Auction vs Private Treaty: Which Way to Buy a UK Property

The two routes

Most UK property changes hands through one of two routes:

1. Private treaty: the seller markets the property through an estate agent, buyers make offers, the seller accepts one, then conveyancing proceeds. This is the standard route and accounts for around 95% of UK transactions.

2. Auction: the property is offered at a public auction (in a room, online, or hybrid). The highest bidder above the reserve becomes the buyer at the fall of the gavel. The contract is binding immediately and completion typically follows within 28 days.

A third hybrid route, the "modern method of auction" or "online auction", combines elements of both. The buyer pays a non-refundable reservation fee at the end of an online bidding window, then has 28 to 56 days to complete with a standard mortgage.

Speed

Auction is the fastest route by a large margin. From the seller's perspective, the gap between deciding to sell and getting the cash is much shorter. From the buyer's perspective, the gap between viewing and getting the keys is much shorter.

Certainty

Auction wins on certainty too. At a traditional auction, the contract is binding at the fall of the gavel. The buyer pays a 10% deposit immediately and is legally committed to complete within 28 days. There is no opportunity to renegotiate, request enquiries, or pull out without forfeiting the deposit (and being sued for the balance).

Private treaty has no certainty until exchange of contracts, typically 12 to 16 weeks after offer accepted. Around 30% of agreed private treaty sales fall through before exchange.

Price

This is the more complex comparison. Auction has a reputation for delivering low prices to sellers and bargains to buyers. The reality is more nuanced:

• Properties sold at auction tend to be those that are difficult to sell by private treaty: probate, repossession, derelict, unmortgageable, or with legal issues. The auction discount reflects the difficulty of the property, not the auction format.
• In a competitive room, auction can deliver above-asking-price results, especially for desirable plots, period homes, or commercial property where multiple bidders are determined to win.
• Auction prices are openly visible because the bid history is recorded. Private treaty prices are visible only after sale completes.

The right route for the price depends entirely on the property type, the market conditions, and the specific competition.

Cost

Auction fees are different from estate agent fees:

• Auction commission: typically 2% to 3% of the sale price (sometimes lower for high-value lots)
• Auctioneer's catalogue and marketing: £200 to £600
• Buyer's premium: in modern method of auction, the buyer pays a non-refundable 4% to 5% reservation fee, on top of the purchase price

Private treaty fees:

• Estate agent: typically 1% to 2% of the sale price
• Conveyancing, surveys, mortgage: similar costs in both routes

For sellers, the headline auction commission is higher than estate agent commission, but the auction route delivers cash faster and with more certainty, which can offset the cost difference.

Mortgage availability

Auction is harder to mortgage. Lenders need to value the property, get the offer issued, and complete within the 28 day window. Many lenders will not even consider it. Buyers at auction either need to be cash buyers or use a specialist short-term lender (bridging finance) and then refinance to a standard mortgage after completion.

Modern method of auction has a longer completion window, which makes mortgages easier. Most mainstream lenders will lend on modern method auction purchases provided the auction terms are clearly explained.

What to check before bidding

Whether traditional or modern method, the buyer must do their due diligence before bidding because the contract is binding (or near-binding) immediately. Key checks:

1. Read the legal pack in full. Auction houses provide a legal pack with the title register, searches, special conditions of sale, and any other relevant documents. Have your conveyancer review it before bidding.

2. Visit the property in person and arrange any survey before the auction date.

3. Check the title for any unusual restrictions, easements, or charges.

4. Confirm vacant possession or note any tenants in occupation.

5. Understand the special conditions in the contract. Auction sales often have buyer-friendly or seller-friendly special conditions that override the standard SCS terms.

6. Confirm the reserve price guide. The reserve is usually higher than the guide.

For private treaty purchases, the same checks happen during the conveyancing window, but at auction they must all be completed before bidding.

Verifying the property data

Before any auction or private treaty purchase, search the address on Property Passport UK at [/search](/search) to see verified data on tenure, EPC rating, sold price history, flood risk, and listed status. This is the easiest way to spot deal-breakers before paying for surveys or attending an auction.

Check any property in seconds with Property Passport UK

Whether you are buying through Right to Buy, Shared Ownership, First Homes, or at auction, the underlying property data matters. Property Passport UK shows verified EPC, sold price history, flood risk, listed status and tenure for every one of the 19.35 million properties in England and Wales. Search any address at [/search](/search).

Related guides

• Right to Buy explained
• Shared Ownership staircasing
• First Homes scheme explained
• Buying at auction UK guide