New-build vs resale: the true cost gap in UK 2026
In the year to date, the median new-build sold in the UK for £346,997. The median resale went for £280,000. That is a 24% headline premium for the box with the show-home kitchen — but the gap looks very different once you adjust for size and energy. Below: what the Land Registry and EPC certificates actually show about the new-build premium, the running-cost gap, and the line items buyers compare on each side.
The headline premium: £67,000 in 2025
Across 848,775 transactions recorded by HM Land Registry's Price Paid file for sales completed January-mid May 2025, the medians split as follows:
| Sample | Transactions | Median sale price |
|---|---|---|
| Resales | 814,153 | £280,000 |
| New builds | 34,622 | £346,997 |
Source: HM Land Registry Price Paid Data, queried 2026-05-14. The new-build share looks unusually low (4.1%) only because the Land Registry registers new-build sales on a lag of several months; the like-for-like share in 2015-2024 ran 9-13%.
That £67,000 (24%) premium is the number that gets quoted in property pages. It is also misleading on its own, because a new build is rarely a like-for-like swap for the resale you would otherwise buy.
Adjusting for size shrinks the gap to about 6%
The Department for Energy Security and Net Zero's EPC Open Data file records total floor area for almost every property sold in England and Wales. Joining EPCs to Land Registry transactions for 2024-2025 gives a per-square-foot view:
| Sample | Median £/sqft | Average floor area |
|---|---|---|
| Resales | £295 | 95.5 m² (1,028 sqft) |
| New builds | £314 | 104.0 m² (1,120 sqft) |
Source: EPC Open Data joined to Land Registry transactions, n = 2.04M resales and 91,797 new builds with valid floor area, sales dated 2024-01-01 to 2025-12-31.
In other words, about 60% of the headline premium reflects the new build being a larger property in a different part of the country. The true price quality buyers are paying for, per usable square foot, is closer to 6%.
This matters because in the same postcode area, the gap can look extreme. Across postcode districts with at least 30 new-build sales and 100 resales in 2024-2025, the new-build average ran more than 80% above the resale average in W2, SE1, W8 (large central-London developments dragging the average up) and in regenerating Northern districts (DH9, TS26, NE5) where new estates sit next to older terraces. Within the same district, you are often comparing two genuinely different products, not the same product at a different price.
The energy gap is the real new-build advantage
This is where new builds stop looking like a packaging premium and start looking like a different product class. Of the 91,773 new builds sold in 2024-2025 with a valid EPC:
| EPC rating | New builds | Resales |
|---|---|---|
| A | 14.2% | 0.3% |
| B | 83.1% | 7.1% |
| C | 2.2% | 29.8% |
| D | 0.4% | 43.6% |
| E or below | < 0.1% | 19.2% |
Source: EPC Open Data, transactions 2024-01-01 to 2025-12-31, n = 91,773 new builds and 2.05M resales with both a sale record and an EPC.
About 97% of new builds sold last year were rated A or B for energy. Only 7% of resales were. The modelled annual energy cost on the EPC certificate sits at £75 a year for the median new build versus £257 a year for the median resale — a roughly £180/year notional saving.
A heavy caveat applies: EPC running-cost models use 2012-era assumptions and do not reflect current Ofgem prices, household occupancy or behaviour. Real bills regularly run 2-4x the EPC figure. The gap between an A and a D is, however, broadly directional — a rating-A home does cost meaningfully less to run than a rating-D one, even if the absolute numbers on the certificate are stale.
Hidden costs each side adds
Both sides come with line items the headline price hides.
New-build extras
- Many new-build flats are sold leasehold with annual service charges typically £1,500-£4,500 depending on the development and amenities, plus a ground rent (capped at £nil on most leases granted after 30 June 2022 under the Leasehold Reform (Ground Rent) Act 2022, though older leases may retain doubling rents).
- Buildings-insurance contributions are usually rolled into service charge for flats.
