Vendor / Pre-Sale Damp Check
Most property sale renegotiations — and many outright fall-throughs — happen when the buyer's survey uncovers damp. By that point you have no control: the buyer's specialist quotes worst-case costs, the buyer gets nervous, and you either accept a price cut or lose the sale and start again. A vendor damp check reverses the dynamic.
We survey your property before it goes to market (or before the buyer's survey), so you know exactly what a buyer's damp specialist will find. Minor issues can be fixed cheaply in advance. Bigger issues can be disclosed upfront with a professional report and realistic costs — which reads very differently to a buyer than a nasty surprise three weeks before exchange.
Sellers of period property in London benefit most: older homes almost always show some moisture readings, and the difference between 'unknown damp' and 'professionally assessed, minor, documented' can be tens of thousands of pounds of retained asking price.
What the Vendor / Pre-Sale Damp Check Covers
- Full internal damp inspection of the kind a buyer's specialist would carry out
- Moisture profiling and identification of anything a buyer's surveyor will flag
- External defect review: the cheap fixes (gutters, pointing, ground levels) that prevent expensive-looking symptoms
- Assessment of any historic damp treatment and its documentation
- Prioritised list: what to fix before marketing, what to disclose, what needs no action
- Realistic cost context for any genuine issues, to anchor negotiations
Signs You Need This Survey
- You're selling an older or period property
- There's a known damp history or previous treatment
- A previous sale fell through after the buyer's survey
- There are visible marks you suspect a surveyor will query
- You want to justify a strong asking price with evidence
- Your agent has advised getting ahead of survey issues
Who This Survey Is For
Homeowners preparing to sell — especially period property — and landlords disposing of tenanted or ex-rental stock where condensation staining is common. It's also valuable for executors selling probate property with unknown history, and for anyone who has already lost a sale to a bad survey and wants the next one to go through.
Our Survey Process
1. Pre-market inspection
We survey the property exactly as a buyer's damp specialist would: moisture profiling, ventilation assessment, external defect review, and inspection of any areas with visible symptoms or history.
2. Buyer's-eye findings review
Findings are framed the way they'll appear in a buyer's report — because that's what matters. We tell you what will be flagged, how severe it will sound, and what it genuinely costs to address.
3. Fix / disclose / ignore strategy
Every finding is sorted into three buckets: quick pre-market fixes that remove issues entirely, items best disclosed upfront with our report and costings, and trivial items that need no action.
4. Documentation pack
You receive a professional report you can share with your agent, solicitor, or the buyer directly — turning damp from an unknown risk into a documented, quantified, and often already-resolved item.
What You Receive
- A pre-sale damp report identifying everything a buyer's specialist will find
- A prioritised fix/disclose strategy with realistic costs
- Photographic documentation of condition at the point of sale
- Evidence to support your asking price in negotiations
- A shareable professional document for agents, solicitors, and buyers
Why Choose Henderson Wood?
- Removes the surprise factor that kills sales and prices
- Cheap external fixes often eliminate scary-looking symptoms entirely
- Professional disclosure reads as transparency, not risk
- Anchors negotiation at realistic costs instead of buyer worst-case quotes
- Reduces fall-through risk and wasted marketing time
- Particularly powerful for period and ex-rental property
Frequently Asked Questions
Isn't it risky to find problems before selling — don't I then have to disclose them?
You should take advice from your solicitor on disclosure obligations, but in practice the buyer's surveyor will find genuine issues anyway — at the worst possible moment and framed at worst-case cost. Knowing first lets you fix cheaply, price accurately, or disclose professionally. Sellers lose far more money to survey surprises than to informed disclosure.
What does a vendor damp check cost?
Pricing depends on the size of the property — contact us for a fixed quote. Set against the typical £5,000-£15,000 price reduction that follows an adverse buyer's damp report, it is one of the cheapest pieces of insurance in the selling process.
Can the buyer rely on your report instead of commissioning their own?
Buyers sometimes accept a recent independent vendor report, particularly with an accompanying invoice trail for any remedial work. Even when they commission their own, yours ensures there are no surprises in it — which is the real goal.
What kind of issues can be fixed cheaply before marketing?
A remarkable share of 'damp' findings trace to external maintenance: blocked or leaking gutters, raised ground levels bridging the damp course, failed pointing, and poor bathroom extraction. These often cost hundreds to fix but produce symptoms that look like thousands in a buyer's report.
How close to marketing should I book?
Ideally 4-8 weeks before listing, which leaves time for any pre-market fixes and redecoration. But a check is worthwhile at any stage up to the buyer's survey — even a week's head start changes the negotiation.
When to Book
- • Before your property goes on the market
- • After an offer, before the buyer's survey
- • After a sale has fallen through on survey
- • When selling probate or tenanted property
- • When your agent flags damp as a marketing risk