5 Best Window Installers in London for a Warmer, Quieter Home
The right windows make a big difference to your home’s comfort and security. Homeowners and landlords both need reliable pros for long-lasting results.
With so many companies competing for your attention, quality materials and clean installation matter most. But it’s hard to know who delivers on both.
That’s why I put together this list of the best options if you’re searching for a window installer in London.
I compared each company’s product range and overall value to help you match your renovation goals.
How much does window installation cost in London?
Window installation in London typically costs £400 to £1,800 per supplied and fitted window. Local prices sit roughly 10% to 20% above the national UK average because of higher labor rates.
| Window Feature | Estimated Cost (Supply & Fit) |
|---|---|
| uPVC Frames | £350 – £1,000 |
| Aluminium Frames | £550 – £1,200 |
| Timber Frames | £850 – £2,450 |
| Composite Frames | £900 – £1,900 |
| Standard Casement | £350 – £550+ |
| Tilt and Turn | 25% higher than standard casement |
| Sliding Sash | £600 – £1,500+ |
| Bay or Bow | £1,250 – £2,500+ |
1. Golden Ratio Sash Windows & Doors
Website: https://goldenratiowindows.co.uk/
Address: 218 Hornsey Rd, N7 7LL
Contact: +44 20 3488 1695, +44 7507 391329 | [email protected]
Hours: Monday-Friday, 8:00 AM – 6:00 PM | Saturday, 8:00 AM – 3:30 PM | Sunday, Closed
Golden Ratio Sash Windows & Doors handcrafts period-correct timber sash window replacements. They fit existing brick openings without any structural changes.
Their team uses durable Accoya timber backed by a 50-year anti-rot warranty. Slimline double-glazed units give period homes a seamless match to original glazing bars.
Installers are registered with the Fenestration Self-Assessment Scheme (FENSA). They handle everything from draught-proofing to emergency glass replacements across the capital.
They also offer restoration services, which help owners keep a property’s original character.
That craftsmanship does come at a price, though. Premium timber costs noticeably more than standard plastic. If you only want cheap plastic fixtures, their bespoke wooden designs won’t fit your budget.
Customer Reviews
The level of work is performed to the highest spec.
I recently used Golden Ratio to install a new sash window and some french doors for my daughters bedroom. The service was nothing short of exceptional. The level of work is performed to the highest spec.
James Hart | Google Review
Our new windows look amazing.
So happy with the whole experience with Golden ratio joinery. Our new windows look amazing. The whole process was very thorough, competitive in price and really quick for install – which was a nice surprise as the lead time was halved from what we’d thought it might be. The team were also exceptionally helpful when one of the old windows were were planning to replace was severely damaged during a storm.
eri dikaj | Google Review
2. Doorwins
Website: https://doorwins.com/upvc-double-glazing-windows-and-doors-london/
Address: Office 3, 186 Greenford Ave, Hanwell, W7 3QT
Contact: +44 20 8629 1250, +44 20 8629 1171
Hours: Monday-Sunday, 7:00 AM – 10:00 PM
Doorwins is a useful option if you’re looking for glazing services across Greater London. They offer both supply-only and supply-and-install services. Their speciality is secure unplasticised polyvinyl chloride (uPVC) windows.
I like the range of frame styles available, including aluminium and uPVC. The multi-chamber profiles help with thermal insulation, while reliable locking systems add extra security. These features can help keep your home both warm and secure.
They also provide a 10-year warranty on glazing products, which gives you some added reassurance.
Another advantage is their coverage across inner and outer Greater London. Most homeowners should be within reach.
However, residential work can face scheduling delays during busy commercial periods. The lack of timber options may also be disappointing if you prefer a more traditional frame material.
Customer Reviews
i will continue buying from or through this company in future
I am a Home developer my self, so needed a good direct manufacturing company for ongoing projects, glad to have found doorwins for both aluminium and upvc frames on supply only and supply and install services. They’ve delivered over 100 windows, doors, flat roof glass for us and completed 4 projects and i will continue buying from or through this company in future, very happy with outcome so far
Michael Backer | Google Review
group have overdelivered on quality, service and aftercare.
We managed to get a mix of upvc and aluminium frames , aluminium bifolds and triangle window for the extension area and the rest of house pvc, the balcony twin frame looks amazing and doorwins group have overdelivered on quality, service and aftercare.