- Snagging is a one-off cost. An independent NHBC-registered snagger typically charges £300-£600 for a small flat to £600-£1,200 for a four-bed house. Most reputable developers fix listed items free under the two-year warranty, but persuading them is not always straightforward.
- New-build mortgages on flats above a commercial premises, or in tall blocks, attract more lender scrutiny since the post-Grenfell EWS1 framework was tightened. RICS guidance on cladding remains the reference document.
- Help-to-Buy and shared-ownership equity loans (where the development was sold under those schemes) attract interest from year six and a charge on resale.
Resale extras
- Retrofit. Moving a typical D-rated resale to a C rating runs roughly £5,000-£15,000 for insulation and modest fabric upgrades, more for a full retrofit including heat pump (Energy Saving Trust, 2024 average). Government grant routes like the Boiler Upgrade Scheme defray part of the heat-pump cost.
- Unknowns. A 70-year-old roof, a hidden damp problem, or a boundary dispute the previous owner never disclosed. A Level 2 HomeBuyer Report (£500-£900) or Level 3 Building Survey (£700-£1,500) is the standard mitigation; RICS publishes the framework.
- Chains. New-build completions are typically chain-free for the buyer. A resale purchase that depends on the seller finding a property is statistically more likely to fall through — HMRC's Land Transaction Statistics show 25-30% of property transactions abandon at some point before completion in normal market years.
What the mortgage maths looks like at the same price
At today's Bank of England average two-year and five-year quoted rates (4.32% on a 75% LTV five-year fix as of April 2026), a 25-year repayment mortgage on the same purchase price gives the same monthly payment whether the property is new build or resale. The mortgage product does not discriminate by build type for most mainstream lenders, provided the property is mortgageable (the chief exceptions are short-lease flats and developments with outstanding cladding remediation).
Where the cost diverges is in total cost of ownership: a new-build buyer typically pays around £180/year less in energy (per EPC modelled estimate) but adds service charge if leasehold; a resale buyer skips the service charge if freehold but typically pays more in energy and faces a higher retrofit liability over a 10-15 year hold.
Council tax — the third pillar of running costs — does not split by build type. It splits by local authority Band D, which runs from £1,028 (Westminster) to £2,765 (Rutland-area authorities) for 2026-27 (gov.uk). Whether a band D home is a 2024 new-build or a 1930s semi, the bill is the same on the same street.
What to ask before paying the premium
The questions worth answering before signing on either side, in plain terms:
- Is the new-build price including any developer incentives — stamp duty paid, carpets, white goods? These are common and should reduce your effective premium.
- For a leasehold new build, what is the service charge schedule for the next five years, what does it include, and who sets it? The Leasehold Reform Act 2024 strengthens transparency but does not cap charges.
- For a resale, what is the EPC rating today and what would moving it up two bands cost? An Energy Performance Certificate is mandatory at point of sale.
- For either, request the True Cost view for the actual property — mortgage at today's rate, council tax for the right LA, energy from the actual EPC. Headlines are seductive; the line-by-line bill is what you sign up to.
Try the tool for any specific address
Type a postcode into Homecost to see every property on the street with its Land Registry sale history, EPC rating and modelled True Cost (mortgage at the latest BoE quoted rate, council tax from gov.uk and energy from the EPC). New-build estates and 1930s terraces sit on the same screen, scored on the same comparable.
For deeper reading on the line items that go into either side, see hidden costs of buying a house in the UK (2026) and the energy cost by EPC rating guide. Buyers fixing on a budget can compare the true cost of buying a £300,000 home or browse other cost intelligence guides.
Figures are sourced from HM Land Registry Price Paid Data (queried 14 May 2026), DESNZ EPC Open Data, gov.uk council tax rates 2026-27, and Bank of England quoted mortgage rates (March/April 2026 release). EPC running-cost figures are modelled, not measured. This article is general information, not advice. Speak to a qualified adviser, conveyancer or surveyor before acting on any individual purchase.