Damp and your mortgage, and what a retention actually involves
Damp rarely stops a mortgage. It more often changes its shape, through a retention: the lender holds back part of the money until the work is done. The steps, the re-inspection fee, the release window, and the cash-flow trap nobody mentions.
By The Damp GuyLast updated
The short version
Damp usually does not stop a mortgage. It changes its shape. The mechanism is a retention: the lender agrees the mortgage but withholds part of the funds until essential repairs are done, and damp and mould are on the standard trigger list. The catch is the direction of travel. That money is released after the work and a paid re-inspection, so you fund the repair yourself at the exact moment you have just paid a deposit and fees.
What a retention is, as a process rather than a word
It gets described everywhere as the lender holding some money back. These are the parts that actually change your plans.
A mortgage retention is when a lender agrees to give you a mortgage but withholds a portion of the funds until essential repairs or improvements have been completed. Damp and mould sit in the common trigger list alongside structural damage, roof issues, unsafe electrics, boiler problems, asbestos and spray foam insulation, all described as issues serious enough to affect the property's value or safety.
On the amount, be careful with anyone offering you a rule. The worked example in the source is a surveyor identifying roof issues on a £250,000 mortgage and a £10,000 holdback. That is one example, not a rate, and no formula is published. It is set against what the flagged work is expected to cost.
| Step | What happens | Detail |
|---|---|---|
| 1 | You collect the evidence | Invoices, photographs and completion certificates for the work. |
| 2 | It goes to the lender | Submitted by your solicitor or your broker, not by you directly. |
| 3 | The lender re-inspects | A further inspection, typically costing £120 to £200. |
| 4 | The money is released | On the surveyor confirming the standard, normally to your solicitor, within seven to 14 days. |
Two dates govern all of that and both are knowable in advance. The deadline for completing the work is set out in your mortgage offer, so it is a clause you can read before exchange. And typical repair completion timeframes run between three and 12 months from completion, which is the window most offers are written around.
The bit nobody mentions until it is happening
A retention does not fund the repair. It delays money you were already getting.
Read the four steps again in order and the cash-flow shape falls out of them. The work comes first. The evidence comes second. The re-inspection, which you pay for, comes third. The money comes fourth.
So a buyer with a retention has to fund the repair out of their own pocket, at the point in their life when they have just paid a deposit, stamp duty, legal fees and a survey. The retained sum is not help with the work. It is a portion of their own borrowing held back until the work is done, plus a re-inspection fee on top.
That is worth knowing before exchange rather than after, because it changes what the purchase actually costs you in the first six months. And it is another reason the useful move is to find out which kind of damp is on the wall early. A condensation problem and a rising damp diagnosis produce very different valuer opinions and very different holdbacks.
The valuation is not your survey
They are different instructions, done for different people, and only one of them is working for you.
The mortgage valuation exists to tell the lender whether the property is adequate security for the money it is lending. You may pay for it. It is not done for you, it does not report to you in any useful detail, and its job is not to inform your decision.
Your survey is a separate instruction. A RICS Home Survey Level 2 uses a damp meter and does not force or open up the fabric of the building, so it has its own well-defined limits, and a recommendation for further investigation is that service working correctly. But it is yours, it is written to you, and it is the one you should be reading closely.
The practical consequence is that a valuer can flag damp your surveyor discussed in measured terms, and the lender will act on the valuer. Which is the argument for settling the question early, with somebody who has no interest in the answer, rather than discovering it through a retention clause.
About this resource
The retention process, the trigger list, the worked example, the re-inspection fee, the release window and the timeframes are from Tembo Money Limited, which is authorised and regulated by the Financial Conduct Authority under registration number 952652. It is a mortgage broker, so this is an industry explanation of the mechanism rather than a regulator's statement of it, and it is reported as such.
The £10,000 holdback on a £250,000 mortgage is presented here exactly as the source presents it, as one worked example. No formula or percentage is published and none is inferred here, because a rule of thumb built from a single case is precisely the sort of confident number this site exists to distrust.
Nothing on this page describes what a named lender does. Lender policy varies and none was read at source. The RICS wording is from RICS's own published description of the Home Survey Level 2, already sourced for the damp survey pillar on this site.
This is not financial advice and it is not a recommendation about a mortgage. It explains a process so you can read your own offer and ask your broker and conveyancer better questions. This site does not survey, treat, quote or refer.
Common questions
Can I get a mortgage on a house with damp?
Usually yes, and the more useful question is on what terms. A lender that is not happy to release the full amount against the property as it stands has a standard mechanism for it: a retention, where it agrees the mortgage but withholds a portion of the funds until essential repairs are completed. Damp and mould appear in the common trigger list for that, alongside structural damage, roof issues, unsafe electrics, boiler problems, asbestos and spray foam insulation.
What is a mortgage retention?
It is when a lender agrees to give you a mortgage but withholds a portion of the funds until essential repairs or improvements have been completed. It is not a refusal and it is not a reduction in what you are borrowing. It is a timing condition: some of your money is held until the thing the valuer flagged has been dealt with and confirmed.
How much will the lender hold back?
There is no published formula and this page is not going to invent one. The worked example in the source is a surveyor identifying roof issues on a £250,000 mortgage and a £10,000 holdback, which is an example rather than a rate. The amount is set against what the flagged work is expected to cost, which is precisely why establishing which kind of damp you actually have matters before a valuer forms a view about it.
How long do I have to do the work?
The deadline is set out in your mortgage offer, so it is a document you can read rather than something you have to guess at. Typical repair completion timeframes run between three and 12 months from completion. Read that clause before exchange rather than after, because it is the thing that decides whether the plan is realistic.
How do I get the retained money released?
Four steps. You collect the evidence, which means invoices, photos and completion certificates. Your solicitor or broker submits that pack to the lender. The lender arranges a re-inspection, typically costing £120 to £200. Once the surveyor confirms the work meets the required standard, the lender releases the funds, normally to your solicitor, within seven to 14 days.
So I have to pay for the work myself first?
Yes, and that is the part worth planning for. The retained money is released after the work is done and re-inspected, which puts the bill at the exact point you have just paid a deposit, stamp duty and fees. A retention does not fund the repair. It holds back money you were going to receive until the repair is finished, and the gap in between is yours to cover.
Is the mortgage valuation the same as my survey?
No, and conflating them is a common and expensive mistake. The valuation is carried out for the lender, to establish whether the property is adequate security for the loan. Your survey is carried out for you, to tell you about the condition of the building. A RICS Home Survey Level 2 uses a damp meter and does not force or open up the fabric, and it is a separate instruction, separately paid for, that a lender does not see.
Does condensation affect a mortgage?
It is the least likely of the three to trouble a valuer, because it reads as a management issue rather than a defect in the building. The kinds that carry a repair implication are the ones that get flagged. Which is one more reason to know which of the three is on the wall before somebody with a professional opinion and a duty to a lender forms a view about it on your behalf.