The New Build Conveyancing Process (Simplified)

The promise of a chain-free move, pristine modern finishes, and energy-efficient technology all make buying a new property incredibly exciting. However, beneath the glossy marketing brochures lies a high-stakes legal minefield that makes the new-build conveyancing process different from your traditional purchase.

If you instruct a standard residential conveyancing solicitor, they may not be able to deliver the fast deadline required. You end up risking missing strict builder deadlines or getting stuck with expiring mortgage offers. Fortunately, navigating the conveyancing process does not have to be a gamble. By equipping yourself with our legal checklist and insider knowledge, you can secure a safe, stress-free path to completion.

How is new build conveyancing different?

Buying a new build involves a specialist journey of transferring ownership of a newly constructed or off-plan property from the developer to the buyer.

Unlike buying existing property, where legal titles are already established, a new build solicitor must audit an entirely new plot of land, review complex developer-drafted site contracts, and register the plot at HM Land Registry for the very first time.

Official figures from The Insolvency Service reveal the UK construction sector consistently experiences the highest number of business failures of any industry, with 3,803 construction firms becoming insolvent in the 12 months leading up to mid-2026. These figures show why utilising the correct legal protections and checking structural warranties during your purchase is a necessity, not an option.

Step 1: Paying the reservation fee

You pay a reservation fee (typically £500 to £2,000) to freeze the plot. Under the New Homes Quality Code, you are entitled to a refund of this fee if your circumstances change or your mortgage falls through before exchange. However, the developer may deduct reasonable administrative expenses. Before you sign, ask them to provide a written breakdown of exactly what those administrative deductions would be so there are no surprises. The developer's legal team then issues the draft contract pack, which immediately starts the high-speed 28-day exchange clock.

Step 2: Raising initial enquiries and reviewing the contract

Once the draft contract pack arrives, your solicitor will conduct an intensive review of the master site plans. Because you are buying a plot that has never legally existed before, your specialist conveyancing solicitor will raise highly specific enquiries with the developer's legal team regarding unmapped boundaries, shared infrastructure plans, restrictive covenants, and modern eco-features (such as air-source heat pumps, solar panels, and EV charging ports) to ensure their legal titles and warranties protect you long-term.

According to Law Society guidelines, your conveyancer must verify that the developer has entered into a Section 38 agreement (under the Highways Act 1980) and a Section 104 agreement (under the Water Industry Act 1991). These agreements legally ensure that the local authority and water company will eventually adopt and maintain the roads and sewers. If these are not in place, you could be left financially liable for maintaining the road leading to your new home.

Step 3: Managing mortgage offers and valuations

Securing a mortgage for a new build requires close management. Since the property is often still under construction, standard mortgage offers, which typically expire after 6 months—risk running out before completion. If builders face delays, you must act quickly to negotiate an extension with your lender, or risk losing your deposit.

Additionally, active financial schemes in 2026 must be correctly aligned with your lender. Since the original Help to Buy scheme is no longer active in England, buyers should explore alternative active programs such as the First Homes scheme(offering 30% to 50% discounts for local first-time buyers and key workers), Shared Ownership, or builder-backed incentive programs like Deposit Unlock and Own New Rate Reducer to bridge their deposit requirements safely. (offering 30% to 50% discounts for local first-time buyers and key workers), Shared Ownership, or builder-backed incentive programs like Deposit Unlock and Own New Rate Reducer to bridge their deposit requirements safely.

Step 4: Exchanging Contracts (The 28-day deadline)

While a standard freehold purchase historically permits an 8-to-12-week timeline to exchange contracts, new build developers contractually slash this window down to just 28 days from the receipt of draft contracts. You physically cannot buy a new-build property safely without a solicitor who specialises explicitly in new-build transactions, as they must expedite local authority searches and developer enquiries to meet this tight window. Within these 28 days, you legally commit to the purchase and transfer your exchange deposit (typically 10%, or 5% if utilising specific developer schemes).

Step 5: Snagging surveys and final inspections

To finalise a new build purchase safely, your conveyancing process should account for the New Homes Quality Code (NHQC). Introduced to protect buyers, registered developers must now allow you to conduct a professional pre-completion snagging survey before you legally complete. If any significant defects are found, the developer is bound by the code's strict timelines to rectify them, ensuring you do not inherit structural or cosmetic faults on your move-in day.

Step 6: Understanding Completion on Notice

Because your house is still under construction, there is no fixed move-in date at exchange. Instead, you wait for building control and your structural warranty provider (e.g., NHBC, Premier Guarantee, or LABC) to sign off the property as habitable. Once signed off, the developer serves a formal 'Notice to Complete'. This gives you and your lender exactly 10 working days to transfer the final mortgage funds and collect your keys. Missing this 10-day window can result in heavy financial penalties or the loss of your deposit.

