Buying a Property at Auction

Buying at auction is a completely different buying process — faster, more legally committed, and often cheaper than open-market sales, but with significantly more risk. You typically have 28 days from the fall of the hammer to complete, meaning traditional mortgage applications rarely work. Most auction buyers use bridging finance, cash, or fast-track mortgage products.

This guide covers both auction formats (traditional vs "modern method"), how to finance an auction purchase, what due diligence matters before bidding, and the common traps that catch first-time auction buyers.

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Traditional Auction vs Modern Method

There are two very different auction formats in the UK now:

Traditional auction (unconditional)

The hammer falls → contracts are exchanged immediately
10% deposit paid on the day
Completion within 28 days (sometimes 14)
No cooling-off period
If you don't complete, you lose the 10% deposit and can be sued for the difference if the property resells for less

Used for: repossessed properties, auction specialists (Allsop, Savills, Barnard Marcus), properties that need fast sales, unusual or non-standard properties.

Modern Method of Auction / Online Auction (conditional)

The hammer falls → you pay a reservation fee (typically 4-5% of the price)
56 days to complete (28 to exchange, further 28 to complete)
Reservation fee is non-refundable if you pull out
Gives you time to arrange a standard mortgage
More buyer-friendly but more expensive in fees

Used for: regular properties that might otherwise sell on the open market — increasingly popular since 2020 as sellers look for faster sales than traditional estate agents.

Which is it? The auction catalogue will state whether it's "unconditional" (traditional) or "conditional" / "modern method." This fundamentally changes your financing options and timelines.

Financing an Auction Purchase

Cash

The cleanest route. You confirm the funds are liquid and ready, bid within your budget, pay 10% on the day and 90% within 28 days. Most traditional auction buyers are cash buyers for this reason.

Mortgage (standard process)

Only viable for modern method auctions (56-day completion) where you have time for a standard application. Not typically viable for traditional 28-day auctions — most lenders can't approve and fund within 28 days.

Mortgage with pre-approval

If you have a formal mortgage offer in place (not just a DIP) before the auction, some lenders can push through a traditional 28-day completion. Requires exceptional coordination and a responsive lender. Rare.

Bridging finance

The most common route for traditional auctions. A bridging lender gives you a short-term loan (typically 6-24 months) to complete the purchase, which you then refinance onto a standard mortgage or sell the property.

Typical bridging terms:

Up to 75% LTV of purchase price (sometimes 70%)
Interest rates: 0.5-1.0% per month (so 6-12% per year — expensive)
Arrangement fee: 1-2% of loan amount
Exit fee: sometimes 1% of loan amount
Approval timeline: 5-10 working days, sometimes faster

Example: buy a £200,000 property at auction. 25% deposit (£50,000) + £150,000 bridging loan. Hold for 6 months while arranging a standard BTL or residential mortgage. Total bridging cost: ~£9,000-£14,000 depending on specific terms.

Second-charge / specialist mortgages

Some specialist lenders (Precise, Together, Kensington) offer faster-track mortgage products specifically for auction purchases. Rates are higher than mainstream but approval times can match 28-day timelines.

Before the Auction — Due Diligence

Because you're committed immediately on the fall of the hammer (traditional auction), all your due diligence must happen before bidding.

Get the legal pack

Every auction property has a legal pack containing:

Title deeds
Special conditions of sale
Searches (local authority, environmental)
Leasehold documents if applicable
Any planning permissions, breaches, or issues

Download it for free from the auction catalogue. Have a solicitor review it before bidding. Typical cost: £150-£300 for a pre-auction legal pack review.

Commission a survey

Time permits — most auctions publish catalogues 2-4 weeks in advance. Commission a Level 2 or Level 3 survey before the auction. Typical cost: £500-£1,000.

Viewings

Most auction properties have set viewing windows (often 2-3 specific dates). Attend if at all possible — many auction properties are in poor condition or need significant work.

Know the "guide price" vs "reserve price"

Guide price — the auctioneer's estimate of where it may sell
Reserve price — the minimum the seller will accept (usually kept confidential, sometimes within a range of the guide)

Properties can sell for 10-20% above the guide if bidding is competitive. Set your own max before bidding and don't exceed it.

Check for special conditions

Many auction properties come with unusual legal conditions baked into the sale:

Buyer pays seller's fees (often thousands extra)
Property sold "as seen" — no warranties on condition
Tenants in situ — you inherit existing tenants and their contracts
Retentions or restrictions — limits on what you can do with the property
Short leases (flats) — may need immediate extension costs
Environmental issues — contamination, flooding, mining

Your solicitor flags these in the pre-auction pack review. Some conditions are deal-killers; others just need factoring into your price.

On the Day

Registering to bid

You'll need to register with the auction house, provide ID, and sometimes a deposit verification (proof you can pay 10% on the day). Some auctions let you bid online, by phone, or by proxy.

