Barn Conversions in Kent
Barn Conversions Across Kent
Tonbridge-based builders converting barns, oast houses and timber-framed Kentish buildings into homes. Class Q and heritage specialists, structural repair to full fit-out. 5★ Google rated, 20+ years experience.
Typical Conversion Cost
£2,000–£3,000 / sqm
Structurally sound barn
Typical Programme
9–15 months
On site, condition-dependent
Scope
Structural repair, foundations, weathertight shell and full fit-out — groundworks, brickwork and carpentry self-delivered
Free, no-obligation quote
Converting Kent's Barns into Homes for Over 20 Years
Kent has one of the richest stocks of historic agricultural buildings in England — timber-framed threshing barns, oast houses, Kentish ragstone barns and brick cart sheds, many of them in the rolling farmland of the High Weald. Converting one into a home is one of the most rewarding projects a builder can take on, and one of the least forgiving. The structure is rarely square, the foundations were often minimal, and the fabric has to be respected rather than ripped out. It is exactly the kind of work that suits a builder who self-delivers groundworks, brickwork and carpentry rather than subcontracting the trades that matter.
Carey Brothers & Sons has worked across Kent for more than two decades. Lewis Carey runs the groundworks and machinery — the foundations, underpinning and drainage that almost every barn conversion needs — and Alex Carey leads the brickwork and carpentry, including the heritage detailing a timber-framed or listed barn demands. Our recent Sevenoaks stable redevelopment in the Weald is a good example of the breed: an agricultural structure brought up to residential standard without losing the character that made it worth converting in the first place.
The honest part of the conversation comes first. Not every barn is a candidate, and not every site can use the Class Q permitted-development route — large parts of West Kent sit inside the High Weald and Kent Downs National Landscapes, where Class Q does not apply and full planning permission is required. We tell you which route fits your site, and what the structure will realistically cost to convert, before you commit a penny to drawings. That clarity at the start is what keeps a barn conversion from becoming the cautionary tale everyone has heard about.
Get a Free Quote
Tell us about your barn — where it is, what it's made of, and what you'd like it to become. We'll call you back with an honest read on feasibility, route and cost.
What it Costs
Barn Conversion Costs in Kent — 2026 Guide
The condition of the existing structure drives barn-conversion cost more than anything else, so the table below is banded by how much structural work the building needs. Figures are for the conversion itself, excluding professional fees, VAT considerations and any land purchase.
| Type of conversion | Cost per sqm | What it covers |
|---|---|---|
| Sound-structure conversion | £1,500–£2,000 | Barn already weathertight, simple layout, standard specification |
| Full conversion | £2,000–£3,000 | New foundations, structural repair, insulation, services, quality fit-out |
| Listed / heritage | £3,000–£4,500+ | Listed consent, timber-frame repair, lime mortars, conservation detailing |
Costs above are indicative for barn conversions delivered in Kent in 2026 and exclude professional fees, planning and listed-building consent costs, and VAT. A qualifying conversion may attract a reduced (5%) VAT rate on the building work — we will explain whether yours qualifies at quote stage.
Local Knowledge
Class Q and Planning for Kent Barn Conversions
The first question on any barn conversion is which planning route applies. Get this right and the project is straightforward; get it wrong and you waste months and thousands on the wrong application. Here is the honest position for Kent.
The Class Q permitted-development route
Class Q lets you convert an agricultural building to homes through a prior-approval process rather than full planning. The 2024 rule changes allow up to ten dwellings and 150 sqm per home. The barn must have been in agricultural use on or before 20 March 2013, and prior approval still covers transport, flooding, noise, contamination and design. It is faster and more certain than full planning — where it is available.
Where Class Q does not apply in Kent
This is the part that catches Kent owners out. Class Q is excluded in National Landscapes (formerly AONBs), conservation areas, and for listed buildings — and the High Weald and Kent Downs National Landscapes cover a very large share of West Kent. If your barn is in one of these, or is listed, Class Q is off the table and you need full planning permission and, for listed barns, listed-building consent.
Listed and timber-framed barns
Kent's threshing barns and oast houses are frequently listed. A listed conversion has to repair rather than replace original timbers, use lime mortars and breathable build-ups, and avoid interventions that harm the frame. It costs more and takes longer, but it is also where the character — and much of the value — lives. We work to heritage standards with conservation officers and historic-frame structural engineers.
