County Londonderry · Northern Ireland

Sash Windows in County Londonderry

Homeowners and landlords in County Londonderry can get a written sash window quote that fixes the price for the joinery, glass, colour and hardware shown.

Guide from £1,495
5 towns covered
Postcode areas BT

County Londonderry: timber sash windows

A traditional box sash hides cast-iron or lead weights inside the side boxes of the frame, connected to each sash by cords running over pulleys. Modern sash windows often use spiral or spring balances instead, which take up less depth and suit uPVC and some new timber designs without weight pockets.

Sash windows that run smoothly need routine care: keep the pulley wheels free of paint, wax or lightly lubricate the running channels, check the cords for fraying, and repaint timber before bare wood shows. Draught brush seals in the beads and meeting rails reduce rattles and heat loss.

Sash windows can be supplied as complete new frames, or as new double glazed sashes fitted into an existing sound box frame. Keeping the box retains original linings and architraves and reduces disturbance to plaster, but only works when the frame is free of rot and still square.

Sash window prices depend on size, timber or uPVC, whether you replace the whole frame or just the sashes, the glazing bar pattern, horns and mouldings, glass type and the paint colour. Listed or conservation work that needs matching details costs more. See the guide prices for typical ranges.

Georgian terrace with white sliding sash windows

Towns we cover for sash windows in County Londonderry

Choose your town for local details, nearby areas and the postcode districts we cover.

What applies in County Londonderry

Technical Booklet V covers safety glazing in Northern Ireland, including glass in and around doors and low-level glazing where people could walk into it.

Listed buildings in Northern Ireland need listed building consent for most changes to historic windows.

County Londonderry has its own coastline, so for homes and businesses near the sea, salt air and wind-driven rain are part of the brief. Salt-laden wind and driving rain shorten the life of paint on exposed sashes, so coastal timber windows benefit from durable timbers, good factory coatings and regular inspection. Brass or stainless sash furniture resists corrosion better than plated steel near the sea.

Older rural houses often have sash openings that are out of square, with soft stone or lime plaster around them, so each window is measured individually and fitted gently. Exposed sites benefit from draught seals and robust weatherboards on the bottom sash.

Guide prices

Guide prices inc VAT for typical jobs. Remote and island locations are quoted by arrangement. Your written quote fixes the price after measuring.
Typical job	Guide price inc VAT
uPVC sliding sash, 900 × 1500 mm	£1,495 – £1,995
Timber-effect uPVC sash, 900 × 1500 mm	£1,795 – £2,295
Painted timber sash, 900 × 1500 mm	£2,595 – £3,295

Choosing your sash windows

uPVC sliding sash

Low-maintenance uPVC frames with sculpted profiles and optional woodgrain foils, suited to homes where planning rules allow uPVC.

Timber box sash

Traditional weights, cords and pulleys in a box frame, made in engineered softwood or hardwood and factory painted to your colour.

Heritage glass options

Slim double glazing, low-E coatings and textured glass that looks like old cylinder glass for sensitive elevations.

Tilt-in sashes

Sashes that tilt inwards for cleaning upper-floor glass from inside, and can help provide an escape opening.

Sash Windows in County Londonderry: questions

How secure are sash windows?

New sash windows can be secure when fitted with keyed locks at the meeting rails, sash stops, laminated glass and tight-fitting beads. Older sashes often rely on a single catch, which is easily forced. Upgrading ground-floor and easily reached windows first makes sense, and the glazier can recommend locks that suit the sash and frame.

What guarantee comes with new sash windows?

Manufacturer guarantees apply to the joinery, finish, sealed units and hardware, and the terms are confirmed in writing. Cover on the paint finish often depends on regular maintenance, so check the conditions. Guarantee terms for the installation are set out in writing with your quote, so you know what is covered before agreeing to go ahead.

Can I have double glazed sash windows in a listed building?

Sometimes, but listed building consent is needed for significant works, and some councils will only accept repair of the original windows or slim double glazing with matching details. Secondary glazing is often accepted where new windows are not. Speak to your council's conservation officer before ordering; we can provide drawings and specifications to support an application.

How long does it take to replace sash windows?

Fitting a single sash window usually takes most of a day, longer where the box frame is removed or plaster disturbed. A whole house typically takes several days on site. The windows are made to order first, and timber sashes with special details take longer to manufacture; the lead time is confirmed in writing with your quote.

Which parts of County Londonderry do you cover for sash windows?

We cover the whole of County Londonderry, including Derry/Londonderry, Coleraine, Limavady, Magherafelt and Portstewart, and postcode areas BT. Building rules for sash windows here follow the regulations for Northern Ireland. Enter your postcode on the quote form and we will confirm cover; then a glazier will arrange a free survey before giving you a written quote.

Other glazing services in County Londonderry

All glazing in County Londonderry · Sash Windows across the UK

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