Table of Content
NatWest New Build Mortgages
NatWest moved their new build criteria in November 2025 — making them one of the most competitive mainstream lenders for new build buyers. 95% LTV on houses, 90% on flats, builder incentives up to 15% accepted, and offer extensions up to 12 months.
Decision in principle typically within 24–48 hours.
NatWest are now one of the most competitive lenders for new build purchases
Buying a new build can feel more complicated than buying an older property. Lenders differ on deposits, builder incentives, structural warranties, exposure limits and how long a mortgage offer lasts. NatWest are one of the UK’s biggest mortgage lenders and — after their November 2025 criteria update — sit firmly at the front of the pack on new build lending. This guide covers their full new build position, how they compare with the wider market, and where they’re the right choice (and where they aren’t).
Yes — particularly since November 2025 when they moved their new build criteria. NatWest now lend up to 95% LTV on new build houses (5% deposit) and 90% LTV on new build flats (10% deposit). They accept developer incentives up to 15% of purchase price — with the first 5% not impacting the loan calculation — and offer extensions up to 12 months. Income multiples ladder from 4.5× standard, to 5.5× on stronger profiles, to 6.5× for sole or joint earners on £150k+. For most buyers with at least a 5% deposit (houses) or 10% deposit (flats), NatWest are highly competitive against Halifax, Barclays, Nationwide and Santander. The main gap remains for 5% deposit buyers on new build flats, where Santander and certain specialist lenders are the route.
NatWest new build criteria at a glance
The criteria that matter most when assessing whether NatWest is the right lender for your new build purchase. Click any card for the detail.
95% LTV on new build houses (5% deposit)
Increased from 90% to 95% in November 2025. A 5% personal deposit now unlocks the full NatWest house product range. Strong fit for first-time buyers with smaller savings.
90% LTV on new build flats (10% deposit)
Increased from 85% to 90% in November 2025. NatWest now sits ahead of Halifax (85% on flats) but behind Santander and certain building societies (95% on flats).
Up to 15% accepted — first 5% doesn’t impact LTV
NatWest are one of the more generous lenders on incentives. The first 5% of incentives is accepted without any reduction to the purchase price for lending purposes. Anything above 5% is deducted from purchase price.
6 months initial, extendable to 12 months
Two 3-month extensions available. Extensions require a refreshed credit search (no additional footprint) and a new valuation, but the original product can usually be retained.
4.5× standard, up to 6.5× for higher earners
Most borrowers sit at 4.5× annual income. Stronger profiles — typically £75k+ joint income with at least 10% deposit — can stretch to 5.5×. NatWest’s high LTI tier reaches 6.5× annual income for sole or joint earners on £150k+. Higher multiples reward larger deposits and stronger affordability: the best multiples generally need both.
75% LTV (25% deposit) on BTL new builds
BTL on new builds capped at 75% LTV, with rental coverage and the usual BTL stress tests applied. Exposure limits also apply on flat developments.
25% of units on a single development
NatWest limit lending to 25% of units on a single development in England, Scotland and Wales (20% in Northern Ireland). Applies mainly to flat blocks and larger sites.
10-year structural warranty required
Accepted: NHBC, Premier Guarantee, LABC, Build-Zone, Advantage, Global Home Warranties, ABC, Protek, Castle 10, Aedis and others. Retrospective warranties not accepted.
Worth knowing: builder incentives can boost your buying power
▼You still need to put down your own personal deposit — but NatWest’s first 5% of builder incentives doesn’t reduce the purchase price for lending purposes. That means a 5% personal deposit plus a 5% builder incentive contribution toward your costs can leave you sitting comfortably at NatWest’s 95% LTV product range with money left to cover stamp duty, legal fees and moving costs. Used correctly, builder incentives improve your overall position without forcing you down an LTV band — and can sometimes unlock sharper rates by giving you headroom against the next product threshold.
