A new home deposit contribution from a developer does not simply add to your deposit. Lenders recalculate the LTV and the mortgage changes. Here is how different contribution types are treated, what to do before you reserve, and how to avoid the traps that catch buyers out.
A new build deposit contribution, sometimes called a builder deposit contribution, is a financial benefit offered by the developer or builder to help with your purchase costs. It can be cash, paid legal fees, cashback on completion, stamp duty covered or a free upgrades package. The problem is that most lenders do not treat it as extra deposit. They treat it as an LTV adjustment, which changes the mortgage you can get. Speaking to a broker before accepting any contribution is the one thing that prevents most of the problems buyers run into.
When a developer offers you a deposit contribution or incentive package, the lender does not treat it as money in your pocket. Instead, the lender deducts the declared contribution value from the effective purchase price, which produces a higher LTV than you expected.
The practical effect: a first-time buyer with a 10% cash deposit who receives a 5% developer cash contribution is typically assessed as a 90% LTV purchase with the contribution noted separately. Not as an 85% LTV purchase. The contribution does not move you into a lower LTV band. It stays visible as a declared incentive and the maximum mortgage is calculated against your own cash deposit.
This is the bit developer sales teams rarely explain. The numbers they present assume the contribution adds to your position. The lender's assessment often works differently.
Developer sales teams present incentives as straightforward benefits. Each contribution type carries specific declaration requirements and LTV implications that can change the mortgage you are able to get. Accepting a contribution verbally or in writing before understanding the mortgage impact can leave you committed to a purchase where the finance no longer works as expected.
Each contribution type is treated differently by lenders. The declaration requirements, the LTV impact and the maximum value a lender will accept all vary by type. Criteria vary by lender and should be confirmed before any reservation is made.
A direct cash contribution to your deposit. Treated as a declared developer incentive by most lenders. The amount declared is assessed against your own cash deposit for LTV purposes.
Cash paid to you on the day of completion. Some lenders treat this differently to a pre-completion contribution, but it must always be declared. Undisclosed cashback is material non-disclosure.
The developer pays your solicitor's fees directly. Classed as a declarable incentive and included in the total package value assessed by the lender.
Developer pays your stamp duty liability. Treated as a declarable incentive with a specific market value. Included in the total declared package value for LTV assessment.
Flooring, appliances, kitchen upgrades. Each has an assigned market value. Free flooring worth £3,500 and paid legal fees worth £2,000 form part of the total declared package, not separate minor extras.
Developer buys your existing property to facilitate the purchase of a new build. A separate mortgage assessment is required. Part exchange is treated as an existing property transaction rather than a standard contribution.
There is no de minimis threshold on declaration. A £500 flooring allowance is as declarable as a £15,000 cash contribution. The combined market value of all incentives is what triggers LTV restrictions, not any individual item. Declare everything and let the lender's policy determine how they treat it.
The same developer incentive package can produce a completely different maximum mortgage depending on which lender you approach. There are three distinct approaches in the market and understanding which applies to your package is the single most important thing you can do before reserving.
| Contribution type and value | Buyer cash deposit | Lender treatment | Max LTV |
|---|---|---|---|
| Cash contribution up to 5% | 5% | 90% cap, contribution noted separately | 90% |
| Cash contribution up to 5% | 10% | 90% cap, contribution noted separately | 90% |
| Cash contribution 5% to 10% | 5% | 85% cap or decline at some lenders | 85% |
| Non-cash incentives under 5% | 10% | Noted, no LTV reduction in many cases | 90% |
| Combined incentives over 5% | 5% to 10% | 85% cap, specialist lenders needed | 85% |
Indicative only. Lender criteria vary. Confirm the treatment of your specific contribution with a broker before reserving.
A number of specialist new build lenders accept declared contributions of up to 5% of the purchase price without reducing the maximum LTV below the standard new build threshold. Where the buyer's own cash deposit independently meets the minimum, these lenders take the contribution at face value and note it without penalising the LTV. This is the most buyer-friendly approach and where a broker places applications first, subject to criteria.
Many mainstream lenders cap at 85% LTV on any new build purchase where a developer incentive of any value has been declared. A buyer with a 10% cash deposit expecting a 90% LTV mortgage may find the cap reduces the maximum advance from £225,000 to £191,250 on a £225,000 property, creating a shortfall they did not budget for. This is the single most common surprise in new build purchases and it comes from not checking lender policy before accepting the incentive.
Some lenders apply the most restrictive approach: they deduct the full declared contribution from the purchase price to produce a net figure, then advance against that net figure at the maximum LTV. A buyer purchasing at £200,000 with a £10,000 developer contribution sees the effective price reduced to £190,000. The lender then applies 90% LTV to £190,000 rather than £200,000, reducing the maximum mortgage by more than just the 5% the contribution represents. The combined deposit requirement increases substantially.
