Double Glazing Quotes Online — 3 Free, No-Obligation Quotes
Free double glazing quotes online in the UK typically show uPVC windows cost £350–£650 each fitted, or £4,000–£6,000 for a 3-bed home — with aluminium and timber costing more. Tell us about your windows once and we’ll match you with up to 3 vetted, insured, FENSA/CERTASS-registered installers near you — compare quotes side by side and pick the best value. 100% free, no obligation, and most quotes come back within 24 hours.
Free double glazing quotes online typically reveal that uPVC windows cost £350–£650 each fitted, or roughly £4,000–£6,000 for a whole 3-bed home; aluminium and timber cost more. Submit your job once and up to 3 vetted, FENSA/CERTASS-registered installers respond with no-obligation quotes, usually within 24 hours.
How do I get double glazing quotes online?
Getting double glazing quotes online the old way meant ringing round showrooms, sitting through a home visit and waiting days for a call-back. BestBuilders does it once, in three steps — no phone tag, no showroom, no pressure:
- Tell us about your windows. Use the 60-second form above — how many windows, the material and style you want (uPVC, aluminium or timber; casement, sash, tilt-and-turn or bay), and your postcode. No account needed.
- We match you with up to 3 local installers. Vetted, insured, double glazing specialists who cover your area receive your job and respond with their quotes, most within 24 hours.
- Compare and choose — or don’t. Weigh the quotes side by side on price, glass spec, energy rating, guarantee and reviews. The service is 100% free and there is no obligation to accept any quote.
You deal directly with the installers — there is no middleman mark-up on the work, and nothing to pay us at any point. Prefer to price the job yourself first? Use the double glazing cost calculator for an instant ballpark before you request quotes.
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How much do double glazed windows cost in the UK in 2026?
Double glazing is priced per window, supplied and fitted, then totalled for the whole job. In 2026, a standard uPVC casement window costs £350–£650 fitted, with prices largely stable after the 2023–24 spikes — most installers have held or made only modest 2–4% increases as material supply chains settled. The single biggest drivers of your quote are the frame material, the window style and size, the glass specification (energy rating), and where you live.
The figures throughout this page are typical UK supplied-and-fitted prices including VAT, removal of the old window and standard scaffolding for a normal ground-and-first-floor home. They are ranges, not fixed prices — that is exactly why comparing three written quotes matters. For a deeper breakdown by size, glass and region, see our full double glazing cost guide.
What does double glazing cost per window by material?
Frame material sets both your price and the upkeep you will live with. uPVC dominates on value and is fitted to the vast majority of UK homes; aluminium is slimmer, stronger and increasingly popular for a modern look; timber is the premium, heritage choice that asks for repainting in return. The table below shows fitted prices for a single standard casement window.
| Frame material | Fitted per window (2026) | vs uPVC |
|---|---|---|
| uPVC | £350–£650 | Baseline |
| Aluminium | £600–£850 | +30–40% |
| Timber (softwood/hardwood) | £900–£1,400 | +60–110% |
uPVC is virtually maintenance-free and the cheapest like-for-like replacement, which is why it accounts for most quotes. Aluminium carries a slim-sightline, powder-coated finish that suits contemporary extensions and large panes, and it will not rust or warp. Timber is often a conservation area or listed-building requirement rather than a free choice, so flag it up front when you request quotes. A quality installation of any material should last 20–35 years.
How much is double glazing by window style?
After material, the window style is the next big lever on price — a plain casement is the cheapest, while sash and bay windows carry more glass, more hardware and more labour. These are typical uPVC fitted prices per window; aluminium and timber scale up from here using the multipliers above.
| Window style | Fitted per window (uPVC, 2026) | Notes |
|---|---|---|
| Casement | £350–£650 | Most common, best value |
| Tilt & turn | £400–£700 | Inward-opening, easy cleaning |
| Sash (vertical slider) | £600–£1,200 | Period look; ~50% more than casement |
| Bay window | £800–£1,500 | Per bay; structural work adds £500–£1,500 |
A double-glazed bay window can cost up to 150% more than a plain casement because it is effectively several windows joined at angles, sometimes on a load-bearing frame. If the existing bay or the roof above it needs reinforcement, expect structural costs on top — always ask the installer to price that separately so you can compare quotes fairly. For period homes, our dedicated sash window cost guide breaks the numbers down further.
