What profit margin do property developers target in the UK?
Most UK property developers target a profit on cost of 20–25% or a profit on GDV (Gross Development Value) of 15–20% as a minimum viability threshold. These are the figures you will encounter in development appraisals, residual land value calculations, and planning viability assessments.
In practice, actual achieved margins vary significantly from this target — and in a difficult market environment like 2024–2026, many projects are being stress-tested against thinner margins or are not proceeding at all.
Profit on cost vs profit on GDV: which to use?
Both metrics are used in the industry, and it matters which you are quoting.
Profit on Cost:
> Profit ÷ Total Development Cost × 100
If a scheme costs £1,500,000 to develop and sells for £1,875,000, the profit is £375,000.
Profit on cost = £375,000 ÷ £1,500,000 = 25%
Profit on GDV:
> Profit ÷ GDV × 100
Same scheme: £375,000 ÷ £1,875,000 = 20%
When comparing schemes or discussing viability with lenders or planners, always clarify which metric is being used. A "20% return" sounds the same but means very different things depending on which basis it is calculated on.
Typical UK development appraisal: residential scheme
Here is a simplified example for a small residential scheme — 5 houses in the South East (not London):
| Item | Amount |
|---|---|
| Land cost | £600,000 |
| Build cost (5 × £250,000/unit) | £1,250,000 |
| Professional fees (architects, engineers, QS, planning) | £95,000 |
| Finance costs (development finance at ~9%) | £120,000 |
| Sales, marketing, and legal | £55,000 |
| Contingency (7.5%) | £100,000 |
| **Total development cost** | **£2,220,000** |
| GDV (5 × £500,000/unit) | £2,500,000 |
| **Profit** | **£280,000** |
| **Profit on cost** | **12.6%** |
| **Profit on GDV** | **11.2%** |
This is a below-target scheme in the current market — most development finance lenders require 15–20% profit on GDV before they will lend. At 11%, this scheme either needs land at a lower price, higher end values, or lower build costs to be viable.
What squeezes margins in 2026
Build costs
UK construction costs have risen significantly since 2020. Material cost inflation, labour shortages, and energy costs have pushed build costs up 30–50% in some sectors compared to pre-pandemic levels. Residential build costs across the UK in 2026 range from:
- Basic market housing: £1,600–£2,200/m² (outside London)
- Mid-range London new build: £2,500–£3,500/m²
- High specification: £3,500–£5,000+/m²
These figures are meaningfully higher than appraisals underwritten in 2019–2021.
Finance costs
Development finance rates in 2026 are substantially higher than the near-zero rates that prevailed in 2020–2022. Rates of 8–12% per annum (rolled up) are common for residential development finance. On an 18-month scheme with peak debt of £1m, finance costs alone can reach £130,000–£180,000.
Planning delays
Delays at LPA level extend the development programme, which directly increases finance costs and extends the period over which fixed overheads accumulate. Projects originally underwritten at 12–18 months may be running at 24–30+ months.
End value uncertainty
Residential sales values have been subdued in much of the UK in 2024–2026. Developer exit strategy matters: selling units off-plan before completion locks in price but may leave money on the table in a recovering market; selling post-completion requires holding finance through the sales period.
Return on equity vs return on GDV
Development finance typically requires the developer to contribute equity (the gap between total costs and the loan amount). Understanding return on equity gives a more complete picture of whether a scheme is worth pursuing.
If total development cost is £2,200,000 and development finance covers 70% of costs (£1,540,000), the developer's equity requirement is £660,000. A profit of £280,000 on equity of £660,000 represents a return on equity of 42% — which looks much more attractive than the 12% profit on cost figure, particularly if the project completes in 18 months.
This is why leverage is central to development economics — but it is also why cost overruns and delays are so damaging. They hit both the profit and the equity simultaneously.
Stress-testing your appraisal
Any development appraisal should be stress-tested against:
- Build cost overrun: What if build costs rise 10–15%?
- End value reduction: What if GDV falls 10%?
- Programme extension: What if the project takes 6 months longer than planned?
- Interest rate change: What if finance costs rise 1–2%?
The question to ask is: at what point does the project become unviable? If a 10% build cost overrun wipes out all profit, the appraisal assumptions are too tight.
Realistic margin expectations by scheme type
| Scheme type | Typical profit on GDV target | Typical achievable (2026 UK market) |
|---|---|---|
| Speculative residential new build | 17–22% | 10–18% (location dependent) |
| Permitted development conversion | 15–20% | 12–18% |
| Commercial to residential | 18–25% | 10–20% (highly variable) |
| HMO conversion | N/A (income) | Yield-based: 8–12% gross yield |
| Refurbishment and flip | 15–25% | 10–20% (below target common) |
| Large residential scheme | 15–18% | 10–16% |
Key takeaways
1. Target 20% profit on GDV as your minimum viability threshold — anything below 15% requires exceptional justification
2. Build cost assumptions are the highest-risk number in any appraisal — get them from a QS, not a rule of thumb
3. Finance costs are material — model them correctly at current market rates, not 2021 rates
4. Stress-test every appraisal before committing to a land purchase or option
5. Residual land value is the correct way to determine what to pay for a site — the land price is the variable that makes the scheme work or not
Use Dwellinger for project cost intelligence
Dwellinger provides build cost benchmarks, residual land value tools, and access to Builder Score-verified contractors for development projects across the UK.