Getting the refurbishment budget right is one of the most consequential skills in UK property investment. Get it wrong on the low side, and you are mid-project, out of capital, and negotiating with a lender for more drawdown. Get it wrong on the high side, and you walk away from deals that would have worked.
Most investors get it wrong on the low side, and for predictable reasons.
The mistake is not in the cost-per-metre calculation. Most investors have a rough sense of what a kitchen costs and what a bathroom costs. The mistake is in what gets left out.
Two line items are consistently missing from investor-prepared refurbishment budgets: professional fees and contingency. Between them, they add 27% to the base works cost. On a £40,000 refurbishment, that is £10,935 missing from the budget before a single contractor has been appointed.
The second mistake is applying the wrong regional benchmark. Labour and materials costs vary by up to 72% across the UK, from the most expensive region (London at 1.55x the national benchmark) to the cheapest (North East and Northern Ireland at 0.90x). Using a national average for a London deal, or applying London rates to a northern deal, produces a budget that is wrong by tens of thousands of pounds.
The third mistake is choosing the wrong specification level. A property that genuinely needs a new boiler, a full bathroom suite, and replastering throughout is a Heavy Refurb, not a Medium Refurb. Categorising it as the cheaper level to make a deal look more viable on paper does not change what the property needs. It just means you will overspend the stated budget.
Property Filter's free Property Refurbishment Cost Calculator addresses all three of these problems. Enter your property size, your UK region, and the appropriate finish level, and it returns your base works cost, professional fees, and contingency as separate figures, combined into a total project cost.
UK refurbishment projects fall into five broad specification levels. Each is defined by scope, not by price. The price follows from the scope.
Touch Ups (£80/m²) The lightest possible intervention. Kitchen modernisation only (new taps, handles, flooring, and tiling). Bathroom silicon and waterproofing. Walls painted throughout (approximately 80% coverage). No structural work, no new units, no system replacements. Suitable for a property that is presentable but dated, where the goal is a quick, cosmetic refresh rather than a significant value uplift.
Light Refurb (£150/m²) A step up in kitchen and bathroom work. Kitchen units are painted rather than replaced, grout is re-done, taps and handles are new, and flooring is replaced. The bathroom gets new tiling, fresh silicone, and proper waterproofing. Decoration increases: 30% of walls are skimmed, walls and ceilings are painted, and all bedrooms receive new carpet. Still no structural work or system replacement.
Medium Refurb (£450/m²) The point at which the property gets a genuine transformation. Full kitchen replacement: new units, tiling, countertops, taps, and handles. Full bathroom replacement: new toilet, shower, and sink, with full tiling. Systems: boiler repair (not full replacement). Decoration: 80% of walls are skimmed, 100% of the property is painted including skirting boards and doors. Flooring: new carpet in all bedrooms, tiling in kitchen and hallways. This is the specification level for the majority of standard BTL and BRRR refurbishments.
Heavy Refurb (£900/m²) The full upgrade. Kitchen gets new appliances, units, tiling, and countertops. Bathroom gets a complete new suite including plumbing. The boiler and all radiators are replaced (not repaired). 80% of walls are fully plastered, the entire property is painted including skirting. New carpet in bedrooms and lounge, tiling in kitchen, hallways, and dining room. This level is appropriate for a property that has had no meaningful investment for 15+ years, or where the existing kitchen and bathroom are genuinely beyond cosmetic remedy.
Extreme Renovation (£1,500/m²) Structural and systemic overhaul. Complete roof replacement. New windows and UPVC doors. Full electrical rewire with a new consumer unit. New boiler and radiators. Full kitchen and bathroom replacement with new plumbing. 80% plastering and full decoration throughout. External works: skip hire, new gutters, fencing, exterior painting, and outdoor tidy. This is the specification for a derelict or near-derelict property, or one where a full structural survey has identified systemic problems across multiple building elements.
The regional multiplier is applied to the base works figure and changes every line item in the budget. On a 90m² Medium Refurb at £450/m²:
Region | Multiplier | Base Works | Total (inc fees + contingency) |
|---|---|---|---|
London | 1.55x | £62,775 | £79,724 |
South East | 1.30x | £52,650 | £66,866 |
East/South West | 1.15x | £46,575 | £59,150 |
Midlands (benchmark) | 1.00x | £40,500 | £51,435 |
North West | 0.95x | £38,475 | £48,863 |
Yorkshire, Wales, Scotland | 0.92x | £37,260 | £47,320 |
North East, N. Ireland | 0.90x | £36,450 | £46,291 |
London costs £33,433 more than the North East in total project cost for the same scope. That figure represents the actual cash you need to have available, not a rounding error.
If you are building a portfolio across multiple regions, always apply the correct regional multiplier for each deal rather than using a single national figure. The deals that look thin on one set of numbers often look viable on the correct regional costs, and vice versa.
The total project cost from the calculator is the figure that goes into your deal analysis, not the base works cost.
When you present a refurbishment deal to a bridging lender, a development finance lender, or a JV partner, they will apply their own stress test to your numbers. Any lender with experience in property investment will add professional fees and contingency to your base works figure if you have not already done so. Presenting a budget without them does not save you money. It raises questions about your experience.
Use the total project cost figure in your deal analysis alongside the purchase price, stamp duty, and all holding and exit costs. The ratio of total refurbishment spend to purchase price is a useful sanity check: under 15% is typically efficient; 15-25% is acceptable with strong GDV evidence; over 25% requires careful scrutiny of your end value assumptions.
For BRRR deals, the refurbishment cost is central to your recycled capital calculation. After refinancing, you need the new mortgage to recover both the purchase cost and the refurbishment cost to recycle capital effectively. Use Property Filter's BRRR Deal Calculator alongside the refurbishment estimator to model the full deal.
Disclaimer: This guide provides educational information about UK property refurbishment costs and should not be considered financial, professional, or construction advice. Cost benchmarks reflect typical market rates and are for planning purposes only. Always obtain formal contractor quotes before committing to any refurbishment project. Property Filter is not responsible for financial losses resulting from business decisions based on this content.