Most first-time buyers have more than one source of deposit funds alongside a developer contribution. Each combination has different implications for the maximum LTV available.
The most common combination. Most lenders require the buyer's own cash savings to independently meet the minimum deposit threshold before the contribution is factored in. A buyer receiving a 5% developer contribution still needs to have saved at least 5% themselves to access 90% LTV products. The contribution is noted separately and does not reduce the savings requirement. Use our mortgage calculator to check borrowing based on your own cash deposit figure.
A gifted deposit from a family member combined with a developer contribution requires careful lender selection. Both are non-buyer-sourced funds. Many lenders assess them individually and then combined, applying their incentive LTV restriction to the total of all non-buyer sources. A broker identifies which lenders handle the specific combination most favourably before any reservation is made.
A LISA allows first-time buyers to save up to £4,000 per year and receive a 25% government bonus of up to £1,000 per year. Most lenders treat the LISA bonus as buyer-sourced funds rather than as an external contribution, which distinguishes it from a developer incentive for LTV purposes. The LISA bonus can typically be combined with a developer contribution without triggering the same LTV restrictions as a second non-buyer source. Lender policies vary and should be confirmed before reserving.
A first-time buyer using the minimum 5% deposit on a new build who also receives a developer contribution may find the combined picture does not produce the 90% LTV they expected. Most lenders still assess the maximum LTV based on the buyer's own 5% cash deposit only. The contribution is noted separately. Where the total declared incentive package exceeds 5% of the purchase price, the 85% cap is triggered at most mainstream lenders, which requires a larger cash deposit to bridge the gap. See our 5% deposit mortgage guide for how lenders assess 95% LTV applications.
The sequence matters. Getting this wrong, even by one step, can leave you having paid a reservation fee for a property you cannot finance on the terms you expected.
Before paying any reservation fee, ask the developer's sales team for a full written schedule of all incentives being offered, with individual and combined market values for each item. Verbal incentive offers carry no declarable value and create ambiguity. A written schedule is what the broker and lender need to assess your application correctly. Without it, the lender's treatment of the package cannot be confirmed in advance.
Send the written incentive schedule to Woodhall Mortgages before paying the reservation fee. We assess the combined incentive value as a percentage of the purchase price, identify the LTV treatment applied by relevant lenders and confirm whether your cash deposit independently satisfies the minimum threshold at a lender whose incentive policy suits your package. This takes one conversation and it prevents the most common problems.
Different lenders treat the same incentive package differently. What triggers an 85% cap at one lender may be accepted at 90% by another. A whole-of-market broker identifies which lenders are most appropriate for your specific combination of deposit and developer contribution before the application is submitted.
All declared incentives are included in the formal mortgage application with the incentive schedule provided to the lender as part of the documentation. Nothing is omitted or understated. Failure to declare a developer incentive is material non-disclosure and no legitimate broker will assist with an application where incentives are not fully declared.
The solicitor manages the practical receipt of declared incentives: the timing of cash payments, confirmation of non-cash package delivery and notation of any cashback in the completion statement. The solicitor confirms to the lender that all incentive declarations match what was received. New build mortgage offer validity periods are typically shorter than standard purchases, so coordination between application, offer and completion needs active management.
Woodhall Mortgages is a whole-of-market, FCA-authorised mortgage broker (FRN 762513) based in Halifax, West Yorkshire. We advise new build first-time buyers across the UK on developer contribution structures, identifying which lenders treat each incentive package most favourably. See our new build mortgages guide, 5% deposit mortgage guide and gifted deposit guide. Broker fee: £299 on formal mortgage offer.
Woodhall Mortgages reviews your incentive schedule, identifies which lenders treat it most favourably and confirms the maximum mortgage available before you pay the reservation fee.
Get Mortgage AdviceReviews and testimonials reflect individual experiences and do not guarantee outcomes.
Woodhall Mortgages reviews your developer incentive schedule, identifies which lenders treat your specific contribution most favourably and confirms the maximum mortgage available before you pay the reservation fee. We manage the full application from initial assessment to mortgage offer.
Initial advice free. A broker fee of £299 is payable if you choose to proceed following a formal mortgage offer. This fee is non-refundable once charged. We may also receive commission from the lender. Your home may be repossessed if you do not keep up repayments on your mortgage.
Get New Build Mortgage AdviceWoodhall Mortgages is authorised and regulated by the Financial Conduct Authority (FRN 762513). As a whole-of-market mortgage broker, we consider mortgages from across the market, subject to lender criteria and product availability. This page is for general information only and does not constitute regulated mortgage advice. LTV figures, lender treatment approaches and contribution thresholds are illustrative only and vary by lender, product and individual circumstances. Developer contribution policies change. Always confirm current lender criteria with a broker before reserving a new build property. Your home may be repossessed if you do not keep up repayments on your mortgage.
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