Japanese Knotweed and Mortgages: What Lenders Require

Japanese knotweed is one of the few plant problems that can directly affect whether a property can be mortgaged. It is not the plant alone that causes the difficulty — it is what lenders and surveyors do when they find it. This guide explains it plainly for Scottish sellers.

Why lenders care

Knotweed spreads aggressively and can exploit weaknesses in structures and hard surfaces. When it is noted in a home report or spotted by a surveyor, the lender treats the property as carrying a risk. Until that risk is documented and managed, many lenders will not lend.

What lenders typically require

Most mainstream lenders will proceed if one of the following is in place:

1. A professional treatment plan with an insurance-backed guarantee — showing the knotweed is being controlled and that any regrowth within the guarantee period is funded.
2. Evidence of full excavation and removal — the knotweed dug out and disposed of legally, with documentation.

A treatment plan *without* a recognised insurance-backed guarantee often will not satisfy them, which is the most common reason a knotweed sale stalls.

Selling with knotweed

Knotweed should be disclosed when selling. The smoother path is to deal with it up front: get a survey, put a management plan and guarantee in place, and present the buyer with a documented, funded solution. A knotweed problem already being handled professionally is a far easier sale than one discovered mid-transaction.

The legal side, briefly

Under the Wildlife and Countryside Act it is not illegal to have knotweed, but you must not plant it or cause it to spread in the wild, and the plant and any soil containing it are classed as controlled waste. Both are further reasons professional handling is the safe route.

If knotweed is holding up your sale or remortgage in Arbroath or Angus, request a free survey and we will set out exactly what your lender is likely to need.