The full cost picture
Auction legal packs involve costs at every stage — and most buyers only discover the full picture after they have already committed to several of them. This guide sets out every fee, who pays it, when it is incurred, and how to reduce the cost of due diligence before you are legally bound to complete.
Cost 1: Seller's legal pack preparation (£200–£400+VAT)
The seller's solicitor assembles the legal pack before the auction. This covers obtaining office copies of the title register and title plan from HMLR, drafting the Special Conditions of Sale, and compiling any additional documents — lease, searches, EPC, Property Information Form. Complex titles with multiple legal issues cost more.
This cost is borne by the seller, not the buyer. However, sellers sometimes pass this cost on to the buyer via a clause in the Special Conditions of Sale — "the buyer shall reimburse the seller's preparation costs of £X on completion". This is legal and binding if disclosed in the pack. Always check the Special Conditions before bidding. See our hidden costs guide for real examples of this clause.
Cost 2: Buyer's pre-bid solicitor review (£350–£550+VAT)
A conveyancing solicitor reviews the title, searches, and Special Conditions before the buyer bids. This is advisory — no conveyancing work has started.
Leasehold packs are larger — typically 200+ pages including the lease — and cost more to review. The solicitor checks the lease length, ground rent, service charge, and covenants in addition to the standard title and search review.
When packs are released close to the auction date (2–5 days before is common), a same-day or next-day turnaround carries a significant premium. Not all firms offer this service regardless of the surcharge.
According to Property Solvers research across 10 UK conveyancing firms, the average charge for a pre-bid auction legal pack review is £429+VAT. Including VAT, most buyers pay £420–£720 all in — and this fee is payable regardless of whether they bid or win.
A buyer who pays a solicitor to review a legal pack, then decides not to bid after reading the report, has still paid the review fee. A buyer researching three lots before the auction pays this fee three times — potentially £1,200–£2,000 — even if they only bid on one. See our detailed guide on how much solicitors charge to review a legal pack.
Cost 3: Full auction conveyancing (£800–£1,500+VAT)
Once the hammer falls and contracts are exchanged, the buyer must instruct a conveyancer to handle the legal completion within 20–28 working days. This covers title verification, financial searches, HMLR registration, SDLT return, and all completion formalities.
Auction conveyancing is significantly more demanding than private treaty conveyancing because of the compressed timeline. The standard 20–28 working day completion period leaves very little room for errors, and conveyancers who specialise in auction work typically charge a premium. Add the pre-bid review fee (if instructed separately) to the full conveyancing fee for the total legal cost.
Other buyer costs at auction
Beyond solicitor fees, auction buyers face several additional costs that should be factored into the maximum bid:
- Buyer's premium — the auctioneer's fee, typically £1,000–£2,500+VAT, payable on the day
- SDLT (Stamp Duty Land Tax) — on the full purchase price, at standard residential or additional dwelling rates
- Seller's legal fees — sometimes disclosed in Special Conditions, can be £1,500–£10,000+VAT mandatory on completion
- VAT on the purchase price — applies to some commercial and mixed-use lots, adding 20% to the headline figure
- 10% deposit — payable on the day of auction; lost if you fail to complete
The full cost stack — a real example
| Cost item | Typical amount | When paid |
|---|---|---|
| Solicitor pre-bid review | £429+VAT = ~£515 | Before auction |
| Buyer's premium | £1,500+VAT = £1,800 | Day of auction |
| 10% deposit | 10% of hammer price | Day of auction |
| SDLT | Varies by purchase price | On completion |
| Seller's legal fees (if in Special Conditions) | £0–£10,000+VAT | On completion |
| Full conveyancing | £800–£1,500+VAT | On completion |
On a £150,000 auction purchase with no seller legal fee clause and a standard buyer's premium, a buyer could spend £3,000–£5,000+ in legal and acquisition costs before the purchase price. On a leasehold flat with £5,000 of seller legal fees buried in the Special Conditions, the costs increase substantially.
Conveyancing at auction: exchange happens immediately
The key fact that makes pre-bid due diligence non-negotiable at auction is this: when the auctioneer's hammer falls, contracts are exchanged immediately and the sale is legally binding. There is no cooling-off period, no right to renegotiate, and no recourse if you discover a problem afterwards.
Completion must happen within the timescale set in the legal pack — typically 20–28 working days. If you fail to complete, you forfeit your 10% deposit and may face further legal action for the seller's losses. There is no mechanism to pause or withdraw once you have bid.
This means all your due diligence — reviewing the legal pack, arranging finance, assessing condition — must happen before the hammer falls, not after. The legal pack is your only information. If you have not read it, you are buying blind.
LegalPack AI: the £9.99 first-pass screen
LegalPack AI sits at the very beginning of the due diligence process — before the solicitor review, and before any significant costs are incurred. Upload the auction legal pack (PDF, ZIP, or multiple files) and receive a structured risk report in 3–4 minutes covering:
- Title defects, restrictions, and charges that affect mortgageability
- Special Conditions — every hidden cost, shortened completion period, VAT clause, overage, and seller legal fee requirement
- Lease length and ground rent (with flag if under 80 years)
- Search dates and whether any searches are expired
- Missing documents that should have been provided
If LegalPack AI flags a short lease, mandatory seller legal fees of £8,000, or a title with no guarantee — you can decide not to bid before spending £350–£550+VAT on a solicitor review. If the pack is clean, you proceed with confidence and instruct a conveyancer knowing the fundamentals are sound.
| Plan | Price | Best for |
|---|---|---|
| Pay As You Go | £9.99 per pack | Occasional buyers screening packs before deciding whether to instruct a solicitor |
| Standard | £69.99/month | Active investors reviewing up to 30 packs per month |
| Pro | £149.99/month | High-volume investors and sourcing agents reviewing up to 100 packs per month |
Screen before you spend on solicitors
LegalPack AI reads every page of your auction legal pack in minutes — flagging hidden costs, title defects, and deal-killers before you commit to solicitor fees or the auction room. From £9.99.
Analyse Your Legal Pack for £9.99 →Frequently asked questions
How much does an auction legal pack cost to prepare?
Sellers typically pay £200–£400+VAT for a solicitor to prepare an auction legal pack, depending on title complexity and whether searches need to be commissioned. This covers obtaining office copies of the title register, compiling the Special Conditions of Sale, and organising searches. Sellers sometimes pass this cost to the buyer via the Special Conditions.
How much does a solicitor charge to review an auction legal pack?
Solicitors typically charge £350–£550+VAT for a freehold legal pack review and £400–£600+VAT for a leasehold review. According to Property Solvers research across 10 UK firms, the average charge is £429+VAT. Same-day expedited reviews add £150+VAT on top. Including VAT, most buyers pay £420–£720 for a pre-bid solicitor review — regardless of whether they bid.
What does auction conveyancing cost in full?
Full auction conveyancing — the legal work required to complete the purchase after winning a lot — typically costs £800–£1,500+VAT depending on property value and complexity. This is in addition to any pre-bid legal pack review fee. Buyers also face SDLT, auctioneer's buyer's premium (£1,000–£2,500+VAT), and any seller legal fees in the Special Conditions.
Is there a cheaper way to review an auction legal pack before bidding?
Yes. LegalPack AI reads every document in an auction legal pack in 3–4 minutes and produces a structured risk report for £9.99. Use it as a first-pass screen before deciding whether the pack warrants a full solicitor review. If LegalPack AI identifies a short lease or £8,000 of mandatory buyer fees, you save the £350–£550+VAT solicitor review fee on a property you were going to walk away from anyway.