lenders. A property that lacks a functioning kitchen, bathroom or heating, or has structural defects, is typically not mortgageable through mainstream lenders and requires specialist renovation finance or bridging.
What is a retention on a mortgage?
A retention is an amount withheld by the lender from the mortgage advance at completion, to be released only when specified works have been completed and inspected. For example, a lender may offer a mortgage of £150,000 but retain £15,000 until the roof has been replaced and certified. Retentions are used where a property has a specific defect that reduces its mortgageable value but which the borrower intends to rectify after purchase. The amount retained is typically the estimated cost of the required works plus a margin.
Is planning permission always needed for renovation?
Planning permission is not required for internal works that do not change the external appearance or use of the property. Extensions, loft conversions, changes to windows or rooflines, and changes of use typically do require planning permission. Permitted development rights allow some works without full planning permission - the specific rules depend on the property type, local planning authority policies and whether the property is in a conservation area or listed.
How long does renovation mortgage drawdown take after each stage?
The time between a stage being completed and funds being released depends on how quickly the lender's valuer can inspect and certify the works. This can range from a few days with some specialist lenders to several weeks with others. Borrowers should plan their renovation programme with this lead time in mind to avoid cash flow pressure between stages.