Eddy P Rice | Google Review
3. The Best Windows Installer Limited
Website: https://thebestwindowsinstallerlimited.co.uk/
Address: 16 Woodstock Rd, E7 8ND
Contact: +44 7477 846804
Hours: Monday-Friday, 9:00 AM – 5:00 PM | Saturday-Sunday, Closed
The Best Windows Installer Limited makes the process feel straightforward from the first quote through to the final fix. I like that they keep customers updated along the way, so you shouldn’t have to chase them for progress reports
Free quotes are another useful feature. They make it easier to compare your options before committing.
Their experienced team handles everything from standard uPVC installations to sturdy aluminium frames. I think the aluminium work is particularly useful if you want a durable frame without much fuss.
They also carry out routine repairs, which can help keep your existing frames in good condition.
The main thing to consider is their opening schedule. They’re closed on weekends, which could make consultations harder for busy professionals.
Their focus on modern materials may also leave you looking elsewhere if you want bespoke wooden designs or heritage restoration.
Customer Reviews
I’d give six stars if I could!
Outstanding – Zabi and his team the best in the business. True professionals – the quality of their is top-level. I couldn’t be happier with the way my new windows look. The materials are high spec, their installation is flawless and the silicone finishing is absolutely perfect. Beyond that, Zabi is extremely polite, very responsive and easy to deal with. He and his team arrived punctually, worked non-stop and were extremely tidy. The rates are fantastic and the work is incredible. I’d give six stars if I could!
John Hartley | Google Review
Thank you once again for your outstanding effort!
I wanted to take a moment to express my heartfelt thanks for your hard work and professionalism. Your dedication to your work has truly made a difference, and I genuinely appreciate everything you have done.
I will be sure to recommend your services to others, as I am confident they will benefit just as I have. Thank you once again for your outstanding effort!
SAMIM ARIF | Google Review
4. London Box Sash Windows Ltd
Website: https://www.londonboxsash.com/
Address: 9 Tramsheds, Coomber Way, CR0 4TQ
Contact: +44 20 8648 4230 | [email protected]
Hours: Monday-Friday, 7:30 AM – 4:30 PM (Showroom by Appointment Only) | Saturday-Sunday, Closed
London Box Sash Windows Ltd is a trusted family-run workshop with over 40 years of experience designing and installing bespoke wooden sash windows.
Because most installations happen within a 10-mile radius of their workshop, local service stays prompt and reliable.
As dedicated specialists, they craft every window to order using premium Accoya timber alongside A-rated double glazing.
Sustainable options like Abodo or Sapele wood provide a unique finish backed by low-maintenance paint systems that keep the wood looking fresh for decades.
Their heritage designs look outstanding on period homes.
Showroom visits are by appointment only, though, so spontaneous browsing isn’t possible. They also don’t offer basic uPVC. If that’s what you’re after, you can check other window replacement options.
Customer Reviews
London Box Sash were truly amazing
London Box Sash were truly amazing – from the initial discussions and measuring appointments to the seamless install – we couldn’t fault them. We’re so pleased with the results and get so many compliments and people asking who did the windows (!) Thank you!
Martha Hanks | Google Review
Thanks for a great job!!
We had 3 sash windows and a new bay fitted. The windows are great and London Box Sash were brilliant from start to finish. We were a bit worried about damage that might be caused by the install but you would never know they’d been. Andy (the installer) was brilliant and is a real craftsman. Thanks for a great job!!
Stephen Luxford | Google Review
5. Aura Windows Ltd
Website: https://aura-windows.co.uk/
Address: 66 Paul St, EC2A 4NA
Contact: +44 20 3888 3888
Hours: Monday-Friday, 9:00 AM – 5:00 PM | Saturday-Sunday, Closed
Aura Windows Ltd built their reputation on energy-efficient uPVC windows. Their local installers secure properties using top-grade locking mechanisms.
They also supply modern double-glazed casement and sliding sash styles designed to cut heat loss and reduce outside noise for a much quieter home.
Both their aluminium and uPVC selections hold up exceptionally well over time, delivering great long-term value for modern properties.
Plus, if you’re coordinating a bigger renovation with handyman services, their team can seamlessly handle the glazing side of things.
The main catch is that installation pricing isn’t fixed, so you’ll need to request a quote to get the final cost. Payment options can also vary by project scope.
Customer Reviews
Very pleased
The new windows look fantastic and have really improved the overall appearance of the property. Very pleased with the result.
Hasan Nuur Macalin | Google Review
Friendly and effecient
Excellent experience overall. The team were friendly, efficient, and the quality of the work was impressive.
Kondal Kondal | Google Review