Before offering a quote for a refurbishment project, a lender first asks one key question: is the work light or heavy?
This decision changes your interest rate, the maximum loan you can get, and how you receive the funds. Many investors think the difference is about cost, but lenders look at other factors.
If you know which category your project falls into before you talk to a lender, you can price the deal correctly and plan your budget. If you get it wrong, you might not find out until weeks later, sometimes right before a tight deadline.
For details on loan size, costs, and repayment, see refurbishment finance.
What counts as light refurbishment?
Light refurbishment means making cosmetic changes without touching the building's structure.
Most lenders see the following as examples of light refurbishment:
- Installing new kitchens and bathrooms, provided the layout remains the same
- Replastering, redecorating, and laying new flooring
- Replacing windows and doors as long as you use the existing openings
- Updating the boiler, radiators, or other heating systems
- Swapping out fittings, sockets, or light fixtures
- Handling garden clearance, fencing, or driveway improvements
- Adding insulation or carrying out EPC upgrades that do not impact the structure
After this kind of work, the building's use stays the same. Only the look, comfort, and natural light inside change.
What counts as heavy refurbishment?
Heavy refurbishment means making structural changes or doing work that changes how the building is used.
Lenders usually see these as examples of heavy refurbishment:
- Building single or double storey extensions
- Converting lofts or basements
- Removing or moving load-bearing walls
- Splitting a single house into self-contained flats
- Turning a house into an HMO, where unrelated tenants rent rooms individually
- Changing the use of a property, for example converting offices or shops into residential units
- Carrying out underpinning, subsidence repairs, or major roof structure work
These projects usually take longer, carry more risk, and need extra paperwork. If a project does not clearly fit either category, lenders use a specific test to decide.
How do lenders decide if work is light or heavy?
Lenders decide your project's category not by cost, but by the type of work.
Some lenders also use a spend test, flagging projects where costs go over about 15% to 20% of the property's value. This is a secondary check. The main test is always the type of work.
Here are some examples to show how these rules work:
- Removing a load-bearing wall is heavy, even at £4,000, because it is structural work.
- Fitting two new kitchens, two new bathrooms, and redecorating throughout is light, even at £60,000, as long as the structure stays the same.
- Turning a three-bedroom house into a five-bedroom HMO is heavy, since the use is changing.
- A like-for-like re-roof is usually classed as light. You rarely need planning permission, but building regulations might still apply. Always check with your lender.
Be just as careful with electrical work. Swapping fittings like-for-like is light. But a full rewire of an empty house usually needs building control approval, and some lenders will call that heavy refurbishment.
How do light and heavy refurbishment loans differ?
Once your project is classed as light or heavy, a few things change before you start: your rate, how much you can borrow, how you get the money, and who checks the work.
First, how the lender values your property depends on your project's category. GDV, or gross development value, is what the property will be worth after the work is done. For light refurbishment, you borrow against the current value. For heavy projects, the lender uses the future value.
Remember, your loan-to-value, experience, and exit plan affect your rate more than the project label itself. Loan-to-value (LTV) is the loan amount as a percentage of the property's value.
How is a refurbishment loan paid out?
The project label also determines when you receive your funds, either before or after the work is done.
To make this clear, imagine a £200,000 terraced house with a £30,000 budget. Let us look at both scenarios.
If your project is classed as light, you plan £30,000 of cosmetic changes. You borrow against the current value, receive all funds at completion, and can start work right away.
If it is a heavy project, such as a £30,000 rear extension, the funds come through staged drawdowns. The lender releases money in tranches as each phase is completed. You pay the contractor first, then a surveyor signs off the work, and the lender reimburses you.
Even if the property and budget are the same, your cash flow needs will be very different. With heavy refurbishment, you have to pay for each phase upfront. Many new borrowers miss this gap, and it is often not included in early calculations.
If you are funding from overseas, make sure to allow time for each payment transfer. Missing a payment can stop your project, and interest keeps adding up even if the builders are not working.
Do you need planning permission, or building regulations approval?
They are separate systems. A project may need both, one, or neither.
Planning permission is for changes to a building or how it is used. Building regulations make sure the work is safe and built properly. Light work might not need planning permission but could still need building control.
Some works fall under permitted development, such as certain loft conversions. Splitting a house into flats usually does not.
Before relying on permitted development, check whether an Article 4 direction, listed status, or conservation area rules apply.
You do not always need approval before applying. Many lenders issue terms subject to it, but they will not release funds for unapproved works.
What if your project sits between the two?
Ask before you apply. Getting it wrong can be expensive.
Some lenders offer a medium refurbishment tier for extensive non-structural work, but most do not. Borderline cases are usually treated as heavy refurbishment, with pricing to match.
If you assume the wrong category, your appraisal may be wrong too. A mid-application reclassification can mean a new rate, fresh underwriting, and requests for planning documents you may not yet have. On a purchase with a fixed completion deadline, that delay can put the deal at risk.
There is also a limit to what counts as refurbishment. A full house-to-flats conversion, major basement dig, or ground-up build will usually need development finance, not a bridge. If the project has moved that far, a refurbishment lender is the wrong route.
How do you fund a light refurbishment?
Light refurbishment is usually funded with a single-release bridging loan. Because the works are limited, the lender normally releases the funds at completion rather than in stages.
The main challenge is often timing. If a property has no working kitchen or bathroom, it may not pass a buy-to-let survey. That can close off the mortgage route, especially when a purchase completion date is already fixed.
For overseas investors or buyers with little UK credit history, some lenders focus on the property and your exit plan instead of just your income. This can make bridging finance a good option when you cannot get a standard mortgage right away.
For GoGoProp's bridging loan terms, see our product page:
GoGoProp lends under Money Lending Licence No. 1341/2025.
Key takeaways
- The type of work, not the cost, sets your project's category. Removing one load-bearing wall makes any job heavy.
- Planning permission and building regulations are separate. Light work may still need building control.
- Light work is funded in one payment. Heavy work is funded in stages, and you pay each phase first.
- Only the lender can confirm the category. Get this in writing before you exchange contracts.
- Flats, basements, and ground-up builds require development finance, not a bridging loan.
Frequently asked questions
1. Is a loft conversion light or heavy refurbishment?
This is almost always heavy refurbishment. It is structural and usually needs building regulations approval, even if planning permission is not required.
2. Is EPC or insulation work light or heavy?
Most upgrades, like loft or cavity insulation, a new boiler, or better glazing, are light work. External wall insulation or replacing the floor structure is structural, so it counts as heavy.
3. Do I need planning permission before I apply?
Not usually. Many lenders issue terms subject to permission, but they will not release funds for unapproved work.
4. Can I do the work myself, or do I need a contractor?
It depends on the lender, the scale of the works, and your experience. The lender's main concern is whether the refurbishment can be completed safely, on budget, and within the loan term.
5. Can I switch from light to heavy once work has started?
Not on the same facility. You would need to renegotiate or refinance, and both cost time and money.
