Doulton Bridging Finance
New Build Mortgage Guide

New Build Mortgage Guide 2026 — A to Z: Everything You Need to Know

New build mortgage guide 2026 — LTV rules, all schemes, off-plan, EWS1, incentives, warranty, rates, deposit. Every question answered. Doulton Bridging Finance.

A new build mortgage works differently from a resale mortgage in five important ways: lower LTV limits (especially for flats), developer incentive disclosure rules, offer validity requirements for off-plan purchases, site exposure limits on specific developments, and EWS1 certification requirements for flats in buildings over 11 metres. This comprehensive guide covers every aspect of new build mortgage finance — from choosing the right development and scheme, to the application process, to what happens if your build is delayed. Updated September 2026.

Get a New Build Mortgage Quote0204 6211776
1.87%
Best available rate via Own New Rate Reducer (summer 2026)
95% LTV
Maximum via Mortgage Guarantee Scheme on new build houses
28 pages
DBF's complete new build mortgage section — all linked from this guide
Whole of market
DBF accesses the full UK mortgage lender panel
NEW BUILD MORTGAGE GUIDE

The five things that make new build mortgages different

1. LTV limits: new builds carry lower maximum LTV than resale — 85%–95% on houses, 75%–85% on flats, compared with 95%+ on resale. 2. Developer incentives: all incentives must be disclosed; above 5% of purchase price, the lender reduces its valuation base, increasing the effective deposit requirement. 3. Offer validity: standard offers expire in 6 months; off-plan builds routinely take longer — specialist lenders with 9–12 month validity must be matched to longer build schedules. 4. Site exposure limits: some lenders cap how many units they will fund in a single development. 5. EWS1: flats in buildings over 11 metres require External Wall System certification from most lenders. DBF navigates all five for every new build case.

The scheme landscape 2026

Help to Buy closed March 2023. Active schemes in 2026: Mortgage Guarantee Scheme (permanent from July 2025 — 95% LTV, houses up to £600,000); Own New Rate Reducer (developer funds rate reduction to as low as 1.87%, available via DBF as approved broker); Own New Flex (3% contribution, more flexible on combining with other incentives); Shared Ownership (buy 10%–75%, 5% deposit on share); First Homes (30%–50% discount in perpetuity, limited availability); LISA (government bonus up to £1,000/year, £450,000 price cap). Deposit Unlock closed April 2026.

Off-plan mortgages — the offer validity problem

Off-plan purchases are reserved before the property is complete. The reservation agreement specifies a long-stop completion date — the latest date by which the developer must finish the build. Standard mortgage offers expire in 6 months. If the long-stop date is 12 months away, a standard lender's offer will expire before completion. The buyer must then reapply at prevailing rates — which may be higher. DBF identifies lenders with 9–12 month initial validity for off-plan purchases and matches the lender to the specific build schedule. Extension requests are also managed proactively where needed.

EWS1 and new build flats

The External Wall System (EWS1) certificate confirms that a building's external wall system is safe. Most mainstream lenders require EWS1 for buildings over 11 metres before they will lend. For new build flats in buildings over 11m, EWS1 is typically provided by the developer as part of the purchase. DBF confirms EWS1 availability before application and identifies specialist lenders who are more flexible where EWS1 is not yet available.

Snagging and the new build process

Before completing on a new build, buyers should commission a snagging inspection (£300–£600) to identify cosmetic and minor defects. A snagging list should be submitted to the developer before exchange of contracts where possible, requiring rectification before or at completion. DBF advises on the snagging process as part of the new build purchase guidance.

New Build Mortgage — Key Rules Summary August 2026

RuleHousesFlatsWhy it matters
Maximum LTV95% (MGS/Rate Reducer); 85%–90% standard75%–85% depending on lender and EWS1Determines minimum deposit required
Developer incentive threshold5% of purchase price (above this, lender reduces valuation)Same — 5% threshold applies to bothMust disclose all incentives; non-disclosure is mortgage fraud
Mortgage offer validity6 months standard; 9–12 months specialist lendersSame — but EWS1 status may delayMust match lender validity to developer long-stop date
Warranty requirementNHBC Buildmark or approved equivalentSame — plus EWS1 for buildings over 11mConfirm warranty provider and EWS1 status before application
Site exposure limitsLender caps total units per developmentSameSome lenders may be full on popular developments

Worked example

End-to-end new build mortgage process — first-time buyer, £285,000 house on Rate Reducer development:

