Refurbishment Finance Calculator

Light refurbishment bridging is designed for investors and developers buying properties that are structurally sound but cosmetically tired or vacant. The product is simpler and cheaper than its heavy counterpart: funds are released in a single advance on day one, interest rates are typically at the lower end of the bridging market (0.55–0.85% per month), and lenders will advance up to 70% of the current market value without requiring a surveyor to inspect and certify completed works.

Typical works that fall within the light refurbishment definition include full kitchen and bathroom replacements, redecoration throughout, new flooring and carpets, window replacements, new central heating systems, and minor repairs to roofs or external fabric. The dividing line is structural intervention: if the works require building regulations sign-off beyond standard replacement of fixtures and fittings, most lenders will reclassify the loan as heavy refurbishment.

The underwriting focus for light refurbishment loans is the current value of the security and the exit strategy. Lenders will commission a RICS valuation of the property as it stands, assess the planned works at a high level, and confirm that the exit — usually a sale or remortgage onto a buy-to-let or residential product — is achievable. They are not typically involved in monitoring the works in progress.

Heavy refurbishment finance accommodates structural works — extensions, loft conversions, reconfiguration of internal layout, change-of-use conversions, and any works requiring planning permission or full building regulations approval. Because these projects carry greater execution risk and can increase the property's value significantly, lenders underwrite them differently: they lend against the gross development value (GDV) rather than purely the current as-is value, typically advancing up to 75% of GDV across the total facility.

The day-one advance — the amount released on completion of the purchase — is typically calculated against the lower of the purchase price or the as-is value, commonly 65–70% of that figure. Subsequent tranches are released as the works progress and are inspected and certified by a quantity surveyor (QS) or monitoring surveyor appointed by the lender. The final tranche is released on practical completion when the property reaches its projected end value.

From the borrower's perspective, staged drawdown means interest is only charged on funds actually drawn, which reduces the cost of carry during construction. A £800,000 total facility with a £400,000 day-one advance and four further tranches of £100,000 means interest runs only on £400,000 during the early months of the build, stepping up as each tranche is drawn. This is a meaningful cash flow advantage on larger projects.

The monitoring surveyor — often referred to as the QS — is the lender's eyes and ears on a heavy refurbishment project. They visit the site at agreed intervals (typically monthly or at the completion of defined construction stages), certify the value of works completed, confirm that the project is on programme and within budget, and recommend the release of the next tranche. Their fee, typically £1,000–£3,000 per site visit depending on project scale, is paid by the borrower.

Drawdown requests are initiated by the borrower once a defined stage of works is complete. The borrower notifies the lender and the monitoring surveyor, who arranges an inspection within five to ten working days. If the works are certified as complete to specification, the lender releases the next tranche — usually within two to three working days of receiving the surveyor's report. Efficient project management around the timing of drawdown requests materially affects the overall cost of the facility.

Lenders require the borrower's contractor to be appropriately insured, and most require a JCT contract (or equivalent) to be in place before committing to fund. Unfixed materials on site are not usually included in the certified value — lenders fund completed works, not materials held in storage. This is a common source of friction for borrowers whose contractors have paid for materials ahead of installation.

The most common exit from a refurbishment bridging loan is a refinance onto a buy-to-let mortgage once the works are complete and the property is tenanted or ready to tenant. Buy-to-let lenders assess the property in its improved condition, lending against the higher post-refurbishment value and using the rental income to underwrite serviceability. A property purchased for £250,000 on a light refurbishment bridge and improved to a value of £320,000 can typically support a 75% LTV buy-to-let mortgage of £240,000 — potentially repaying the bridging loan in full and returning the original deposit.

Where the exit is a sale, the borrower's solicitor handles the conveyancing in the normal way. The bridging lender is repaid from the net proceeds of sale, and any surplus is returned to the borrower. For development-scale heavy refurbishments producing multiple units, development exit finance — a specialist product designed to take out a development or heavy refurbishment loan while units are sold — may be more appropriate than selling under the pressure of a bridging loan expiry date.

Regardless of exit route, borrowers should build a buffer of at least two to three months into their loan term to account for construction delays, slower-than-expected sales periods, or mortgage processing timelines. Running close to a loan expiry date on a bridge creates unnecessary pressure and can lead to adverse terms on a loan extension if required.