Converting a dusty office or a redundant shop into high-demand housing is one of the smartest moves in today's market. With the UK's housing shortage showing no signs of slowing, repurposing commercial assets is not just a trend; it is a necessity. The challenge is that securing the finance for these deals is entirely different from a standard buy-to-let mortgage.
We see the same pattern regularly. Lenders who do not understand the conversion model default to overly cautious, cost-based lending. A viable scheme that does not get funded, or one that requires more of your own capital than necessary, is a challenge we help developers navigate every week.
The fix is working with a specialist who knows which lenders fund against GDV and who understands planning risk properly.
Why conversion makes sense right now: Class MA
The planning landscape has shifted in favour of developers. Permitted development rights, specifically Class MA, let you flip buildings from commercial Class E to residential C3 without the complexity of a full planning application, reducing both lead times and planning risk.
Lenders respond well to PDR projects because the path to completion is clear from the outset. You will still need prior approval for things like natural light and space standards, but you will not be fighting a planning committee for eighteen months. If you are looking for permitted development finance, Class MA is the most effective route for accessing higher leverage on conversion projects.
The finance stack: bridging to development
No two conversions are the same. You might be doing a light-touch flat conversion or a full-scale office block overhaul. Your finance needs to match that scale.
Bridging loan for commercial conversion
Speed wins deals. If you are buying at auction or snagging an off-market gem, you do not have time for a three-month bank application. A bridging loan gets you the keys fast. It is the right tool when a building is currently unmortgageable because it is a shell, or when you simply need to move without delay.
Development finance: the heavy lifter
For the bigger schemes, you need commercial conversion development finance. This is not based on what you paid for the site; it is based on what the units will be worth when you are done.
· Day one: lenders typically advance 60% to 70% of the purchase price.
· The build: lenders drip-feed construction costs in tranches as you hit your milestones.
· The cap: total lending is usually capped around 60% to 65% of the gross development value.
Refurbishment finance
If you are not moving structural walls or adding floors, full development finance is probably overkill. Refurbishment finance products are the middle ground. They are quicker to set up, have lower fees and are perfect for light-touch projects that just need a face-lift before they are ready for tenants.
How lenders actually judge your deal
Experienced developers know it is not just about the bricks. It is about the exit.
GDV vs cost-based lending
We see this all the time. A developer buys a site at a strong price, but the lender only wants to fund a percentage of that low purchase price. We push for lenders who prioritise GDV-based lending. By focusing on the end value, we can often structure deals that require much less of your own capital.
The planning and VAT trap
Lenders will scrutinise your prior approval or planning status. They will also want to know you have a handle on VAT. Many conversions qualify for a reduced 5% VAT rate on works, which is a significant cash flow benefit. If you have not budgeted for this, or if you do not have a professional schedule of works, a lender will likely back away.
The exit: sale or hold?
Lenders will not advance a penny if they do not see how they get their money back.
The sale exit: if you are flipping the units, the lender will look at local demand. Are people actually buying two-bed flats in that postcode?
The hold exit: if you are keeping them, you will need an office-to-residential conversion mortgage or a specialist buy-to-let facility. This often involves title splitting to create individual leases, which lets you pull out the maximum equity once the project is finished.
Frequently asked questions
Can I get 100% of the build costs?
Usually yes. Most development lenders fund 100% of the build in arrears, provided the total loan does not exceed the GDV cap.
Do I need a track record?
It helps secure the best rates, but we can fund first-time developers if you have a solid team of contractors and surveyors around you.
How long does the finance take to arrange?
Bridging can complete in days. Full development finance usually takes four to eight weeks because of the technical valuations and monitoring surveyor reports involved.
What about Building Regulations?
Crucial. Even with permitted development rights, you need to meet residential Building Regs for sound, fire and heat. Lenders will not sign off on tranches if the work is not up to code.
Last updated: 10 May 2026