Conveyancing on a New Build: How It Differs From Buying an Older Property

Why New Build Conveyancing Is Different

The conveyancing process for a new build property is fundamentally different from buying an existing home in ways that often catch buyers off guard. These differences are not merely procedural — they affect the risk profile of the transaction, the timeline, and the legal protections available to you.

On an existing property purchase, contracts are exchanged once both parties' solicitors have completed all searches, reviewed the title, negotiated any issues, and are satisfied that the property exists, is habitable, and can be legally transferred. Completion typically follows 4–12 weeks later.

On a new build, you are often asked to exchange contracts on a property that does not yet exist as a finished legal entity — the building may not be complete, the road may not be adopted, the estate may be only partially built, and the exact specification of your property is defined by reference to a specification document that the developer can potentially amend.

This creates a category of risk that does not exist when buying existing property: you are contractually committing to purchase something in its completed form when you cannot fully inspect what that form will be.

The Exchange Deadline Problem

Developers routinely impose exchange deadlines — a date by which you must exchange contracts or lose your reservation and reservation fee. Typical exchange deadlines are 28–42 days from reservation, regardless of how far along the conveyancing process is.

This creates pressure. Standard conveyancing searches (Local Authority, drainage, environmental) take between two and four weeks. If there are any complications — a query on the title register, an unusual planning condition, a drainage search that returns a connection issue — your solicitor may not have completed due diligence by the exchange deadline.

Developers impose these deadlines because they do not want reservations tied up indefinitely by buyers who cannot or will not proceed. But the consequence is that buyers sometimes exchange before their solicitor has completed all the enquiries they would ideally want to raise. This is a risk to you, not to the developer.

Before you reserve, ask your solicitor whether they can complete the required work within the exchange deadline. If not, negotiate an extension with the developer before you pay your reservation fee — it is much easier to get an extension before you have paid than after.

Reading the Developer's Contract

New build developers use their own standard form contracts, which are heavily weighted in the developer's favour. Your solicitor's job is to read this contract carefully and raise enquiries or negotiate amendments where it creates unreasonable risk for you.

Key clauses to scrutinise include:

**The specification clause.** Developers typically include a right to substitute materials, finishes, or appliances of "equivalent quality" if the specified items become unavailable. This is commercially understandable but must be read carefully — "equivalent quality" in a developer's contract may be interpreted more loosely than you would expect. Ask your solicitor to confirm what the specification substitution right covers and whether there are any protections for buyer notification.

**The long-stop date and delay provisions.** As discussed in the completion delays guide, these clauses govern what happens if the developer cannot complete on time. Ensure you understand precisely what rights you have, what notice periods apply, and what (if any) compensation is payable for delay.

**The escalation clause.** Some new build contracts include a price escalation clause allowing the developer to increase the purchase price if the build cost index rises beyond a specified threshold. These clauses are rare on mainstream residential sites but do appear on custom build and luxury developments. Understand any escalation provisions before you exchange.

**Estate charges and service obligations.** Many new build contracts include obligations to contribute to estate management charges for communal areas, unadopted roads, and landscaping. These obligations run with the land and bind future buyers too. Check whether the estate charge is fixed or variable, and who manages the estate company.

The Mortgage Offer Timing Challenge

Mortgage offers on new builds are typically valid for six months, extendable once to nine months with the lender's consent. Given the uncertainty of new build completion dates, buyers frequently face the situation where their mortgage offer expires before their property is ready.

Ask your mortgage broker to confirm the lender's new build offer extension policy at the time of application. Some lenders (principally those with dedicated new build mortgage products) are more flexible than others. Halifax, Nationwide, and Barclays have historically offered extensions as a matter of course for new builds; others may require a full re-application.

If your mortgage offer expires and you need to reapply, you face the risk that the product you were offered is no longer available, that the lender's criteria have changed, or — more seriously — that your personal financial circumstances have changed since the original application (change of employment, a missed payment on a credit account) in a way that affects your eligibility.

Post-Completion Conveyancing on New Builds

Conveyancing does not always end at legal completion on a new build. Several post-completion matters may remain outstanding:

**Road and sewer adoption.** If the estate roads and sewers are not yet adopted by the local authority and water company respectively at the time of your purchase, your solicitor should have ensured the developer entered into a Section 38 (highway adoption) and Section 104 (sewer adoption) agreement with the relevant authorities. These agreements take time — sometimes years — to be formally completed. Until they are, maintenance responsibility for roads and sewers remains with the developer (or management company).

**Title registration.** HM Land Registry registration of a new build often takes several months after completion. Your solicitor should notify you when registration is complete and provide a copy of the official title register entry for your records. Upload this to your Property Passport UK new build passport as it is the foundational document for any future sale.

**Lease registration.** If your new build is leasehold (common for flats), the headlease must be registered, your lease registered as a subsidiary title, and notice given to the landlord of your mortgage. Your solicitor should manage this but confirm it has been completed.