Off-Plan Property Conveyancing UK: Buyer's Guide
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Buying a property before it has been built is a route that continues to attract both homebuyers and investors across England and Wales. The appeal is obvious: the chance to secure a brand new home at today's price, personalise the finish, and move into a property that meets modern construction standards.
But purchasing something that only exists on paper carries a different set of legal and practical considerations to buying a completed home. The conveyancing process for an off-plan purchase has its own rhythm, its own risks, and its own paperwork.
In this guide I walk through how the process works, what to look for in the contract, how your deposit is protected, and the steps most buyers follow from reservation to completion. If you are weighing up an off-plan purchase, understanding the mechanics first will help you make a more informed decision.
What this document is
An off-plan property purchase is a commitment to buy a home (or commercial unit) before construction is finished. In some cases the development is still at drawing-board stage; in others, foundations have been laid or a show home is open for viewings.
The buyer typically reserves a plot, pays a reservation fee, and then exchanges contracts with the developer within a short window, often 21 to 28 days. Completion happens later, once the unit has been built and signed off. Because you are buying something that does not yet physically exist, the contract does a lot of heavy lifting.
It sets out the specification of the finished property, the long-stop date by which it must be built, what happens if the developer slips, and how snagging issues are handled. Conveyancing on an off-plan purchase therefore places real weight on scrutinising the contract, the planning consents, the warranty arrangements, and the deposit protections, rather than the condition of a standing building.
How to use this document
- Reserve the plot and pay the reservation fee. Once you have chosen a development, you will usually sign a reservation form and pay a fee to take the plot off the market for a defined period. The fee is typically deducted from the purchase price on completion, though terms vary and some reservation fees are non-refundable if you pull out.
- Instruct a conveyancer familiar with new builds. Off-plan work is specialist. Your conveyancer will request the developer's contract pack, which normally includes draft contract, plans, specification, planning permission, building regulations approvals, warranty details, and title information. Choosing someone who regularly handles new build transactions will save you time and surprises.
- Review the contract, plans and specification carefully. This is where the real work happens. Your conveyancer will check the long-stop date, what the developer can and cannot change, the snagging process, the deposit protection arrangements, and any restrictive covenants. Raise enquiries on anything that is unclear before exchange, as your leverage drops once contracts are exchanged.
- Exchange contracts and pay the deposit. Developers usually require exchange within a tight timeframe after reservation. On exchange you become legally committed to buy, and a deposit (often 10 per cent, sometimes staged) is paid. Make sure you understand how your deposit is protected, whether through a new home warranty scheme, a bond, or another mechanism set out in the contract.
- Completion once the property is built and signed off. When the unit is finished and the developer serves notice that it is ready, completion usually takes place within a set number of working days. Your conveyancer will arrange the final searches, mortgage drawdown, balance payment, stamp duty land tax return, and registration at HM Land Registry. Snagging lists and defect periods then come into play.
Common questions
If you're dealing with this kind of situation, speak to an experienced legal adviser who can walk you through it — from £89.
Common questions
Q How long does an off-plan purchase usually take to complete?
It depends entirely on the build programme. You may exchange contracts within a month of reserving, but completion might not happen for six months, a year, or even longer if the development is in early stages. The contract should include a long-stop date, which is the latest the developer can deliver the unit before you have a right to walk away. Ask for realistic build timelines before committing.
Q What protects my deposit if the developer goes out of business?
Most reputable developments are covered by a new home warranty scheme such as NHBC Buildmark, LABC Warranty, or Premier Guarantee. These schemes typically provide deposit protection up to a specified limit if the developer becomes insolvent before completion. Always check which warranty applies, what the cover includes, and the limits, as protections vary between providers and policies.
Q Can the developer change the design after I exchange contracts?
The contract usually allows the developer to make minor variations to the design, layout, or specification, provided they do not materially affect the value or size of your unit. What counts as 'minor' is defined in the contract, so this clause deserves close attention. If changes go beyond that threshold, you may have the right to object or, in some cases, rescind.
Q Will my mortgage offer still be valid by the time the property is built?
Mortgage offers typically last around six months. For off-plan purchases where completion is further out, this is a known issue. Some lenders offer extended offers for new builds, but if your build runs long you may need to reapply, and the lending environment and your circumstances could have changed by then. Speak to a broker who understands new build timelines.
Q How does snagging work on an off-plan property?
After completion you will usually have a defined period, often two years, during which the developer must put right defects in workmanship or materials under the warranty. Major structural issues are typically covered for ten years. Many buyers instruct an independent snagging inspector before or shortly after moving in to produce a list of items for the developer to address.
Q Do I pay stamp duty land tax on an off-plan purchase?
Yes. SDLT is payable on the purchase price in the normal way, and your conveyancer will submit the return and payment to HMRC within the statutory deadline after completion. The rate depends on the price, whether you are a first-time buyer, and whether you own other property. Check gov.uk for current SDLT rates and reliefs before budgeting.
Q What happens if the developer misses the long-stop date?
If the property is not ready by the long-stop date set out in the contract, you typically have a right to rescind the contract and recover your deposit. This is one of the most important protections in an off-plan transaction, which is why the long-stop date should be realistic and clearly drafted. Your conveyancer should flag this clause and explain exactly how it operates.
If you're dealing with this kind of situation, speak to an experienced legal adviser who can walk you through it — from £89.
Sources
This guide is based on primary UK law and official guidance.
- Guidance · UK GovHM Land Registry: registering propertygov.uk
- Guidance · UK GovStamp Duty Land Tax (gov.uk)gov.uk
- Official SourceNHBC new home warrantynhbc.co.uk
Legal helpline
Thinking about buying off-plan?
Off-plan contracts, deposit protections, and long-stop dates can be hard to weigh up on your own, especially when the developer's paperwork is dense. An experienced legal adviser can help you think through the key issues based on what you describe on the call.
- Plain-English answers to your specific questions about off-plan buying
- Practical perspective on the contract points that tend to matter most
- Guidance tailored to what you describe about your development and timeline
- Clarity on what to watch out for before you commit
Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.