New-build buying costs (UK)
Model total new-build purchase costs using the calculator, then pressure-test assumptions for reservation and completion timing.
New-build purchases carry the same core costs as any home — deposit, stamp duty (or LBTT in Scotland, LTT in Wales), conveyancing and mortgage fees — plus a few extras. Expect a reservation fee (often £500 to £2,000, usually deducted from the price), a developer legal pack with tighter exchange deadlines (many require exchange within 28 days), and a new-build conveyancing premium of roughly £150 to £350. It is also worth budgeting for a snagging survey (£300 to £600) and checking the 10-year structural warranty. Watch for estate or management charges on newer developments. Use the calculator to model your all-in completion cost.
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Frequently asked questions
What extra costs do new-build homes have?
On top of the usual deposit, stamp duty, conveyancing and mortgage fees, new-builds typically add a reservation fee, a new-build conveyancing premium of around £150 to £350 for the extra legal work, a snagging survey, and sometimes ongoing estate management charges on new developments. Factor these in before you commit to a plot.
What is a reservation fee on a new-build?
A reservation fee is a payment (commonly £500 to £2,000) to take the plot off the market while you exchange contracts. It is usually deducted from the purchase price at completion, but check whether it is refundable if the sale falls through — often it is not, or only partly.
Do I need a survey on a new-build?
A full structural survey is less critical on a brand-new home, but a snagging inspection (typically £300 to £600) before completion is strongly recommended. A professional snagger lists defects — from cosmetic finish to plumbing and electrics — for the developer to fix under the warranty before you move in.
How quickly do I need to exchange on a new-build?
Developers frequently require you to exchange contracts within 28 days of reservation. That is a tight timeline, so line up your solicitor and mortgage in advance. Missing the deadline can mean losing the reservation fee and the plot.
What warranty comes with a new-build?
Most new homes come with a 10-year structural warranty such as NHBC Buildmark, LABC or Premier Guarantee. The first two years usually cover defects the developer must fix; the remaining years cover major structural problems. Confirm the warranty is in place before completion.
What changes at key thresholds?
Compare nearby brackets before making offers. Small price moves can change tax slices and all-in completion cash.
Related content
Start with the calculator, then use scenario hubs and guides to verify assumptions before exchange.
Written and reviewed by James Whitfield and the HomeBuyingCosts editorial team.
Stamp duty, LBTT and LTT figures are checked against GOV.UK, Revenue Scotland and GOV.WALES. We explain every cost of buying a home in plain English, with worked examples. Editorial standards · About us