Off-plan purchase risks: what to check before you reserve (England & Wales)

The main risks of buying off plan are delay, a mortgage offer that runs out before the home is finished, a reservation fee you may not get back, a finished home that differs from the brochure, and an area that has changed by the time you move in. Most of these can be reduced if you read the paperwork and check the location before you sign, not after. This guide covers England and Wales only, because the buying process and some of the protections differ elsewhere in the UK.

TL;DR

• Delay is the everyday risk. Ask for a long-stop date in the contract, and check your mortgage offer will outlast a late completion.
• A reservation fee is not automatically refundable. Read the small print and keep a signed copy of the form.
• Ask which consumer code the builder follows, and get proof of the warranty (such as NHBC Buildmark) before you complete.
• Leasehold flats bring service charges and major-works costs that are not fixed by the developer’s first budget.
• You are buying a place as well as a plan. Check flood, planning next door, noise and prices around the site before you commit.

Table of Contents

• What buying off plan actually means
• Risk 1: delays, and a mortgage offer that expires
• Risk 2: the reservation fee
• Risk 3: what you get is not what you saw
• Risk 4: weaker protection than you assume
• Risk 5: leasehold costs that are not fixed
• Risk 6: price and market movement
• Risk 7: the area you cannot see yet
• A checklist before you reserve
• Our view: the contract is half the picture
• Check the area before you reserve
• FAQ
• Sources

What buying off plan actually means

Buying off plan means you agree to buy a home that is not yet built, or not yet finished, working from drawings, a specification, a show home and a sales office. You typically pay a reservation fee first, then a deposit when contracts are exchanged, and the balance on completion, which can be many months later.

That gap is where the risk sits. On a resale home, you see what you are buying and complete within weeks. Off plan, you are committing money and a legal obligation to something you cannot yet inspect, in a market that may move meanwhile.

It is worth keeping this in proportion. Government-commissioned research into new-build buyers found most participants enjoy their homes and there was no widespread buyer’s remorse over overall quality. Off plan is not a trap. It is a purchase with more moving parts, and you are no fool if you check each one.

Risk 1: delays, and a mortgage offer that expires

Completion dates on a development are estimates. Weather, supply problems, a sub-contractor failing or a planning condition can push them back by months.

The knock-on is the part buyers miss. Mortgage offers usually last a limited time, and the official How to Buy a Home guidance notes that delays can invalidate an offer because of that finite lifespan. The research behind this article puts typical validity at three to six months, so tell your lender the home is not built yet and ask what happens if completion slips.

If your offer lapses, you may have to reapply at a different rate or on different affordability terms. You could also be paying rent, or storing furniture, while you wait.

Ask for a long-stop date

A long-stop date is a point in the contract after which, if the home is still not finished, you have a right to withdraw without losing your deposit. Without one, you may be tied in indefinitely. Your conveyancer should check this clause and whether the developer can extend the date on its own. Keep it as a question for them, because the exact wording of your contract is what counts.

Risk 2: the reservation fee

A reservation fee takes the plot off the market while the legal work starts. The trap is assuming it comes back if you change your mind.

A government-published report on reservation agreements makes the point that these fees are not always refundable. In practice:

1. Read what the form says about refunds before you pay, not afterwards.
2. Find out how long the reservation lasts and what happens if the developer or your mortgage falls through.
3. Make sure you leave with a signed copy. It matters for any later dispute and for loan applications.
4. Do not let a “price rises Monday” line rush you past your own checks.

The fee itself is usually small compared with the price. The bigger cost is the time and legal fees you spend on a purchase you then abandon.

Risk 3: what you get is not what you saw

Show homes are dressed. Brochures use computer-generated images. The specification list, not the sales pitch, is what you are buying.

Before exchange, compare these against the contract:

• The specification: flooring, kitchen, appliances, glazing and what counts as an optional extra.
• Plot position: which way it faces, what sits behind it, and where bins, substations or parking courts go.
• Room sizes and layout: check dimensions, not just the artist’s impression.
• What the legal pack says about restrictions. NHBC’s guide to your new home explains that your solicitor should tell you about planning restrictions, restrictive covenants and tree preservation orders.

If the contract lets the developer make “minor” changes, ask your conveyancer what counts as minor and when you would be entitled to object.

Risk 4: weaker protection than you assume

Two layers of protection matter on a new home: the code the builder follows, and the warranty on the structure.

Consumer codes are voluntary

Builders choose whether to sign up. NHBC’s page on consumer protection codes explains that there are two schemes a builder can adopt, the Consumer Code for Home Builders and the New Homes Quality Code, both aimed at treating buyers fairly. So ask the sales team which one applies to your purchase, and ask for it in writing. These codes shape the standard of care you can expect during the sale and the snagging period.

Warranties have limits

NHBC’s Buildmark cover is a 10-year warranty and insurance for newly built homes. In broad terms it runs as two years in which the builder is responsible for defects, followed by eight years of insurance for specified major structural issues. It also includes insolvency cover after exchange of contracts. Other warranty providers exist and their terms differ, so read the policy you are actually given.

Two cautions follow:

• A warranty is not buildings insurance. You still arrange that yourself.
• NHBC’s guidance for purchasers’ solicitors says the contract should include Buildmark cover, name who provides it, and that the builder named should be NHBC-registered. Ask your solicitor to check this and to obtain a cover note before you complete.

None of this makes snagging painless. Buyers commonly report that a developer is attentive before completion and slower once they have left the site and you are dealing with a central customer care team. List every defect in writing, with photos and dates, from the day you move in.

Risk 5: leasehold costs that are not fixed

Many off-plan purchases are flats, and flats are usually leasehold. That adds ground rent terms, a lease length, and service charges that fund the building’s upkeep.

