Modern Method of Auction: Is It a Good Way to Sell My House?

The modern method of auction can be a good way to sell your house if speed and buyer commitment matter more to you than the last few percent of price. It is not free money, though: the buyer pays a non-refundable reservation fee of roughly 4.2%–4.5% including VAT, that fee goes to the auctioneer and estate agent rather than to you, and it usually depresses what buyers are willing to bid.

What is the modern method of auction?

The modern method of auction is an online, conditional property auction in which the highest bidder pays a non-refundable reservation fee to secure the property, then has 28 days to exchange contracts and 28 days after that to complete. It is “conditional” because the winning bid does not, by itself, create a legally binding contract to buy.

You will see the same product sold under several names. Auctioneers and estate agents use modern method of auction, conditional auction, online auction, timed auction and the branded term Secure Sale more or less interchangeably. The largest provider in the UK is iamsold, which partners with high-street estate agency branches nationwide; other providers include Pattinson, Bamboo Auctions and in-house auction arms run by the corporate agency groups.

The critical distinction from a traditional auction is what happens when bidding closes. At a traditional — or “unconditional” — auction, the fall of the hammer exchanges contracts there and then, the buyer pays a 10% deposit immediately, and completion normally follows within 20 to 28 days. At a modern method auction, nothing is legally binding at the close of bidding. The buyer has paid a large fee they will forfeit if they walk away, which is a commercial deterrent rather than a legal obligation.

How does the modern method of auction work, step by step?

A modern method of auction sale runs in five stages, and from listing to completion it typically takes about 86 days: roughly 30 days of bidding, then 56 days to exchange and complete.

1. Valuation and pricing. You agree a starting bid (the advertised guide) and a confidential reserve — the lowest figure you will accept. The starting bid is a marketing number designed to attract interest and is usually set below the reserve.
2. Legal pack preparation. Your solicitor assembles the auction legal pack: title register and plan from HM Land Registry, searches, the TA6 property information form, the TA10 fittings and contents form, and for leasehold a TA7 plus a management pack. Expect to pay roughly £300–£450 for the pack itself, on top of normal conveyancing.
3. Marketing and viewings. The property is listed on Rightmove and Zoopla alongside ordinary listings, with an auction timer. Viewings run as normal.
4. Bidding. Buyers bid online, usually over about 30 days. Most platforms use an anti-sniping rule: a bid placed in the final couple of minutes resets the clock by the same period so other bidders can respond.
5. Reservation and completion. The winning bidder pays the reservation fee immediately and signs a reservation agreement. They then have 28 days to exchange contracts and pay the 10% deposit, and a further 28 days to complete.

How much is the modern method of auction reservation fee in 2026?

Reservation fees are usually charged at 4.2% to 4.5% of the agreed price including VAT, subject to a minimum of around £6,000 to £6,600 including VAT. iamsold, the largest provider, publishes a 4.5% inc VAT fee with a £6,600 inc VAT minimum on much of its stock, and 4.2% inc VAT with a £6,000 inc VAT minimum on some.

The minimum matters more than the percentage at the lower end of the market. Because the fee cannot fall below the floor, the effective rate climbs sharply on cheaper homes.

Below roughly £146,667 the minimum fee takes over and the percentage rises with every pound the price drops. On a £100,000 terrace the buyer is handing over 6.6% of the purchase price in a fee that buys them nothing but the right to proceed.

Who pays the reservation fee, and who keeps it?

The buyer pays the reservation fee, and the auctioneer and the introducing estate agent keep it. It is not credited against the purchase price and the seller does not receive it.

This is the single most misunderstood point about the modern method of auction, and it explains most of the criticism the model attracts. Sellers are frequently told the sale is “free” or “no fee to you” because the buyer pays. That is technically true and economically misleading, for a straightforward reason: the buyer has one budget, and the fee comes out of it.

A buyer who can afford £261,250 in total and knows they must pay an £11,250 reservation fee will bid £250,000, not £261,250. The fee is real money leaving the transaction — it simply leaves via the buyer’s side of the table rather than yours. The HomeOwners Alliance estimates that modern method of auction sales achieve around 10% less than an equivalent open-market sale for exactly this reason.

It also creates an incentive worth understanding. Because the agent and auctioneer split a fee calculated on the sale price but paid by the buyer, their income is secured the moment the reservation fee is paid — whether or not the sale ever completes.

Does the reservation fee increase stamp duty?

Yes. HMRC treats an auction reservation fee as part of the chargeable consideration for Stamp Duty Land Tax, because the fee is in substance given for the property. HMRC’s Stamp Duty Land Tax Manual at SDLTM03740 sets out the treatment of auction house fees.

In practice that means a buyer agreeing £250,000 with an £11,250 reservation fee is taxed as though they had paid £261,250. A purely administrative fee — one payable simply to register or receive the legal pack, whether or not the bidder wins — is not usually chargeable, but a reservation fee tied to the winning bid is.

