Auctions compress the entire house-buying process into one irreversible moment. In a traditional auction, the fall of the hammer is exchange of contracts: your 10% deposit is committed there and then, and completion typically follows within 28 days. No cooling off, no renegotiation after the survey, no pulling out because the searches turned something up.
That makes auctions the purest test of preparation in property. Everything a normal buyer does between offer and exchange — legal review, survey, searches, finance — an auction buyer must do before raising a hand. Done properly, auctions offer speed, certainty and occasionally genuine value. Done casually, they are the most expensive way in Britain to learn about due diligence.
Traditional auction: the hammer is exchange
In an unconditional (traditional) auction, the winning bid forms a binding contract immediately. You pay the deposit — typically 10% — on the day, plus the auctioneer’s administration fee, and you are contractually bound to complete, usually within 28 days (some contracts say 14 or 20 business days; the legal pack specifies). Fail to complete and you lose the deposit, and the seller can pursue you for further losses, including any shortfall when the property is resold.
The guide price is marketing, not a valuation — properties frequently sell well above it — and the reserve (the confidential minimum the seller will accept) usually sits near the guide. Budget from your own valuation of the property, never from the guide price.
Modern method: more time, and a fee to notice
The "modern method" (conditional auction), common on online platforms and agent-run auctions, works differently: winning gives you a reservation, not an exchange. You pay a non-refundable reservation fee — typically around 4–5% of the price, often with a minimum of £6,000 or so — and then get around 56 days to exchange and complete, which is enough time to arrange a normal mortgage. That extra time is why the modern method attracts residential buyers rather than just cash investors.
Read the fee terms with care. The reservation fee is usually paid on top of the purchase price, is generally lost if you withdraw for any reason (including a bad survey — another argument for surveying first), and — a point buyers miss — while it is not part of the price for what you pay the seller, it usually still counts towards the amount on which stamp duty is calculated. Factor the fee into your true price when deciding your maximum bid: winning at £200,000 with a £7,000 fee is buying at £207,000.
The legal pack: read it like it is hiding something
Every auction lot has a legal pack — title documents, searches (if provided), lease, special conditions of sale, and replies to standard enquiries. It is the disclosure; buying at auction means accepting its contents, warts and all. Have a solicitor review it before you bid (many will do a fixed-fee legal pack review in a few days), because packs for problem properties are often problem packs.
Special conditions deserve particular suspicion — this is where sellers move their costs onto you. Watch for:
- Buyer pays the seller’s legal fees, search costs or auctioneer charges — sums that can add thousands to the real price.
- Short completion (14 days) — brutal if your finance is not already agreed.
- Title defects, missing leases, unregistered land, restrictive covenants, or overriding interests disclosed only deep in the pack.
- Tenancies in place — you may be buying a sitting tenant, not a vacant home.
- A pack with no searches at all: you either commission your own quickly or bid blind on planning and environmental risk.
Sources: RICS — auction guidance · Propertymark — auctions
Why auction lots are cheap — sometimes
Auction catalogues are full of properties that struggle in the open market: short leases, structural movement, fire damage, unmortgageable kitchens-in-name-only, title tangles, problem tenants. The discount is compensation for a defect — your job is to identify the defect, price the cure, and check the discount actually covers it. Sometimes it does handsomely; renovators and cash buyers build businesses on exactly that. Sometimes the "bargain" is priced perfectly for a problem you have not found yet.
This is where desk research earns its keep: tenure and lease length, price history, flood risk, planning history and local sold values can be checked for pounds before you ever order the legal pack review — and a £5 data check that reveals a 62-year lease has saved you a solicitor’s fee, a survey fee and a wasted Saturday.
Fee bands are typical 2025/26 figures and vary by firm, property and region; leasehold purchases usually add a few hundred pounds of extra legal work. Illustration only.
The pre-auction fortnight: a compressed purchase
Everything must land in the two to three weeks between catalogue release and auction day. Finance deserves the earliest start: if you need a mortgage for a traditional auction, a 28-day completion means the application should be substantially progressed before you bid — and many auction lots (no kitchen, short lease, structural issues) are not mortgageable at all, which is why bridging finance and cash dominate. Know exactly how you will fund completion before you register to bid.
Shortlist lots; order data checks on each
Solicitor reads title and special conditions
Block viewings; surveyor if the numbers justify it
Cash proof, bridging or mortgage well advanced
Hammer = exchange; 10% deposit paid
Balance due — typically 28 days later
On the day: discipline beats adrenaline
Register in advance with ID and proof of funds. Set your maximum — built from your valuation, the cure costs from the survey and legal pack, and every fee — and treat it as physics, not a suggestion; auction rooms are engineered to make one more bid feel small. If a lot passes you by, note that unsold lots can often be bought immediately after the auction at the reserve, and that pre-auction offers are also common — both routes give you the same binding terms with less theatre.
One practical protection: MoneyHelper recommends confirming how the auctioneer holds your deposit and what redress applies — reputable auction houses belong to an approved redress scheme such as The Property Ombudsman, and RICS-regulated auctioneers follow its conduct standards. An auctioneer who belongs to neither is telling you something.