NatWest vs other lenders on new build LTV
After the November 2025 criteria change, NatWest sit alongside the most generous mainstream lenders on new build houses, and ahead of most on new build flats. The main competition for 5% deposit flat buyers is Santander and certain specialist building societies.
| Lender | Max LTV — Houses | Max LTV — Flats | Notes |
|---|---|---|---|
| NatWest | 95% | 90% | Updated Nov 2025. Builder incentives up to 15%. 12-month offer validity. |
| Halifax | 95% | 85% | Strong on houses. More restrictive than NatWest on flats. Incentives up to 5%. |
| Santander | 95% | 95% | One of the few mainstream lenders offering 95% on new build flats. Best route for 5% deposit flat buyers. |
| Barclays | 95% | 85% | 95% on new build houses launched 2025. Max purchase price £600k on the 95% product. |
| Nationwide | 95% | 90% | 95% available, plus Helping Hand can stretch income multiples to 6× for eligible FTBs. |
| HSBC | 95% | 90% | Mainstream 95% offering. Rates competitive but criteria less flexible on incentives. |
| Skipton BS | 95% | 95% | Track Record mortgage offers 100% LTV for renters with no deposit — niche but useful where eligible. |
| TSB | 95% | 85% | Standard mainstream criteria. Less competitive than NatWest on flats following the Nov 2025 change. |
Criteria and product availability change frequently. Always confirm current LTV and product position with a broker before committing to a property.
Builder incentive calculator — see what NatWest will lend on
Enter purchase price and builder incentive. The calculator shows how NatWest’s “first 5% doesn’t impact LTV” rule works in practice and what your effective loan and deposit position looks like.
NatWest new build incentive calculator
Illustrative only. Real lenders run full affordability checks (income, debts, credit, term, stress tests). The calculator shows how NatWest’s incentive rule affects loan size — not what you’ll personally qualify for. Speak to an adviser for a real figure.
NatWest new build mortgage scenarios — what works in each
Click any scenario to see how NatWest handle it and how Strive structure the case.
The clearest win from the November 2025 criteria change. A 5% personal deposit on a new build house now unlocks NatWest’s full product range up to 95% LTV. On a £300,000 house this means £15,000 deposit, £285,000 loan. Combined with builder incentives (cashback, paid legals, stamp duty contribution) you can often cover the wider buying costs without dipping further into savings.
- Deposit: 5% personal minimum
- Rates: NatWest 95% LTV rates competitive with Halifax, Barclays, Nationwide at the same band
- Builder incentives: first 5% doesn’t impact the loan calculation
- Common pitfall: not factoring in the developer’s deadline — make sure offer validity aligns with build completion
NatWest’s max on new build flats is 90% LTV — so 10% deposit minimum. If you only have 5% on a flat purchase, NatWest aren’t the answer. Santander offer 95% on new build flats, as do certain building societies including Skipton. We route the case based on rates, incentive handling and exposure limits on the development.
- Lender: Santander (95% flat option) or Skipton BS
- Deposit: 5% personal minimum
- Builder incentives: Santander accept up to 5%; structure may differ from NatWest
- Common pitfall: assuming all mainstream lenders match — flats are where they diverge most
NatWest accept builder incentives up to 15% of purchase price — generous compared to most lenders. Worked example on a £300,000 house with a £45,000 incentive package (15%): first £15,000 (5%) doesn’t impact the loan calculation. The remaining £30,000 (10%) is deducted from purchase price for lending purposes, so NatWest lend against £270,000 instead of £300,000. This still leaves substantial cashback or paid costs in the buyer’s hand without breaching policy.
- Incentive cap: 15% of purchase price
- 5% threshold: first 5% has no loan impact
- 5–15% range: excess deducted from purchase price for LTV calculation
- Accepted: cashback, stamp duty, legal fees, white goods, assisted move, part exchange
- Common pitfall: developers loading the incentive heavily — over 15% and NatWest decline
New build delays are common — anywhere from a few weeks to several months. NatWest offers are valid for 6 months initially. Two further 3-month extensions are available, giving total validity of 12 months. Each extension involves a refreshed credit search (no additional credit footprint) and a new valuation, but the original product is usually retained even if market rates have moved.
- Initial validity: 6 months
- Extension 1: +3 months
- Extension 2: +3 months
- Total: up to 12 months
- Common pitfall: applying too early and exhausting validity before build completion — we time the AIP and full application against developer’s reservation deadline and target completion
NatWest cap lending at 25% of units on a single development (20% in Northern Ireland). On large flat blocks where NatWest are already heavily represented, the application can be declined on exposure grounds alone. We check development exposure before submitting — and have a panel of alternative lenders ready where NatWest are at capacity. Common alternatives: Halifax, Nationwide, Santander, depending on LTV and applicant profile.
