New-Build Premium Calculator
New builds sell for more than the same home does second-hand, and that gap is paid once. Enter the asking price and see the premium in pounds, the resale-equivalent value today, and what the home might fetch after the years you plan to hold it.
What the new-build premium is
A developer sets the price of a new home; the second-hand market sets the price of everything else. Across England new builds sold for about 29% more than existing homes on average (UK Property Development analysis of HM Land Registry price-paid data, 2026-08). That figure is a gap between average prices rather than a like-for-like adjustment — new homes are, on average, newer and better insulated — but the part of it that is simply “new” is gone the day you move in.
The calculator removes the premium to give a resale-equivalent value, then grows that at the rate you choose. Whether you get the premium back depends on how long you hold the home and how prices move; the break-even line says how many years of growth the premium alone needs. Developer incentives (a deposit contribution, stamp duty paid, upgrades) reduce what you pay without reducing the price the next buyer sees — enter the price, not the price less incentives.
The premium varies a great deal by region and by development. A HomeThink report measures it locally — median first-sale price against median resale price for the same property type, within 1 km over 36 months — wherever enough of each exist, and says when it has fallen back to the national figure.
Frequently asked questions
- Is the new-build premium the same everywhere?
- No. It ranges from a discount in London to well over half in parts of the north and Scotland, and differs between developments on the same road. Treat the national default as a starting point and use a local figure when you have one.
- Do I get the premium back when I sell?
- Usually not in full. You sell into the second-hand market, so the buyer compares your home with existing homes nearby. Growth in the market can make up the gap over time; the break-even line shows how many years that takes at the growth rate you assume.
- Does a developer incentive change the premium?
- It changes what you pay, not the price on the register. Lenders value on the headline price and deduct incentives above 5% of it, so a large incentive can leave a mortgage shortfall even though your cost is lower.
- Is this a valuation?
- No. It is arithmetic on the figures you enter and a published national average. A valuation of a specific home needs comparable sales for that home, which is what a HomeThink report does.
Related guides
An estimate, not a professional valuation. For a mortgage or for legal purposes you will need a RICS-accredited surveyor.
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