Foundations, structure and Building Regs
Agricultural barns were rarely built to carry a home. Most conversions need new or underpinned foundations, insulated floors, and a structure brought up to Building Regulations. Kent's clay and Greensand subsoils move seasonally, so ground investigation and the right foundation design matter. Lewis Carey runs groundworks in-house, so this is handled by the same team that delivers the rest of the build.
Planning Permission in Kent — Full Guide
Our 2026 guide covers thresholds, fees, pre-application advice and timelines for every Kent authority, including how National Landscape status changes what you can do.
How We Work
From First Site Visit to Finished Home
Most Kent barn conversions break down into four phases. We tell you exactly what is happening, when, and why — starting with the honest feasibility read that protects your budget.
Feasibility & structural survey
We meet you at the barn and give an honest assessment: is the structure sound enough to convert, and does Class Q apply or will you need full planning? Where useful we commission a structural survey of the frame and roof, and introduce you to planning consultants or heritage architects who know your local authority. This is the stage that saves the most money — a clear-eyed read on the building before anyone draws anything.
Planning / Class Q prior approval
If Class Q applies, we support the prior-approval application (use, transport, flooding, noise, design). If the barn is listed or sits in a National Landscape, your architect prepares a full planning and listed-building consent application; we contribute buildability advice and indicative costs. Pre-commencement conditions are discharged before we start, and we provide a detailed, fully-priced quote against the approved drawings.
Structural works & weathertight shell
On site we stabilise and repair the structure — frame repairs, new or underpinned foundations, drainage, roof repair or replacement, and forming the openings for windows and doors. Carey Brothers self-deliver groundworks, brickwork and carpentry, which is the single biggest reason historic conversions stay on programme. Getting the barn weathertight and structurally sound is the foundation everything else sits on.
Fit-out & handover
Insulation and breathable build-ups appropriate to a historic structure; first-fix electrics, plumbing and heating; plaster, second-fix carpentry, kitchen, bathrooms, decoration, flooring and external works. We commission services, snag the build with you, and hand over a defects schedule covered by a 24-month workmanship guarantee.
Why Carey Brothers
Why Kent Barn Owners Choose Us
We self-deliver the critical trades
Groundworks, brickwork and heritage carpentry — the trades a barn conversion lives or dies by — are run by Lewis and Alex personally. No waiting on a subcontractor between structural and fit-out stages.
Fully insured, 20+ years trading
Public liability, employer's liability and contractors all-risk cover in place. We have built continuously across Kent since 2004 — references and recent project visits available on request.
Honest about route and condition
We tell you whether Class Q or full planning applies, and whether the structure is worth converting, before you spend on drawings. Saving you from the wrong application is worth more than any sales pitch.
Heritage-grade where it matters
Lime mortars, breathable build-ups, timber-frame repair and conservation detailing for listed and timber-framed Kentish barns — done properly, with conservation officers and historic-frame engineers.
Where We Work
Barn Conversions Across Kent
Tonbridge-based, covering Kent and into Bromley borough — including the High Weald National Landscape where so many of the county's historic barns stand. Click your area for local notes and recent projects.
Recent Work
Kent Conversion & Heritage Projects
From a stable redevelopment in the Weald to new builds and renovations across the county, our recent project gallery shows the breadth of conversion and heritage work we deliver in Kent.
Helpful Guides
Barn Conversion Reading
Detailed guides covering planning, renovation cost, foundations and brickwork.
Do I Need Planning Permission? Kent Homeowner's Guide 2026
A clear, practical guide to planning permission and permitted development in Kent — covering extensions, outbuildings, loft conversions, and local council specifics.
Read moreHouse Renovation Costs in Kent: Room-by-Room Breakdown
A practical guide to renovation costs in Kent for 2026 — covering kitchens, bathrooms, bedrooms, and whole-house projects with realistic budgets and expert advice.
Read moreUnderstanding Groundwork: The Foundation of Every Great Build
Learn why proper groundwork is essential for any construction project and what goes into laying solid foundations in Kent's challenging ground conditions.