The bidding process

The auctioneer opens bidding, increments typically rise by £1,000 at low values and £5,000+ at higher values. Bid decisively — hesitation signals weakness.

Common mistake: getting caught up in the room and bidding above your pre-set limit. Set your max, write it down, stick to it.

When the hammer falls

You sign the memorandum of sale immediately, pay the 10% deposit (usually by card or bank transfer), and the 28-day clock starts. You're legally bound. No backing out.

If you don't win

No cost (unless you paid a pre-auction legal pack fee). Move on.

After the Auction

Day 1-2: Confirm your finance

Call your bridging lender or mortgage broker immediately. They'll need the memorandum of sale to proceed.

Day 3-7: Instruct your solicitor

Your solicitor takes over the legal work — contract review, searches (if not done pre-auction), coordination with the auction house.

Day 14-21: Finance confirmed

Your lender issues final mortgage/bridging approval. Solicitor prepares for completion.

Day 28: Completion

Funds transferred, property legally yours. If you miss the 28-day deadline, you forfeit your 10% deposit and potentially face damages if the property is resold for less.

Common Traps

Hidden costs in the legal pack

Buyer's premium (2-3% of the hammer price, paid to the auction house), seller's legal fees you've agreed to cover, contribution to seller's search costs. Can add £5,000-£15,000 to the purchase. Read the legal pack carefully.

Tenants in situ

Some auction properties are sold with existing tenants you inherit. You gain the rental income but can't get possession without going through the legal eviction process. Not automatically a problem but affects your plans.

Short leases

Flats with leases under 80 years need urgent extension, which can cost £10,000-£30,000+ above the purchase. If you didn't notice the lease length in the pack, you could bid at open-market prices for a property that's actually worth much less.

Non-standard construction

Concrete prefabs, steel frames, timber frames, cob walls — often sold at auction because mainstream lenders won't lend on them. Fine for cash buyers but hard to remortgage later and harder to resell.

No warranties

Virtually all auction sales are "as seen." If the roof leaks, electrics are dangerous, or there's subsidence, the risk is yours. No seller comeback after the hammer falls.

Finance falling through

If your bridging application is declined after auction, you're still legally committed. Have finance pre-approved (at least in principle) before bidding.

When Auction Makes Sense

Auction-appropriate scenarios:

Experienced investors buying refurbishment projects
Cash buyers looking for below-market prices on unusual properties
Properties you couldn't find at a price you like on the open market
Buyers with established bridging/specialist lender relationships

Auction-inappropriate scenarios:

First-time buyers looking for a standard home (too much risk)
Anyone who needs a standard mortgage and can't arrange bridging
Buyers who won't have legal packs reviewed before bidding
Emotional buyers who can't stick to a pre-set maximum

Frequently Asked Questions

How long do I have to complete an auction purchase?

Traditional unconditional auctions: 28 days from the fall of the hammer (sometimes 14). Modern Method of Auction: 56 days typically (28 to exchange, further 28 to complete). Always check the specific terms in the legal pack for the property.

Can I get a mortgage for an auction property?

For modern method auctions with 56-day timelines, yes — standard mortgages work. For traditional 28-day auctions, mainstream mortgages rarely process fast enough. Most traditional auction buyers use bridging finance, specialist mortgage products, or cash.

What is a reserve price?

The minimum price the seller will accept. Usually kept confidential but the auctioneer's "guide price" is typically within 10-15% of the reserve. If bidding doesn't reach the reserve, the property is withdrawn unsold.

Do I need a solicitor for an auction purchase?

Yes. You need a solicitor to review the legal pack before bidding (highly recommended) and to complete the transaction within the 28-day (or 56-day) window. Budget around £1,200-£2,000 for auction conveyancing — slightly more than standard because of the time pressure.

What happens if I can't complete in 28 days?

You forfeit your 10% deposit. The seller can then re-market the property; if it sells for less, they can sue you for the difference (this is called "forfeiture and damages"). This is the biggest single risk of traditional auctions — always have finance pre-approved before bidding.

Are auction properties always cheap?

Not necessarily. Repossessions and distressed sales often sell at 10-20% below market. But popular auction properties (especially in London) often sell above comparable open-market prices because of bidding wars. Do your own valuation based on sold-price comparables.

What's a bridging loan?

A short-term loan (usually 6-24 months) used to fund an auction purchase before you arrange long-term finance. Typical rates: 0.5-1% per month. You pay it off by refinancing onto a standard mortgage, selling the property, or using other funds. Essential tool for traditional auction buyers without cash.

Can I back out after winning the bid?

Traditional auctions: no. Contracts are exchanged on the fall of the hammer. You're legally bound to complete or forfeit your deposit. Modern method auctions: you can back out but you lose the reservation fee (typically 4-5% of the purchase price). Both are stricter than open-market sales.

Written by a CeMAP qualified mortgage advisor

Last updated: April 2026