Written by Mark Reid,
Trades Editor ·Verified 23 September 2026
Bath's housing stock throws up a few challenges you won't find everywhere. Large swathes of the city sit within a conservation area, and plenty of properties are listed buildings around Bathwick, Widcombe and the city centre, which means timber sash windows often have to be repaired or replicated rather than swapped for uPVC. Head out to newer estates in Odd Down or Weston and it's a different job entirely, with straightforward casement or tilt-and-turn replacements being the norm. A good installer in this area needs to know when planning permission or conservation area consent applies, not just how to fit a window.
The businesses featured here are pulled from public business listings and ranked using review rating and review count, with a modest boost for those showing a working website and phone number. We check each installer's homepage to confirm window installation is genuinely what they do day-to-day, which stops general builders or double glazing showrooms with no fitting service from cluttering up the page. Listings flagged as permanently closed are stripped out automatically. Where you spot a Trust Verified badge, that business has gone through our fuller verification, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information. You can read exactly what that involves on our How We Verify page. For any business without the badge, those checks haven't been done by us, so it's worth doing them yourself before you commit.
Before booking, ask to see FENSA or CERTASS registration, since either scheme confirms the installer can self-certify building regulations compliance without a separate council inspection. Get the U-value and glazing spec in writing, particularly if you're near the A4 or a busier road and noise reduction matters. If your property is listed or in a conservation area, ask how they'll handle the paperwork, because getting this wrong can hold up a project for weeks. Always get two or three quotes; prices for the same job can vary by several hundred pounds depending on how busy the firm is and what frame material you're after.
How We Select & Rate The Best Window Installers in Bath
Ranking is based on review rating and review count from public business listings, with a small lift given to businesses that show a working website and phone number. We check each business's homepage to confirm window installation is what they primarily offer, and listings flagged as permanently closed are removed automatically. Businesses marked Trust Verified have gone further, passing our full verification covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information; see our How We Verify page for the full detail. Other businesses on this page haven't been independently verified by us, and being included isn't an endorsement. Do your own checks before hiring.
Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →
LF Replacement Windows and Conservatories carries out window and conservatory installation work for homeowners in Bath. The business is based on the edge of the city, serving both urban and surrounding rural properties.
Sash Windows of Bath works mainly on Georgian and Victorian properties around Bath, where original timber frames need repair or careful replacement rather than a standard fit. The focus stays on period-appropriate joinery, matching profiles and glazing to suit older buildings.
Revival Timber Sash Windows ltd is a Bath window specialist concentrating on timber sash windows, a common requirement in the city's period properties. The firm handles repair and installation work and serves clients across Bath and its surrounding neighbourhoods.
Cure Double Glazing Repairs Ltd handles window installation and glazing repair work across Bath. The company focuses specifically on double glazing, covering the replacement and restoration of sealed units, frames, and associated hardware.
Bath Sash Windows specialises in the repair and installation of timber sash windows, a common requirement in the city's period properties. The firm's focus on this single window type reflects the demands of Bath's conservation areas, where matching original proportions and materials matters.
Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →
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For a standard uPVC casement window supplied and fitted, expect somewhere between £400 and £700 per window, depending on size and glazing spec. Timber sash windows cost more, often £900 to £1,500 each once you factor in horns, sash cords and matching period detailing, which is common in areas like Bathwick or the Royal Crescent conservation zone. A full house of eight to ten windows can range anywhere from £4,000 to £15,000. Get two or three quotes, because prices vary a fair bit between installers depending on frame material and how busy they are.
Do I need planning permission to replace windows in Bath?
Most straightforward like-for-like replacements fall under permitted development, so you won't need planning permission. But large parts of Bath sit within a conservation area, and if your property is listed, you'll almost certainly need consent before changing window style, material or even colour. A decent installer will flag this at the quote stage, but it's worth checking with Bath and North East Somerset Council yourself if you're unsure, since getting it wrong can mean costly remedial work later.
How long does a window installation take?
A single window replacement usually takes half a day to a full day. A whole house re-glaze, say eight to twelve windows, typically takes two to four days depending on access and whether any brickwork or lintels need attention. Bay windows and sash windows take longer per unit because of the extra joinery involved. Ask for a timeframe in writing before work starts, and check what happens if bad weather delays fitting, particularly for open sash frames.
What's the difference between FENSA and CERTASS?
Both are competent person schemes that let installers self-certify their work meets building regulations, saving you a separate council inspection fee. FENSA is the older, more widely recognised scheme, while CERTASS covers similar ground. Either is fine, what matters is that your installer is registered with one of them and gives you a certificate after the job, which you'll need if you ever sell the property.
Should I choose uPVC, timber or aluminium windows?
It depends on your property and budget. uPVC is the cheapest and lowest maintenance, suiting most modern homes around Odd Down or Combe Down. Timber suits period properties and is often required in conservation areas or on listed buildings, though it needs repainting every few years. Aluminium sits in between on price, with slim sightlines that work well on extensions or contemporary renovations. If you're in a conservation area, check with your installer what's actually allowed before you fall in love with a particular option.
How do I choose between window installers in Bath?
Start by asking to see their FENSA or CERTASS registration number and check it independently on the scheme's website rather than just taking their word for it. Ask for proof of public liability insurance and how long they've been trading locally. Read through recent customer reviews, not just the star rating but what people actually say about tidiness, timekeeping and how issues were resolved. Get a written quote that breaks down frame material, glazing spec and any building work involved, and always get at least two comparisons before signing anything.
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