- Limit: 25% of units (E/S/W), 20% (NI)
- Mainly affects: flat blocks and larger schemes
- Workaround: alternative lenders not at exposure cap
- Common pitfall: developer’s IFA placing all buyers with NatWest until cap hit — by reservation 25 you’re locked out
NatWest accept Buy to Let on new builds up to 75% LTV — a 25% deposit. Rental coverage must clear the BTL stress test, and applicant income requirements apply on top of rental serviceability. Exposure limits on flat developments still apply on BTL cases. Where 75% isn’t enough deposit, specialist BTL lenders such as Paragon, Aldermore and Fleet offer comparable or higher LTVs on new build BTL.
- Max LTV: 75% (25% deposit)
- Rental stress: standard NatWest BTL ICR applies
- Income: minimum £25k personal income typically required
- Common pitfall: assuming residential criteria carry across to BTL — they don’t, particularly on flat exposure
NatWest new build mortgages we’ve placed
Real cases since the November 2025 criteria update.
The Khan family — £325k Manchester new build house, 5% deposit, 95% LTV NatWest
A first-time buyer couple buying a three-bed new build in a Manchester development. Their bank had quoted 90% LTV using NatWest’s old criteria — saying they’d need £32,500 deposit. We confirmed the November 2025 update and ran the case at 95%.
Income: £64k joint · Deposit: 5% (£16,250) · Loan: £308,750 · Builder incentive: £16,250 (stamp duty + legals)
NatWest 95% LTV product approved. Builder incentive at exactly 5% — no impact on the loan calculation. Offer issued in nine working days. Reservation to offer in under three weeks.
“Our bank still thought NatWest needed 10% deposit on houses. Strive knew the criteria had changed in November — saved us £16k.”
Aisha — £245k Birmingham new build flat, 5% deposit, NatWest couldn’t do it, Santander did
Aisha was buying a one-bed new build flat in Birmingham. She had a 5% deposit and had been told to apply with NatWest. Even after the criteria update, NatWest cap new build flats at 90% LTV — meaning a 5% deposit doesn’t work. We re-routed to Santander, who lend 95% on new build flats.
Income: £42k · Deposit: 5% (£12,250) · Loan: £232,750 · Builder incentive: £8,000 (paid legals + carpets)
Santander accepted the case at 95% LTV. Builder incentive within their accepted threshold. Aisha completed within the developer’s reservation deadline.
“Two brokers told me I needed 10% on a new build flat. Strive knew Santander would do 95% on flats — I was viewing properties I’d written off.”
James & Emma — £420k Surrey new build, 10% deposit, full 15% builder incentive package
A four-bed new build in Surrey with a £63,000 incentive package (15% of price) — cashback, stamp duty, paid legals, white goods, carpets and assisted move. Two lenders had declined as the package was over their cap. NatWest accept up to 15%.
Income: £125k joint · Deposit: 10% (£42,000) · Loan: £357,000 (against effective £399k for lending purposes)
NatWest accepted: first 5% (£21,000) at face value, remaining 10% (£42,000) deducted from purchase price for the loan calculation. Couple kept full incentive benefit while staying within criteria. Offer issued in eleven working days.
“Two banks said the incentive was too high. Strive knew NatWest’s 15% cap and structured it cleanly — we got the full package.”
Tom & Hannah — £375k Leeds new build, 9-month build delay, two extensions used
Tom and Hannah reserved a new build in Leeds with a target completion of June 2025. Build delays pushed completion to March 2026 — nine months later than planned. Their original NatWest offer was due to expire mid-build.
Income: £88k joint · Deposit: 10% (£37,500) · Loan: £337,500
We managed both 3-month extensions sequentially — refreshed credit search at each stage (no additional footprint), new valuation, original product retained on both extensions. Total offer validity 12 months. Completed on the original NatWest product despite the 9-month delay.
“The build kept slipping — first by 3 months, then another 6. Strive kept extending our NatWest offer without losing the rate. Other buyers in our development lost theirs.”
Sarah — £285k London flat, NatWest exposure cap hit, Halifax took the case
Sarah was reservation number 27 on a 96-flat London development. NatWest had already lent on 24 flats — hitting their 25% exposure cap. The developer’s IFA hadn’t flagged it. NatWest declined on exposure grounds alone, not affordability.
Income: £58k · Deposit: 15% (£42,750) · Loan: £242,250 · LTV: 85%
We re-placed with Halifax (no exposure issue at the same development). Halifax 85% LTV product on a flat purchase — within their criteria. Offer issued in eight working days. Sarah completed on time.
“NatWest declined because too many other buyers had used them on the development. Strive moved me to Halifax in days — completed on schedule.”
