6 Types of Property Defect That Won’t Stop a Cash Buyer Completing in 2026

Some defects don’t just lower a property’s value, they make it effectively unsellable on the open market – mostly because no mortgage lender will touch it. A single scary word in a survey can send buyer after buyer running, leaving perfectly good homeowners stuck. The reassuring truth is that the very defects that terrify lenders are the ones we at Sell House Fast deal with all the time. 

Here are six that stop a traditional sale dead but won’t stop us completing, because we buy with cash and judge a property on what it is, not on what a lender’s checklist allows.

1. Subsidence And Structural Movement

Nothing empties a room of buyers faster than the word subsidence. Lenders often refuse to lend on a property with active or historic movement, or demand costly structural reports and underpinning before they’ll consider it. We buy homes with subsidence, cracked walls, and structural movement as a matter of routine. We assess the issue, price it in, and complete, without needing a lender’s blessing or making the repairs your responsibility first.

2. Japanese Knotweed

A few stems of an invasive plant can wipe thousands off a valuation and cause mortgage offers to be withdrawn outright, because lenders fear the damage it can do to foundations and drains. Sellers are often quoted eye-watering sums for treatment plans with guarantees. To us, knotweed is a known quantity. We buy affected properties, handle the remediation ourselves, and don’t require you to fund a management plan before we’ll proceed.

3. Non-Standard Construction

Homes built from anything other than brick and block, concrete prefabs, steel frames, timber frames, or the post-war designated defective types, are a perennial mortgage headache. Many lenders simply won’t lend on them, which shrinks the buyer pool to cash purchasers only. That’s us. We buy non-standard construction properties that high-street lenders reject, so a construction type isn’t a barrier to your sale, it’s just a detail we account for.

4. A Short Lease

A lease dropping below around 80 years starts to seriously affect mortgageability, and below 70 years many lenders won’t lend at all. Extending it is expensive and slow, and the shorter it gets, the worse the trap. We buy leasehold properties with short leases and factor the lease length into our offer, taking on the extension ourselves rather than asking you to sort it before completion. The ticking clock becomes our concern, not yours.

5. Damp And Timber Rot

Serious damp, wet rot, or dry rot will trigger a mortgage retention or refusal, because lenders won’t release full funds against a property with active moisture problems. On the open market this causes sale after sale to collapse at survey. We buy damp and rot-affected homes without blinking, building the remedial cost into a fair, fixed offer that won’t be renegotiated once we’ve seen the extent of it.

6. Missing Building Regulations Or Unpermitted Work

An extension without sign-off, a loft conversion with no paperwork, or alterations that never got building regs approval can all stall a conventional sale while solicitors and lenders fret over liability. Because we don’t rely on a mortgage, missing certificates don’t stop us. We take on the regularisation risk ourselves, which means you don’t have to spend weeks chasing the council or arranging indemnity cover before you can sell.

Why These Stop Lenders But Not Us

The common thread is the mortgage. Every one of these defects is a problem primarily because it makes a property difficult or impossible to lend against, and the moment you remove the lender from the equation, the obstacle largely disappears. Buying with our own cash, we’re free to take a practical view: what’s the property worth, what will the defect cost to put right, and what’s a fair offer once that’s accounted for. If your home is one that lenders keep turning down, we buy properties in any condition, and we can usually complete within a week or two.

How Selling A Defective Property To Us Works

The process is deliberately simple, because the whole point is to spare you the runaround the open market puts defective properties through. You tell us about the property and its problems, and there’s no need to soften the truth, the fuller the picture, the more accurate our offer. We make a preliminary cash offer, arrange a valuation, and confirm a formal figure in writing. That figure is the one you receive; we don’t quote high to win you over and then chip it down once a survey confirms what you already told us. You choose the completion date, we show proof of funds before you commit, and the defect that was blocking every other sale becomes, quietly, our responsibility.

What A Serious Defect Really Costs You On The Open Market

It’s worth being honest about the alternative. A property with one of these defects can sit on the market for months, attracting offers that evaporate the moment a survey lands or a lender pulls out. Each failed sale costs you time, legal fees, and often a price reduction to tempt the next buyer, who may well fall away for the same reason. Meanwhile you’re still paying the mortgage, the insurance, and the upkeep on a home you’re trying to leave. When people compare a cash offer against the open-market value, they often forget to subtract all of that. Once you do, the gap narrows considerably, and the certainty starts to look like the better bargain.

FAQs

Can I sell a house with subsidence?

Yes, we buy properties with subsidence and structural movement that mortgage lenders typically refuse. We price the issue in and complete without requiring repairs first.

Does Japanese knotweed make a house unsellable?

It makes a mortgaged sale very difficult, but not a cash sale. We buy knotweed-affected properties and handle the remediation ourselves.

Will you buy a non-standard construction property?

Yes, we buy concrete, steel-frame, timber-frame, and other non-standard homes that high-street lenders won’t touch. The construction type is simply factored into our offer.

Can I sell a flat with a short lease quickly?

Yes, we buy short-lease properties and take on the lease extension ourselves. You don’t need to extend the lease before selling to us.

Do I need to fix damp or rot before selling?

No, we buy damp and rot-affected homes and build the repair cost into our offer. There’s no need to spend money putting it right first.

What about work done without building regulations?

We buy properties with missing building regs or unpermitted alterations, since we don’t depend on a mortgage lender. We take on the regularisation risk rather than leaving it to you.