The reality of property is that sunk costs are part of the game. In 2025, I had 8 deals fall through for various reasons — and every single one involved paying a solicitor to review an auction legal pack for a deal that never happened. Spray foam loft insulation. A seller who suddenly tenanted his property mid-process. Quite a few damp ones in between. When I added it all up, I was looking at upwards of £7,000 in abortive costs across those eight deals — solicitor fees, search fees, surveys commissioned, time spent.

That is not a complaint. It is the cost of doing business in this market. But it made me think seriously about where that money was going and whether any of it could be avoided.

What Does Auction Legal Pack Review Actually Cost?

When you instruct a solicitor to review an auction legal pack before bidding, you are typically looking at £300–750 depending on complexity. Leasehold reviews cost more than freehold. Packs with unusual title arrangements cost more than straightforward ones. If the auction is next week and you need a quick turnaround, add a premium.

That fee covers a solicitor reading the documents, flagging any issues, and giving you a written report on whether the title is clean, what the Special Conditions say, and what risks you are taking on. It is genuinely useful. The problem is the timing.

In an auction environment, you need that review done before the auction. Which means instructing a solicitor, waiting for them to triage their inbox, waiting for their report, and then — if they flag something — going back and forth to understand whether it is a dealbreaker or manageable. That process routinely takes 5–7 working days for a thorough review. Auction catalogues are often released 2–3 weeks before the auction. The maths barely works if you are looking at one property. If you are looking at five, it does not work at all.

The Legal World Hasn't Caught Up With AI

It is still genuinely frustrating that we pay solicitors to do work that AI can now do to a very high standard. The legal profession's billing model is based on time, and reviewing a legal pack is a time-intensive task that commands fees accordingly.

I am not suggesting you skip a solicitor. You absolutely still need one before you complete on a property — the stakes are too high and the legal liability too significant to go without professional advice on the final deal. But what I started questioning was whether a solicitor needs to be the first set of eyes on every pack, every time.

Building a Better Triage Tool

When I first started feeding auction packs into a general AI model, the results were mediocre. It could summarise the basics, but it lacked the nuance of a seasoned property professional. It would take quite a lot of prompting and iteration to get to anything resembling a risk report.

That is why I stopped thinking in terms of generic AI and built a purpose-built auction pack reader, trained on the real packs I was already reviewing for my own buying decisions. When you work with your own tool, you can adapt it to make sure it doesn't hallucinate — which is the equivalent of someone panicking and making something up when they're asked a question they don't know the answer to.

The tool I built is on a more capable AI model than your standard office assistant — one that is significantly better at parsing large volumes of legal paperwork. It has also been given a review by a legal expert. It now enables me to get back to the auction house with the specific questions I need to complete due diligence properly.

The Three-Outcome Triage

Every pack I look at now goes through a three-outcome triage before I spend any money:

Pass — pack looks clean, no obvious red flags, worth instructing a solicitor for a full review before bidding.

Conditional — there are issues but they may be manageable. Specific questions to raise with the seller's solicitor before bidding. Solicitor instruction is still needed but the brief is now focused, not general.

Fail — the pack has fundamental problems. Short lease, missing title, problematic Special Conditions, undisclosed structural issues. Don't instruct a solicitor. Don't bid. Move on.

The triage costs £5. The solicitor review costs £300–750. The maths of doing the triage first is straightforward.

For a full checklist of what to look for across both freehold and leasehold packs, the property auction due diligence checklist has everything in order. And if you want to understand what the most common dealbreakers actually look like inside a pack, 7 red flags in auction legal packs goes through them one by one.