This article is for general information only and does not constitute financial advice.
Bridging loans and development finance both fund property projects, but they suit different types of work. Using the wrong one creates problems: a bridging loan on a heavy conversion project leaves you underfunded because the lender will not release additional tranches for build costs. Development finance on a simple cosmetic refurb adds unnecessary cost and complexity.
The distinction is straightforward. If the work is cosmetic and the property retains its current form (new kitchen, bathroom, decoration, rewiring, EPC improvements), you need a bridging loan with a refurbishment element. If the work involves structural changes, new floor plans, building regulations sign-off, or creating new dwellings, you need development finance.
Side-by-side comparison
| Feature | Bridging loan | Development finance |
|---|---|---|
| Typical term | 1 to 18 months | 12 to 24 months |
| Interest rate | 0.55% to 1.2% per month | 7% to 12% per annum |
| How funds are released | Lump sum on day one (some light refurb tranches) | Staged draw-down against QS sign-off |
| LTV/LTC | Up to 75% of current value | Up to 70-80% of total costs |
| LTGDV | N/A | Up to 65-70% |
| Monitoring surveyor | Rarely | Always |
| Suitable for | Acquisition, light refurb, auction purchases | Ground-up builds, conversions, heavy refurb |
When to use bridging
Buy a property at auction (28-day completion). Purchase a property that needs cosmetic work before refinancing onto a BTL mortgage. Fund a chain break while selling another property. Acquire a property that is unmortgageable in its current state (no kitchen, fire damage, asbestos) and needs remediation before a standard lender will touch it.
The work involved does not change the property's footprint or create new dwellings. You are improving what exists, not building something new.
When to use development finance
Convert a commercial building into residential flats. Build new dwellings on a plot. Add storeys or significantly extend an existing building. Any project requiring planning permission for new dwellings, building regulations sign-off for structural work, and a QS-certified build programme.
Development finance releases money in stages as the build progresses. A monitoring surveyor (appointed by the lender, paid for by you) inspects each stage and certifies it before the next draw-down. This protects the lender against the risk of funding a project that stalls mid-build.
Hybrid products
Some lenders offer a "heavy refurbishment bridge" that sits between the two. These fund acquisitions where the work exceeds cosmetic refurb but does not involve ground-up construction. Typical criteria: works costing 30% to 50% of the property value, no structural alterations, no change of use requiring planning permission.
If your project falls in this middle ground, a specialist broker can advise on which product fits.
The cost of getting it wrong
If you take a bridging loan for a project that needs development finance, you run out of money mid-build. The bridge funded the purchase but not the staged build costs. You then need to arrange additional finance (a second charge or an emergency facility at punitive rates) or pause the project. Pausing means the bridging interest continues to accrue on the original loan while no value is being added.
If you take development finance for a project that only needed a bridge, you pay monitoring surveyor fees, higher arrangement fees, and a more complex legal structure for no benefit. The additional cost can be £5,000 to £15,000 on a sub-£300,000 project.
Match the finance to the project.
Sources
- ASTL (Association of Short Term Lenders). https://www.theastl.org.uk/ [Accessed 6 May 2026]