How to Choose a Builder in Kent: A Local's Guide

Hiring the right builder is the difference between a project you enjoy and one you’d rather forget. But choosing one in Kent comes with a few local wrinkles that generic advice misses: the ground moves more than most people realise, a surprising amount of the county is protected, and a huge share of its housing is exactly the kind of period property that punishes a one-size-fits-all approach. Here’s how to choose well.

Why choosing a builder in Kent is a bit different

Three things set Kent apart. First, its geology: much of the county sits on clay that swells and shrinks with the seasons. Second, its landscape protections: roughly a third of Kent is a designated National Landscape. And third, its building stock: Kent has more than 17,000 listed buildings and over 500 conservation areas, plus a distinctive vernacular of oasts, weatherboard and ragstone. A builder who knows all three is worth their weight in gold.

Kent ground can move: clay, chalk and foundations

The single most important technical point: the British Geological Survey rates Kent among the parts of Britain most susceptible to clay shrink-swell subsidence.

• Weald Clay underlies the Low Weald: think Tonbridge, Paddock Wood, Staplehurst and the Cranbrook area towards Ashford. It’s one of the country’s most damaging shrink-swell formations.
• London Clay covers north Kent (the Medway and Thames marshes, the Isle of Sheppey, Herne Bay and Whitstable) and is another classic subsidence soil.
• Chalk of the North Downs (Dartford through to Canterbury, Deal and Dover) is generally a good foundation, except where dissolution features or “swallow holes” cause differential settlement.

Why it matters: on shrinkable clay, especially near mature trees, foundations frequently have to go far deeper than a simple strip footing, sometimes 1.5 to 3 metres or more, with extra heave precautions. That’s a real cost difference, and it’s why a good Kent builder will recommend a site-specific soil or trial-hole investigation rather than quoting a fixed foundation price sight unseen. If a quote skips this entirely, be wary.

Planning is stricter across much of Kent

Kent is unusually constrained, so don’t assume your project falls under permitted development.

• The Kent Downs and High Weald National Landscapes (formerly AONBs) together cover around a third of the county. In these areas, permitted development rights are cut back: side extensions and outbuildings are restricted, and modest works can need full planning permission.
• In conservation areas, you’ll need permission to demolish, and there are tighter controls on alterations and even on trees.
• An Article 4 Direction can remove normal permitted-development rights street by street. Faversham has one of the largest in Kent, covering replacement windows, doors and roofs on principal elevations.
• Listed building consent is separate from planning permission and covers internal works too.

Planning is handled by Kent’s twelve district and borough councils (Tunbridge Wells, Maidstone, Canterbury, Ashford, Swale, Tonbridge & Malling, Sevenoaks and the rest), not by Kent County Council. Remember too that planning permission and Building Regulations approval are two different things; many projects need both. For Building Regs you can use either council building control or a registered private approver.

Period and vernacular properties need a specialist

Kent’s older housing is part of its charm and a genuine technical challenge. If your home is period or built in a local vernacular, hire accordingly:

• Oast houses and timber-framed Wealden hall houses were built to breathe. Modern cement render and hard mortars trap moisture and can cause serious structural decay, so these need lime-based, breathable methods.
• Kentish weatherboard needs regular recoating and character-matching repair.
• Kentish ragstone is a hard, unpredictable stone that breaks awkwardly and wants specialist masons and lime mortar.
• Flintwork is officially an endangered craft, with very few people working it full-time; it’s a specialist skill, not a general-builder job.
• Kent peg tiles usually fail at the fixings before the tiles themselves; a good roofer matches type, colour and size and beds them properly, which is why reclaimed tiles are in demand.

The common thread: on old buildings, the right builder reaches for lime, not cement. Ask directly about their experience with your property type.

Checks and accreditations that actually matter

Once you’ve got the local context, the universal checks still apply:

1. Public liability insurance. Expect at least £2m of cover; ask to see it.
2. Accreditation. The Federation of Master Builders (FMB) vets members and inspects their work; TrustMark is the Government-Endorsed Quality Scheme and is often required for grant-funded work.
3. Trade-specific registration. Any gas work must be done by a Gas Safe registered engineer (ask for the ID card), and notifiable electrical work needs a Part P competent-person scheme member.
4. A written contract. For an extension, the plain-English JCT Building Contract for a Home Owner/Occupier fixes price, schedule, variations and dispute resolution.
5. Party Wall notices. Kent’s towns are full of Victorian terraces and semis (Margate, Chatham, Tunbridge Wells). Work on a shared wall, a new boundary wall or nearby excavation triggers the Party Wall etc. Act 1996, with one to two months’ notice. Starting without it can land you with an injunction.

Building your shortlist

Don’t hire the first name you find. Aim for three written quotes so you can compare scope and approach, not just price, and lean towards builders who work regularly in your area and know the local ground, planners and suppliers.

Browse reviewed builders in Kent by town to start your shortlist (for example builders in Tonbridge or builders in Maidstone) and ask each one the questions above. A good builder will welcome them.