Read moreSpecialist Brickwork: Traditional vs Modern Techniques
Explore the craft of specialist brickwork — from traditional lime mortar and decorative bonds to modern methods and brick matching for extensions in Kent.
Read moreCommon Questions
Barn Conversions Kent — FAQ
1How much does a barn conversion cost in Kent?
Most Kent barn conversions cost £2,000–£3,000 per square metre for a full conversion of a structurally sound building, so a 200 sqm barn typically runs £400,000–£600,000. A straightforward conversion of a barn that is already weathertight, with a simple specification, can start nearer £1,500–£2,000 per square metre. Listed barns, heavily decayed timber frames and conversions in the High Weald or Kent Downs National Landscapes (where conservation-led detailing is required) push costs to £3,000–£4,500+ per square metre. The condition of the existing structure is the single biggest variable, which is why we always start with a structural survey rather than a guess.
2Can I convert a barn under Class Q permitted development in Kent?
Sometimes — but much of rural Kent is excluded. Class Q permits the change of use of an agricultural building to homes through a prior-approval process rather than full planning, and the 2024 rule changes allow up to ten dwellings and 150 sqm per home. However, Class Q does NOT apply in National Landscapes (formerly AONBs), conservation areas, or to listed buildings — and the High Weald and Kent Downs National Landscapes cover a very large share of West Kent. The barn must also have been in agricultural use on or before 20 March 2013. If your barn sits inside a National Landscape or is listed, you will need full planning permission instead. We will tell you honestly which route applies to your site at the first visit, before you spend money on drawings.
3How long does a barn conversion take in Kent?
Allow nine to fifteen months on site for a full conversion, depending on the condition of the structure and the specification. A sound, weathertight barn with a simple internal layout can complete in around eight months; a decayed timber frame needing extensive repair, new foundations and conservation-grade detailing runs to fifteen to eighteen months. Before site work begins, the Class Q prior-approval process takes around eight to twelve weeks, while a full planning application in a National Landscape typically takes three to six months including pre-application advice and design development.
4Do you convert listed barns and timber-framed Kentish barns?
Yes. Kent has a particularly rich stock of timber-framed threshing barns, oast houses and Kentish ragstone barns, and many are listed. Listed barn conversions need listed building consent alongside planning permission, and the works have to respect the historic fabric — repairing rather than replacing original timbers, using lime mortars and breathable build-ups, and avoiding interventions that damage the frame. Alex Carey leads our brickwork and carpentry, and we work to heritage standards with conservation officers and structural engineers experienced in historic timber frames. We are honest about where a listed conversion costs more than a modern build, and why.
5Does a barn need new foundations to be converted?
Usually, at least in part. Many agricultural barns were built on minimal footings or none at all, so converting one into a dwelling generally means underpinning the existing structure or forming new foundations to carry the loads a home imposes — insulated floors, internal walls, services and Building Regulations standards. Kent's ground conditions vary mile by mile (Wealden clay around Tonbridge, Greensand across Sevenoaks, chalk to the north), and clay in particular moves seasonally. Lewis Carey runs our groundworks in-house, so foundation design and ground investigation are handled by the same team that delivers the rest of the build — no waiting on a separate groundworks subcontractor.
6Which Kent areas do you carry out barn conversions in?
We convert barns across West Kent and the surrounding areas — Tonbridge (our home town), Sevenoaks, Tunbridge Wells, Maidstone, Ashford, Hildenborough, West Malling, Borough Green, the Weald and into Bromley borough at Chislehurst. Our base at 24 Dodd Road in Tonbridge sits at the centre of West Kent, so we reach most rural sites within an hour. Barn conversions are concentrated in exactly the rural and edge-of-settlement locations we know best, including the High Weald National Landscape where so many of Kent's historic barns stand.
7How do I get started on a barn conversion in Kent?
Start with a free, no-obligation site visit. Call 07879 447975 or use our contact form. We will look at the barn, give you an honest read on its structural condition, tell you whether Class Q or full planning is the realistic route for your site, and talk through likely cost and programme. From there we can recommend next steps — a structural survey, an introduction to a planning consultant or heritage architect, or a costed outline if you already have drawings. There is no fee and no pressure for an initial conversation.
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