The gavel falls, the lot is yours, and for a few seconds it feels like the hard part is over. Then the paperwork arrives. A deposit is due before you leave, completion is only weeks away, and the funding you assumed would fall into place is now running to someone else’s timetable. For many first-time auction buyers, this is the moment a good deal starts to feel like a liability.
Auctions can open the door to properties that rarely reach the open market, from tired terraces to lots that need a full refurbishment. But the financial decisions that matter most are made long before you raise your hand. Here is what to settle first.
Why Your Maximum Bid Is Not Your Budget
Many investors arrive with one number in mind: the most they are prepared to bid. That figure is only one part of the picture. Your real budget is the total amount needed to buy the property, bring it up to standard and hold it until it is let, sold or refinanced.
It helps to work backwards from the end value. Whether you are targeting an up-and-coming area like those in our look at the best Merton areas to invest in or a seaside town closer to home, research what similar finished properties actually sell or let for. Then subtract every cost covered below. What is left is the most you can sensibly bid.
Read the Auction Conditions Before You Register
Every lot comes with its own legal pack and conditions of sale, and by bidding you are agreeing to them. Propertymark’s guide to buying at auction explains how this works in practice. Most traditional auctions expect a 10% deposit on the day, and completion usually follows within 28 days. Modern method auctions work differently: you pay a reservation fee up front and get a longer window to exchange and complete.
The same guide points out that the reserve price can sit up to 10% above the guide price. A lot advertised at a tempting figure may never sell anywhere near it. Check the special conditions for anything that adds to your costs, such as paying the seller’s legal fees or outstanding service charges. Ask a solicitor to review the pack before you commit.
Add Up Every Cost Beyond the Hammer Price
The hammer price is the start of the bill, not the end of it. Typical extras include:
- A buyer’s premium, often a percentage of the hammer price plus VAT, and a separate administration fee
- Stamp Duty Land Tax. In England, if the property will not be your only home, the higher rates for additional properties apply, starting at 5% on the first £125,000
- Solicitor’s fees and searches
- Buildings insurance, which Propertymark notes you are liable for from the moment the gavel falls
- Any of the seller’s costs passed on through the special conditions
Price the Refurbishment Before You Price the Bid
Many lots reach auction precisely because they need work, and repair costs are where budgets most often slip. RICS recommends its Level 3 home survey for older or run-down properties and for those facing major works, as it describes visible defects and outlines repair options.
Viewing windows can be short, so take a builder or surveyor with you if you can, and get rough quotes before the sale. Many investors also add a contingency of at least 10% to cover what only shows up once walls are opened. If your plan involves extending or reconfiguring the layout, budget for design fees too. Our guide on whether you need an architect for an extension covers when professional input makes sense.
A Simple Example: When a Cheap Lot Stops Looking Cheap
Imagine a two-bedroom terrace in England with a guide price of £150,000. It sells for £180,000 to an investor who already owns a home. The figures below are illustrative only:
| Cost | Amount |
|---|---|
| Hammer price | £180,000 |
| Buyer’s premium (2% + VAT) | £4,320 |
| Administration fee | £1,000 |
| Stamp Duty Land Tax (higher rates) | £10,100 |
| Legal fees, searches and survey | £2,500 |
| Refurbishment | £35,000 |
| Contingency (10% of refurbishment) | £3,500 |
| Total before finance costs | £236,420 |
That is more than £56,000 above the hammer price and over £86,000 above the guide, before any interest or lender fees. £18,000 of it is due as the deposit on auction day, and most of the rest within a few weeks.
Have Your Finance Lined Up Before You Bid
This is where auction purchases differ most from buying through an estate agent. A standard purchase gives a mortgage lender time to value the property and issue an offer. David Wilson Homes’ mortgage timeline puts the valuation at one to two weeks and the formal offer at two to four weeks. That can swallow most of a 28-day completion window. Propertymark also lists unmortgageable properties among the main auction risks, and a house without a working kitchen or bathroom may not qualify for a standard mortgage in its current state.
For this reason, many investors look at short-term property finance before they bid. They use it to complete on time, then refinance onto a longer-term mortgage once the work is done. Bridging loans are the most common example. They are usually capped at a share of the property’s value, so a cash deposit or other security is normally needed. Broker pages such as rangewell.com/finance-options/100-bridging-loans describe how additional property or assets can be offered as extra security where there is no cash deposit. Whichever route you consider, compare the full cost, including interest, arrangement and exit fees. Be clear on exactly how the loan will be repaid, and take independent advice before committing.
Making Sure the Win Still Feels Like a Win Next Month
The fall of the gavel should be the end of your decision-making, not the start of it. If your total budget is set, the conditions are checked, the refurbishment is priced and the funding is ready to go, winning a lot means moving straight to completion rather than scrambling to cover the gap. Do the sums first and bid only to the number they allow.
