Timber Sash & Casement Window Specialists in Dorset

Barnsbury Joinery repairs, replicates and sensitively upgrades traditional timber windows across Dorset — from Georgian terraces to village cottages in conservation areas. We balance heritage detail with modern comfort, and we help with permissions and paperwork.

What we do (heritage-friendly services):

Repair & overhaul – spliced timber repairs, sill replacements, cord & pulley renewal, draught-proofing, reglazing.
Like-for-like replacement – bespoke softwood/hardwood sashes & casements, correct profiles & putty lines; slimline double glazing where acceptable.
Secondary glazing – discreet internal systems for listed homes where DG isn’t permitted.
Doors & fanlights – period-correct front doors, frames and fanlights to match streetscapes.
Planning support – photos, measured drawings, section details and heritage statements for LBC/planning.

Quick win: We repair first wherever feasible — saving original fabric, carbon and cost.

Areas we serve in Dorset

Blandford Forum • Sherborne • Dorchester • Bridport • Lyme Regis • Beaminster • Wimborne Minster • Wareham • Swanage • Shaftesbury • Corfe Castle • Abbotsbury • Milton Abbas — and surrounding villages.

Why Dorset homeowners choose Barnsbury Joinery

Conservation-grade detail – correct glazing bars, horns, meeting rails and putty-fronted sightlines.
Approvals made easier – we prepare the drawings/specs councils expect, and advise what typically gets accepted.
Performance without compromise – draught-proofed, smooth-running sashes that keep character and improve comfort.
Transparent proposals – repair vs replace options with clear costs and timelines.
Aftercare – maintenance plans and guarantees.

Our process:

Free survey & report – condition, moisture/decay checks, photos.
Heritage-led spec – repair vs replace recommendation, matching profiles agreed.
Permissions – we advise on whether Listed Building Consent/planning is needed and prep supporting documents.
Manufacture – hand-built sashes/casements with accurate sections; factory finishing available.
Clean installation – careful removal, minimal disruption, decorator’s fill and finishing as agreed.
Sign-off & care guide – snag list resolved and maintenance plan provided.

Planning & conservation guidance:

Conservation area: like-for-like replacements or visible changes often need permission.
Listed buildings: expect repair first. If replacement is justified, profiles and materials must match; secondary glazing is often the best efficiency upgrade.
Slimline double glazing: sometimes acceptable for non-listed homes if external appearance is unchanged.
We help by supplying drawings, sections and heritage notes councils can evaluate quickly.

Our Dorset Projects:

Blandford Forum – Market Place terrace: overhaul & draught-proofing of 6 sash windows and restored putty lines.
Sherborne – Newland villa: replica slimline double glazed sashes with matching horns; approved profile samples.
Lyme Regis – seafront cottage: timber casement repair + secondary glazing to reduce noise and drafts.

FAQs:

Do I need permission to change my windows in a conservation area?
Often yes. We’ll check your address, advise what’s needed and prepare the drawings and notes.

Can I get double glazing if my home is listed?
Usually no for external windows; secondary glazing inside is the normal route. We’ll spec an unobtrusive system.

Will new timber windows look different from my originals?
No. We match sections, bar widths, horns and sightlines so the street view remains authentic.

What timber and finishes do you use?
Accoya®, engineered redwood or hardwoods on request; factory spray or site finishing to match existing.

How long does an overhaul take?
A typical 4-sash terrace can be overhauled in 1–2 days once on site; full replacements vary by scope.

Book a heritage window survey

Get practical advice, a repair-first plan and clear costs.
Call: 020 7164 6305 • Email: info@barnsburyjoinery.com • Request a survey