Timber cladding on a house: what buyers need to know

Timber clad houses are common across England and Wales, from rural self-builds to suburban extensions. When well maintained, timber cladding is durable and attractive. When neglected, it can harbour moisture, rot and insect damage that a survey will flag and a buyer will need to factor into their decision.

Timber cladding is a layer of wooden boards fixed to the exterior of a building. It serves two purposes: protecting the underlying structure from the elements and providing an aesthetic finish. Common types include featheredge, shiplap, tongue and groove and loglap, each fixed slightly differently but all requiring similar ongoing maintenance.

In Britain, oak, larch, Douglas fir, red cedar and sweet chestnut are the most widely used species. The type of timber affects how long the cladding lasts, how it weathers and what maintenance it needs.

With proper maintenance, timber cladding can last 20 to 40 years or more. The lifespan depends on the species used, how well it was installed, the exposure of the property to weather and how consistently it has been maintained.

Cladding that has been left without treatment for several years can deteriorate significantly faster than this. A surveyor will assess the current condition and give an indication of how much serviceable life remains.

Rot and decay are the most serious issues. Moisture that enters through cracked or failing boards, poor joints, damaged fixings or overflowing gutters can penetrate behind the cladding and cause rot to spread into the underlying structure. This can be expensive to remedy, particularly if the wall behind has been affected.

Warping and splitting occur as wood expands and contracts with changes in temperature and humidity. Warped boards allow water to get behind the cladding more easily, accelerating deterioration.

Insect damage from woodworm or other pests can weaken boards from within. On older properties this is worth checking carefully, particularly where the cladding has not been treated regularly.

Staining and discolouration can indicate damp ingress or the early stages of mould growth, or simply a lack of maintenance. A surveyor will assess which is the case.

Failed fixings where nails or screws have rusted or worked loose can cause boards to pull away from the wall, compromising weatherproofing.

Timber cladding that was added to a property after it was built may have required planning permission, particularly in conservation areas, national parks or on listed buildings. If the cladding was installed without the necessary consents, that is a legal issue your conveyancing solicitor will need to investigate.

A surveyor will note any cladding that appears to have been added as an alteration and flag it for further enquiry if there are any concerns.

As part of a RICS Level 2 HomeBuyer Report or RICS Level 3 building survey, the surveyor will inspect all accessible cladding for signs of rot, warping, failed fixings, insect damage and any evidence of damp penetrating behind the boards.

A Level 3 survey will go further, assessing the condition of the substrate behind the cladding where this is accessible and giving more detailed advice on remedial work and likely costs. On a timber clad property, a Level 3 survey is often worth considering. Our house survey cost guide explains what each level covers and what to expect to pay.

Where problems are found, the survey report gives buyers a basis to renegotiate the agreed price or ask the seller to carry out repairs before exchange.

A property survey will assess the condition of timber cladding thoroughly and give you a clear picture of any issues before you commit to a purchase.

At Surveyor Local, we work exclusively with RICS-accredited chartered surveyors across England and Wales. Our friendly team can arrange a survey quickly and at a competitive price.

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