Grade II Listed Window Replacements
Sensitive, conservation-friendly window work across Devon, Cornwall, Dorset and Somerset.
Window replacements that pass conservation officer scrutiny
Listed building windows are a different job from standard replacements. Sightlines, glazing bars, opening patterns, materials and even paint colours all need to match the original — and the whole project needs Listed Building Consent before any work begins.
We've worked on Grade II listed properties across the South West, from Georgian townhouses in central Exeter to thatched cottages in the Dorset AONB. We supply slim-sightline timber sliding sash and flush casement windows, with documentation your conservation officer expects to see.
When spraying is a better fit than replacement
If your existing frames are timber and structurally sound, on-site spraying is often the most heritage-friendly route. Like-for-like repainting rarely needs Listed Building Consent, and we can match historic colours from National Trust, Farrow & Ball or any RAL.
Process
- Free on-site survey — we measure, photograph and discuss what your conservation officer is likely to accept.
- Written specification & drawings you can submit with your Listed Building Consent application.
- Once consent is granted, we manufacture bespoke timber units (typically 8–12 week lead time).
- Installation by our in-house team, respecting the surrounding fabric.
- Final inspection & 10-year guarantee on workmanship.
Frequently asked
Can you replace windows in a Grade II listed building?
Yes, but it requires Listed Building Consent from the local authority. We work with you and your conservation officer to specify slim-sightline timber or timber-effect units that match the original sightlines, glazing bars and opening pattern. We don't lodge the application for you, but we provide drawings, specs and sample profiles to support it.
What window styles are usually approved for listed buildings in Devon and the South West?
Most conservation officers approve like-for-like timber sliding sash or flush casement windows in painted softwood or hardwood. Slim double-glazed units (typically 14mm cavity with warm-edge spacers) are usually accepted. Standard chunky uPVC is almost never permitted.
Is uPVC ever allowed on Grade II listed windows?
Very rarely on the principal elevation. On rear or hidden elevations a slim-sightline timber-effect uPVC with bonded astragal bars can sometimes be approved — but always check with your conservation officer first.
Can we spray our existing listed-building windows instead?
If the frames are timber and structurally sound, on-site repainting and spraying is often the most heritage-friendly option and rarely needs consent for like-for-like colour. A colour change does usually need consent.
How long does Listed Building Consent take?
Typically 8–12 weeks for a straightforward window replacement application in Devon, Cornwall, Dorset or Somerset. We can usually book your installation around the application timeline.
What's the cost difference between standard and heritage-spec windows?
Heritage-spec slim timber sash windows usually cost 60–120% more than equivalent uPVC. We'll always give you both quotes side by side so you can weigh appearance against budget.
Not listed but in a conservation area?
Conservation areas have lighter restrictions than full listed status. See our window replacements page or book a free survey to talk through your options.
Ready to start your project?
Free quotes · 10-year guarantee · Friendly local service.