Why you need a specialist new build solicitor

Purchasing a brand-new home is rarely a straight line. There are unique legal hazards that don't exist in traditional property transactions. To protect yourself from unexpected pitfalls, you require a specialist who knows how to navigate these hurdles safely:

• Phase 2 construction trap: Developer sales staff are paid to sell you a peaceful lifestyle. However, that beautiful green field opposite your living room window might be earmarked for coming phases.

  Expert Tip: Double check what you're signing up for

  Always cross-reference the developer’s master site plan with a comprehensive, independent Planning Report. Otherwise, you may spend your first three years living in an active construction site.

  Andrew Boast FMAAT

  CEO of SAM Conveyancing

• Mortgage expiry timebomb: Standard mortgage offers expire after 6 months. If builders suffer material or weather delays and construction takes longer, your mortgage offer will expire before the developer serves their 10-day Notice to Complete. This forces you to reapply at potentially higher market rates, risking a mortgage rejection and the forfeiture of your 10% deposit. Monitor your build timeline closely, because if it slips, your solicitor must act quickly to negotiate a mortgage extension with your lender.
• Specifications vs optional extras: Show homes are strategically fitted with premium upgrades that do not come as standard. Before reserving, ask for a comprehensive, itemised list of what is included in the base price (such as turf, fencing, carpets, and appliances). Double-check that the advertised floor plan dimensions match what is actually being built.
• Danger of undeclared developer incentives: Developers often offer incentives like Stamp Duty Land Tax (SDLT) contributions, cashback, free flooring, or upgraded kitchens to close a deal. All developer incentives must be formally declared to your mortgage lender via a Disclosure of Incentives form. Failure to declare these is a serious legal issue, as it can artificially inflate the property's valuation, leading the lender to reduce your loan-to-value (LTV) ratio or withdraw your mortgage offer entirely.
• The unadopted estate liability: Developer sales teams promote complete, modern neighbourhoods, but the infrastructure beneath your feet can be a legal grey area if left unmanaged. When purchasing a new build, a critical part of your solicitor's role is to raise specific enquiries regarding the infrastructure of the new estate. According to Law Society guidelines, your conveyancer must verify that the developer has entered into a Section 38 agreement (under the Highways Act 1980) and a Section 104 agreement (under the Water Industry Act 1991). These agreements legally ensure that the local authority and water company will eventually adopt and maintain the roads and sewers. If these are not in place, you could be left financially liable for maintaining the road leading to your new home.
• Navigating the 10-year structural warranty: Under independent regulatory frameworks like the New Homes Quality Board (NHQB) and the Consumer Code for Home Builders, developers are legally required to protect your reservation deposits via secure client accounts. If a building firm ceases trading before completion, your money is legally protected, but that's only if your solicitor has verified their compliance and ensured a 10-year structural warranty is securely in place.

Under independent regulatory frameworks like the New Homes Quality Board (NHQB) and the Consumer Code for Home Builders, developers are legally required to protect your reservation deposits via secure client accounts. If a building firm ceases trading before completion, your money is legally protected, but that's only if your solicitor has verified their compliance and ensured a 10-year structural warranty is securely in place.

The financial breakdown: Fees and hidden first-time regulation costs

The financial layout of a new build is more complex than a standard second-hand purchase. Because you are buying a plot that has never legally existed before, the legal processes are more intensive.

The build timeline and accelerating your conveyancing timeline

The standard residential home-buying process usually wraps up within 8 to 12 weeks. However, when navigating the conveyancing process for a new build, you operate on a completely different, high-pressure clock. Because developers face tight financial schedules and construction milestones can shift unexpectedly, the legal transaction is split into two distinct, high-stakes phases: a rapid 28-day sprint to legally lock in the property, and a flexible waiting window while your home is physically built. Missing a deadline means risking your non-refundable deposit, but understanding the unique mechanics of the timeline below ensures you stay firmly in the driving seat.

Reservation to exchange: Strictly 28 days (mandated by the developer’s contract).

Exchange to completion: Anywhere from 2 weeks to 12 months, depending entirely on the physical construction schedule.

Secure your move with specialist new build conveyancers

Don’t let strict developer deadlines pressure you into risky legal decisions. Ensure your deposit is protected and your contracts are watertight with our independent, CQS-accredited experts. Get a fixed-fee new build conveyancing quote from SAM Conveyancing.