Stamp duty is paid by the buyer, not the seller. If you are selling, SDLT is not your cost; your tax exposure on a sale is capital gains tax, and only if the property was not your main home. But the extra SDLT still affects you indirectly, because it is one more reason a bidder shades their offer downwards.

What does the seller actually pay?

Sellers are usually quoted “no fee”, but there are real costs, and there are scenarios in which you pay and get nothing.

• Auction entry or listing fee. Some providers charge an up-front entry fee, in some cases up to around £1,000. Many waive it. Ask, in writing, before you sign.
• Legal pack. Roughly £300–£450, payable whether or not the property sells.
• Conveyancing. Normal seller’s legal fees on completion.
• Withdrawal fee. If you take the property off the market after a bid has been accepted, most reservation agreements make you liable — potentially for an amount equivalent to the reservation fee the buyer would have paid. This is the clause sellers most often miss.
• Exclusivity period. Auction agency agreements commonly tie you in for a fixed term. Check the length and the notice period.

What happens if the buyer pulls out after paying the reservation fee?

If the buyer walks away, they forfeit the reservation fee to the auctioneer and agent — and the seller ordinarily receives none of it. You get your property back, roughly two months later, with the marketing momentum gone.

This is the gap in most guides to the modern method of auction, and it is the question that matters most if you are the one selling. The reservation fee is often presented to sellers as security. It is security for the agent’s income and a deterrent against the buyer messing you about, but it is not compensation to you. Unless your agreement says otherwise in writing — and most do not — a collapsed reservation leaves you with a bill for the legal pack and nothing else.

Ask one direct question before you instruct: if the buyer defaults after paying the reservation fee, what proportion of that fee is paid to me? Get the answer in writing. If the answer is “none”, price that into your decision.

Since May 2022 the National Trading Standards material information rules have required agents to disclose price and tenure information on portal listings, and non-optional fees that a buyer must pay fall within the spirit of that regime. If a listing does not make the reservation fee obvious, that is a warning sign about the firm, not a bargain.

Modern method of auction vs the alternatives: how do they compare?

The honest comparison is not “auction versus estate agent” but a four-way trade-off between price, speed and certainty. You can generally have two of the three.

The fall-through figure is worth holding on to. TwentyEA data put the national fall-through rate at 23.7% in the first quarter of 2026, down slightly from 24.0% the quarter before — roughly one agreed sale in four, not the far higher rate often quoted. That is the benchmark any auction route has to beat to justify its cost.

Is the modern method of auction a good way to sell my house?

It is a good fit for a narrow set of sellers and a poor fit for most. It works best when the property is hard to place on the open market, when you value a fixed timetable over the last few percent of price, and when you have the holding costs to survive a failed reservation.

When it tends to work well

• Unusual or hard-to-value property — non-standard construction, short lease, ex-local authority flats above shops — where competitive bidding genuinely discovers a price an agent would guess at.
• Probate and executor sales, where a documented, transparent process and a defensible open-market price matter to beneficiaries.
• Tenanted or investment stock aimed squarely at buyers who understand auction mechanics.
• Sellers who have already tried the open market and been let down by a chain, where a committed buyer with money at risk is worth more than a higher paper offer.

When it tends to work badly

• Standard, mortgageable family homes in decent condition. These sell perfectly well on the open market; the reservation fee simply transfers value out of your price.
• Lower-value property. Below about £147,000 the minimum fee makes the effective rate punitive and shrinks your bidder pool.
• Sellers who need certainty by a hard deadline. A 56-day window that can lapse is not certainty; if you are managing repossession or a fixed completion date, a conditional process is the wrong tool.
• Sellers who cannot absorb a failed sale. If a collapsed reservation two months from now would be a serious problem, the model’s central risk sits with you.

What are the alternatives if the modern method of auction is not right?

There are four realistic routes, and the right one depends on which of price, speed and certainty you are least willing to give up.

• A standard estate agency sale gets you the best price and the least certainty. It is the right default for a straightforward home when you are not under time pressure.
• A traditional unconditional auction gets you a binding exchange on the day at the biggest discount. Suitable for genuinely distressed or unmortgageable stock.
• A genuine cash purchase gets you a fixed price and a fixed date, agreed up front, with no fee taken out of the middle. Springbok’s we buy any house service and fast sale options work this way, and there is a dedicated modern auction route if a conditional auction genuinely is the better fit for your property.
• Fixing the open-market sale you already have — often the cheapest answer. Most stalled sales are a pricing or a chain problem, and our guide to why house sales fall through covers the fixes.

Whichever route you take, compare like with like: total money in your hand on completion day, and the date you can rely on. A headline price that arrives 86 days later minus a bidder’s fee-adjusted discount is not the same offer as a slightly lower figure that completes in three weeks. Our breakdown of fees for selling a house and our independent cash buyer company reviews are a reasonable place to sanity-check any quote, including ours.