The auction legal pack is where deals die — not on viewing day, not after the hammer falls, but in the small print that most bidders never read carefully enough. I have lost money learning this. The red flags in auction legal packs are rarely obvious. They are buried in documents that are designed to be hard to read, written by solicitors whose job is to protect the seller, not you.

Here are the seven I see most often, and what each one actually means for your deal.

1. Buyer Pays Seller's Legal Fees (Hidden in Special Conditions)

The Special Conditions of Sale is the seller's document. It sits inside the auction legal pack and it is the most dangerous thing in there if you don't read it. One of the most common traps is a clause that makes the buyer — you — responsible for the seller's legal costs on completion.

This is legal. It is disclosed. It is your problem if you miss it.

The amount varies but I have seen clauses for £1,500 to £3,000 or more. Add that to your own solicitor's fees, the auctioneer's buyer's premium (typically 2–3% plus VAT), and any search fees also charged to you, and you can be several thousand pounds into a deal before you have done a single thing to the property.

Read the Special Conditions first. Every time. Before you look at anything else.

2. Short or Problematic Lease

Anything under 80 years remaining is a serious problem for resale and remortgage. Under 70 and you are looking at cash purchase only, or a very expensive specialist lender. Under 60 and you may struggle to sell at all to a buyer needing a mortgage.

The issue is not just the current term — it is the cost of extending. Lease extension negotiation is a legal process governed by the Leasehold Reform Act, and the shorter the lease, the more the freeholder can demand. For leases under 80 years, the calculation includes something called marriage value, which roughly doubles the cost of the extension.

Check the lease term before you bid. Factor in the extension cost. If the numbers don't work at the guide price, they definitely don't work once you have paid fees and bid competitively.

For more on what to check in leasehold packs specifically, the property auction due diligence checklist has a full leasehold section.

3. Missing or Outdated Searches

Local authority, water and drainage, environmental — these three searches are the baseline. If any are missing from the pack, that is a red flag, not an admin oversight.

Missing searches mean one of two things: the seller couldn't afford them, which tells you something about their situation, or they didn't want you to see the results, which tells you something worse.

Outdated searches — more than 6 months old at the date of auction — are also a problem. Local authority searches in particular can change quickly. A road scheme, an enforcement notice, a planning application — all of these can appear in a search that was fine 8 months ago and is now not.

If searches are missing, you can commission your own before the auction. That costs money and takes time, both of which you may not have. Or you can pass on the lot.

4. Restrictive Covenants That Kill Your Strategy

A restrictive covenant is a legal obligation on the title that restricts what you can do with the property. Common examples include: no business use, no subdivision, no external alterations without consent, no HMO conversion.

The problem is not that these covenants exist — most properties have some. The problem is that bidders buy properties with a strategy in mind, and they don't check whether the title actually allows that strategy.

If you are buying to convert to an HMO, check the title for covenants before you bid. If you are buying to extend or develop, check for restrictions on alterations. If the covenant is old enough and there has been a long history of breach, indemnity insurance may be available — but that is a conversation for a solicitor, not something to assume on the day.

5. Japanese Knotweed Without a Management Plan

Japanese Knotweed is a material fact — sellers are required to disclose it on the TA6 form. If it is disclosed, the key question is whether there is a management plan with a transferable guarantee from a specialist contractor.

Without a transferable guarantee, you are taking on an open-ended liability. Treatment typically costs £3,000–10,000 depending on severity. Mortgage lenders will not lend on properties with active knotweed without a management plan in place. If you are planning to sell or refinance, you need that guarantee.

If knotweed is disclosed but there is no management plan, price accordingly. If it is not disclosed but you saw evidence on the viewing, that is a different kind of problem.

6. Flying Freehold

A flying freehold means part of your property sits over or under someone else's land — typically where an extension, room, or garage projects over a neighbouring property. It sounds unusual but it is more common than you would think in older terraced properties.

The issue is that there is no automatic right of support or maintenance in a flying freehold situation. If the neighbour's property underneath yours needs work that affects your structure, there is no guaranteed legal mechanism to ensure it gets done properly. Mortgage lenders frequently refuse to lend on properties with flying freeholds, which severely restricts your buyer pool when you come to sell.

Check the title plan carefully. If anything looks unusual about the boundaries in relation to neighbouring properties, look closer.

7. Service Charge Arrears Assigned to the Buyer

On leasehold properties, always check whether the seller is in arrears on service charges or ground rent. In some auction sales, the Special Conditions transfer outstanding arrears to the buyer on completion. You could complete on a flat and immediately owe the managing agent £4,000 in unpaid service charges that were not yours.

This is not the norm, but it happens. The management pack or LPE1 form should disclose the current arrears position. If that document is not in the pack, request it — or assume the worst and price accordingly.

The fastest way to check a pack for all of these issues at once is to run it through AuctionPackReader. Upload the PDF, get a structured risk report in seconds — title issues, Special Conditions flags, missing documents, leasehold risks. Then you know exactly what questions to raise before you bid.

For a step-by-step guide to reading the pack yourself, see how to read an auction legal pack. And if you want to understand what the whole process costs when you add up solicitor fees and abortive deals, auction legal pack solicitor cost has the honest version.