The developer’s first service charge budget is an estimate for a brand-new building. It can change. Major works can lead to large bills, and the Leasehold Advisory Service explains that you can challenge a service charge if the landlord did not follow the correct process for issuing the demand, or if your lease does not require you to pay the charge. It suggests taking legal advice on this. You should also know your responsibilities for repairs inside your flat compared with those the landlord handles.

Before you reserve, ask for:

• the projected service charge and what it covers,
• the lease length and ground rent terms,
• any management company arrangements and who appoints it,
• whether there are charges for amenities you will not use.

England and Wales also differ in some leasehold and transaction rules, so our note on buying property in England versus Wales is worth a read if you are near the border or comparing both.

Risk 6: price and market movement

Several top-ranking guides describe off-plan homes as selling below their expected completed value. Treat that as a claim to test, not a promise. Prices can rise or fall between reservation and completion, and a lender’s valuation at completion may come in below the price you agreed, leaving you to find the gap. A valuation is a lender’s view, not a guarantee of what the home is worth.

Practical steps:

1. Look at what comparable homes have actually sold for nearby, by street and property type, rather than the developer’s asking prices.
2. Check how many other homes will come to market on the same development when it finishes. Lots of identical flats can compete with your resale or rental.
3. Ask your broker how much deposit you would need if the valuation is lower than expected.
4. Remember that you will also have costs beyond the price. The Citizens Advice guide to buying a home lists survey and valuation fees and Stamp Duty Land Tax in England among them, and Wales has its own Land Transaction Tax.

Risk 7: the area you cannot see yet

This is the risk most guides skip. When you buy off plan, the neighbourhood around it may be half-finished too: more phases next door, a road that is not yet open, building noise for years, schools that are already full.

So check the place, not just the plan:

• Planning next door. Are there other applications near the site, or later phases that could block a view or add traffic?
• Flood. A new build can still sit in a flood zone or an area with recorded floods. Our guide to understanding flood risk data explains what the maps do and do not tell you.
• Crime and noise. See how we suggest assessing neighbourhood safety before you rely on a sales office’s description.
• Nuisance sites, broadband and commute. These are rarely in the brochure. Our piece on checking local amenities covers the basics.

The reason is simple: a listing or sales brochure shows you the best angle. We explain why standard listings hide risks, and the same logic applies to a development’s marketing.

A checklist before you reserve

For a wider version of this list, see our property due diligence checklist and the piece on identifying hidden property risks before you offer.

Our view: the contract is half the picture

We look at addresses all day, and the pattern with off-plan buying is consistent. People put plenty of energy into the legal side, which is right, and very little into the ground the building stands on. Yet the two risks are different. A conveyancer can tell you what a clause means. They are not there to tell you how many flood events are recorded on the street, what has been sold nearby, or whether a planning application next door will put a crane outside your window for two years.

That gap is the one we work in. Our reports use official data, and from the Area Report upwards a named person reads the result against your own written brief and deal-breakers. We are clear about the limits: it is not a survey, it does not read legal title or contract terms, and it is not financial, legal or mortgage advice. It cannot tell you whether the home will be built well, either. It is one more set of facts to set beside the ones your professionals give you.

On off-plan specifically, our hedged advice is this: treat the developer’s price list as an opening position, compare it with real local sales, and decide your walk-away point before you stand in the sales office.

— Gracie C

Check the area before you reserve

If you have a development in mind, you can run its postcode through our reports for England and Wales. The £9 Instant Report is generated from the postcode and covers sold prices by street and type, planning next door, flood detail and recorded floods, crime, noise, nuisance sites, broadband and commute, with a plain-English verdict. The person-checked Area Report (from £19) is read by a named person against your brief and adds an indicative read of whether the asking price looks fair against local evidence. Start at NoFooly, or read whether a property risk report is worth it first.

FAQ

Are off-plan properties cheaper?

Sometimes the headline price is lower than a comparable finished home, but that is not guaranteed and it is not the full picture. Add the costs of delay, possible valuation shortfalls and service charges. Compare the price with recent sales of similar homes nearby, not with the developer’s own price list.

Can I get my reservation fee back?

It depends on the reservation agreement. Government-published material warns that these fees are not always refundable, so read the refund terms before paying and keep a signed copy of the form. Your conveyancer can explain what the wording means for you.

What happens if the home is not finished on time?

Your options depend on the contract. A long-stop date can give you the right to withdraw without losing your deposit once it passes. Meanwhile, speak to your lender early, because a mortgage offer has a limited life and may need to be renewed.

Does a new-build warranty cover everything?

No. With NHBC Buildmark, for example, the builder is responsible for defects in the first two years and insurance covers specified major structural issues for the following eight. It does not replace buildings insurance, and other providers’ terms differ, so read your own policy.

Is the NoFooly report a survey?

No. It is a plain-English area report from official data for England and Wales. It does not check building condition, legal title or contract terms, and it is not financial, legal or mortgage advice.

Sources

• How to buy a home, GOV.UK
• Reservation agreements report, GOV.UK
• Housebuilding consumer research, GOV.UK
• Guide to your new home, NHBC
• Consumer protection codes, NHBC
• Buildmark cover, NHBC
• Purchaser solicitor guidelines, NHBC
• Challenging service charges, Leasehold Advisory Service
• Repairs and maintenance in leasehold properties, Leasehold Advisory Service
• Buying a home, Citizens Advice

Recommended

• Identifying Hidden Property Risks Before You Offer (England & Wales)
• Why Standard Property Listings Hide Risks
• Property Due Diligence Checklist for Buyers (England & Wales)
• How to Check Local Area Amenities Before Buying (England & Wales)