  • 1. Reservation: Reserve property with developer. Pay reservation fee (typically £500–£1,000 — often refundable).
  • 2. Scheme eligibility: DBF confirms development is Own New Rate Reducer eligible. Confirms DBF as approved Own New broker.
  • 3. Rate comparison: Rate Reducer at 1.87% (Furness BS) vs standard 90% LTV at 4.52% (Halifax). DBF recommends Rate Reducer.
  • 4. Application: DBF submits to Furness BS with Own New Rate Reducer instruction. 10% deposit: £28,500.
  • 5. Offer: Mortgage offer issued in 3 weeks. 6-month validity — build expected in 4 months.
  • 6. Exchange: Exchange contracts. Legally committed. Deposit paid to developer solicitor.
  • 7. Completion: Build completes. Mortgage drawdown. Keys received.
  • 8. Remortgage planning: DBF contacts buyer 4 months before Rate Reducer period ends (month 20) to review remortgage options.
  • Total time reservation to completion: 4 months. Rate Reducer saving vs standard: £366/month.
The Process

How it works

01

Tell us about your purchase

Share the property details, development, scheme type (Rate Reducer, MGS, shared ownership), and your deposit. We assess your situation same working day.

02

Lender search and scheme check

We identify which lenders accept your income type, development, and property classification — including Rate Reducer and MGS eligibility where relevant.

03

Application and valuation

We manage the full application, coordinate the RICS valuation, and liaise with the developer on build schedule and offer validity.

04

Mortgage offer and completion

Once the offer is issued, we monitor build progress, manage any extensions needed for off-plan delays, and coordinate completion.

Same working day

Get a rate for your own case

The figures above are indicative and describe the best case. Send your own scenario and we will come back the same working day with terms from the lenders that actually fit it.

Enquiry type
Mortgage
About
New Build Mortgage Guide

No upfront fees on loans over £1m.

Enough detail to price it is the amount, the security, the purpose and how you plan to repay. The rest we can fill in on a call.

FAQs

Frequently asked questions

How does a new build mortgage differ from a resale mortgage?

Lower LTV limits (especially for flats), developer incentive disclosure rules, offer validity requirements for off-plan, site exposure limits, and EWS1 requirements for flats over 11m. A specialist broker who knows the new build market makes all of these manageable.

Can I get a new build mortgage with a 5% deposit?

Yes — on houses via the Mortgage Guarantee Scheme (up to £600,000) or Own New Rate Reducer on participating developments. For flats, a minimum 15%–25% deposit is typically required.

What schemes are available for new build buyers in 2026?

Mortgage Guarantee Scheme (permanent, 95% LTV houses), Own New Rate Reducer (developer-funded rate reduction — DBF is an approved broker), Shared Ownership (10%–75% share), First Homes (30%–50% discount, limited availability), and LISA (government bonus up to £1,000/year).

What is a snagging inspection and do I need one?

A snagging inspection identifies cosmetic and minor defects in a new build. It costs £300–£600 and is strongly recommended. A snagging list should ideally be submitted before exchange. The NHBC warranty covers structural defects — snagging covers everything else.

What is the NHBC warranty and does my new build have one?

NHBC Buildmark is a 10-year warranty covering structural defects. Most major housebuilders use NHBC. Smaller developers may use Premier Guarantee, LABC, or other approved providers. Most lenders require an approved warranty — DBF confirms the warranty status of your development before application.

What if my new build completion is delayed?

If your mortgage offer expires before completion, you must reapply at prevailing rates. DBF prevents this by: (1) selecting lenders with extended offer validity for off-plan; (2) requesting extensions proactively where the build is running late; (3) monitoring build progress and communicating with the lender throughout.

Next steps

Where this applies

Talk to us about

Work it out

Read next

Related finance

Explore related pages

New Build Mortgages Hub

New build mortgages 2026 — specialist whole-of-market broker. Lower LTV, scheme expertise, off-plan offer validity, Own New Rate Reducer.

Own New Rate Reducer Explained

Own New Rate Reducer 2026 — mortgage rates from 1.87% on new build properties. DBF works with Own New participating developments. Compare Rate…

New Build Mortgage Rates 2026

New build mortgage rates 2026 — best buys by LTV for houses and flats. Own New Rate Reducer comparison. Monthly payment examples. Updated September 2026.

Off-Plan Mortgages

Off-plan mortgage UK 2026 — how offer validity works, which lenders give 9–12 months, what happens if your build is delayed. Specialist broker.

Get a New Build Mortgage Quote

Send us your scenario and we will come back the same working day with indicative terms from a panel of 130+ specialist lenders, a shortlist, and a realistic timeline.

Get a New Build Mortgage QuoteCall 0204 6211776
Start Your Enquiry

Let's Find Your Best Rate

Fill in the form to get a free quote for your finance requirements. We'll search across our panel of 130+ specialist lenders and respond as quickly as possible to get you the best possible terms.

Call us directly
0204 6211776