New build mortgage specialists across NatWest and the whole market
New build mortgages aren’t standard cases. The lender pool moves on deposit, LTV, builder incentive cap, exposure limits, warranty type and offer validity — and the criteria shift more often than most buyers realise. NatWest’s November 2025 change is a good example: the criteria moved meaningfully in buyers’ favour, but most lenders, brokers and developer-tied IFAs are still quoting the old positions.
We place new build mortgages every week — NatWest, Halifax, Santander, Barclays, Nationwide, plus the specialist building societies that pick up cases the high street can’t. We track live criteria across the panel rather than going from memory, and we know how exposure limits, incentive structures and offer-extension policy play out on real developments rather than how they look in a brochure. On a new build purchase the difference between the right and wrong lender match is rarely marginal — it’s often the difference between a 5% deposit and a 15% one, or completing on schedule vs losing a reservation to build delay.
Send us the property, your deposit and any builder incentive package — we’ll come back within hours with the matched lenders and the realistic borrowing figure on each.
Active lender panel — including every major new build lender
Five-star Google reviews from clients we’ve placed
Meet Jamie
Author of this guide. Founded Strive to do mortgage advice properly — whole-of-market, broker-led, no developer ties. Hands-on with new build cases week in, week out.
Jamie founded Strive Mortgages to provide personalised, broker-led mortgage advice without the developer ties and high-street limitations most buyers run into. Over 13 years in the industry — covering first-time buyers, complex variable-pay cases, new build, BTL and specialist lending — he’s placed thousands of mortgages across every major UK lender.
Property isn’t just the job. Jamie’s worked on multiple residential renovation projects, including new build purchases of his own, which means he understands the buyer side of the process as well as the lender criteria side. That mix shows up in how Strive structure cases — practical decisions made by someone who’s actually been through them.
Outside work he’s into football and boxing, and spends his free time with family and friends.
NatWest new build mortgage FAQs
NatWest moved their new build LTV criteria in November 2025. On a new build house you now need a minimum 5% deposit (95% LTV) — reduced from 10%. On a new build flat you need a 10% deposit (90% LTV) — reduced from 15%. If you only have 5% and you’re buying a flat, Santander and Skipton are the main 95% LTV alternatives.
NatWest income multiples follow a tiered ladder:
4.5× annual income is the standard multiple available to most borrowers. 5.5× is achievable on stronger profiles — usually combined incomes of £75k+ with at least a 10% deposit. 6.5× is NatWest’s high-LTI tier, available where sole or joint income hits £150k+. The highest multiples reward larger deposits and stronger affordability — typically you need both income and deposit working together.
Full affordability checks apply alongside the multiple — debts, dependants, credit profile, term, deposit, stress tests. Combined incomes and joint applications can push borrowing significantly.
Yes — they’re now one of the strongest mainstream lenders for new build. 95% LTV on houses, 90% on flats, generous incentive policy (up to 15%), 12-month offer validity, and a high-LTI tier reaching 6.5× income for £150k+ earners. Where they’re less competitive is for 5% deposit flat buyers — that’s where Santander typically wins on LTV.
Yes — up to 15% of purchase price. The first 5% doesn’t impact the loan calculation. Anything above 5% is deducted from purchase price for LTV purposes. Accepted incentives include cashback, stamp duty contributions, paid legal fees, assisted move, part exchange, white goods, carpets and flooring.
You still need to put down your own personal deposit — builder incentives don’t replace it. But because the first 5% of incentives doesn’t reduce purchase price for lending, you can effectively combine a 5% personal deposit with builder contributions covering your wider buying costs (stamp duty, legals, moving) — and stay at NatWest’s strongest 95% LTV product range without dipping further into savings.
6 months initially, with two 3-month extensions available — total 12 months. Extensions require a refreshed credit search (no additional footprint) and new valuation, but the original product is usually retained. Useful where build completion slips.
Yes — 25% of units on a single development in England, Scotland and Wales (20% in Northern Ireland). Applies mostly to flat blocks and larger schemes. We check exposure before submitting any case to NatWest. If they’re at cap, Halifax, Nationwide and Santander are the usual alternatives.
Yes — capped at 75% LTV (25% deposit). Rental coverage and BTL stress tests apply. New build flat exposure limits also apply on BTL cases. Where 75% isn’t enough, specialist BTL lenders such as Paragon, Aldermore and Fleet are the route.