What does double glazing cost for a whole house?
Most homeowners replace every window at once to lock in one price, one visit and a single FENSA/CERTASS certificate. Whole-house cost depends on the number and size of windows and the material. The table below assumes standard sizes and normal access.
| Home size | uPVC | Aluminium | Timber |
|---|---|---|---|
| Flat / 1–2 bed (3–5 windows) | £1,500–£3,500 | £2,800–£5,500 | £4,000–£8,000 |
| 3-bed semi (8–10 windows) | £4,000–£6,000 | £7,000–£10,000 | £10,000–£16,000 |
| 4–5 bed detached (12–15 windows) | £6,000–£10,000 | £10,000–£16,000 | £15,000–£28,000 |
Where you live matters: London and the South-East typically run 15–25% above these national figures, while parts of the North, Wales and Scotland sit a little below. Bundling doors into the same job usually earns a better per-unit rate, so if you are also replacing a front or patio door, mention it on the form. You can sense-check any quote against the double glazing cost calculator before you commit.
What is an A++ window energy rating, and what do I need?
Windows in the UK are scored on the Window Energy Rating (WER) scale run by the British Fenestration Rating Council (BFRC), running from A++ (most efficient) down to G. The rating combines how much heat the window loses (its U-value), how much free solar heat it lets in, and how airtight it is. A separate but related number, the whole-window U-value in W/m²K, is what Building Regulations actually test against — lower is better.
| Energy rating | Typical U-value (W/m²K) | Building Regs (Part L) |
|---|---|---|
| A++ (best) | 0.8–1.0 | Exceeds requirement |
| A+ / A | 1.0–1.2 | Comfortably compliant |
| B (minimum allowed) | 1.2–1.4 | Meets the standard |
| C and below | Above 1.4 | Not compliant for replacements |
Under Approved Document L, replacement windows in an existing home must reach a whole-window U-value of 1.4 W/m²K or better, or WER band B as the alternative route; new-build dwellings must hit 1.2. In practice a good double-glazed unit clears this easily thanks to Low-E glass, a warm-edge spacer bar and argon gas in the sealed cavity — so you do not need triple glazing to comply. Paying to jump from B to A++ typically adds a modest amount per window and shaves a little more off your heating bills; ask each installer to quote the WER band and U-value so you are comparing like for like.
Do I need FENSA or CERTASS certification?
Yes. Replacing windows is notifiable work under Building Regulations. Rather than involve council building control on every job, most installers are members of a Competent Person Scheme — the two big ones are FENSA and CERTASS. A registered installer self-certifies that the work meets the regulations and registers it with your local authority, and you receive a certificate by post or email.
That certificate matters when you come to sell or remortgage — conveyancing solicitors routinely ask for it, and its absence can stall a sale or force an indemnity policy. Every installer we match you with is asked to confirm FENSA or CERTASS registration and public liability insurance, so you are not left chasing paperwork later. Not sure whether your job is notifiable? You can ask a building expert for free and we’ll publish the answer for other homeowners too.
How do I avoid double glazing pressure-sales scams?
Double glazing has a long-standing reputation for high-pressure selling, and while most installers are honest, the tactics still surface. Getting quotes online and comparing them at your own pace is the single best defence — there is no salesperson on your sofa at 9pm. Watch for these classic red flags:
- “Today only” discounts. A genuine price does not evaporate at midnight. A huge “manager’s special” if you sign tonight usually means the starting price was inflated.
- Refusing to leave a written quote. Any legitimate installer will give you the figures in writing to take away and compare. If they won’t, walk away.
- Large up-front deposits. Never pay a big deposit before work starts — tie payments to completed stages, and use a card for consumer protection on larger amounts.
- Vague specifications. A quote that doesn’t state the frame material, glass spec, WER band, guarantee length and whether FENSA/CERTASS is included isn’t comparable — and vagueness hides where corners are cut.
- Cold-call “free surveys”. Unsolicited doorstep or phone offers are the classic route into a pressure sale. You are always in control when you request the quotes.
Because you approach up to three vetted, insured installers on your terms — and can check their standing on our customer reviews pages — the balance of power sits with you, not a commissioned salesperson.
What should a good double glazing quote itemise?
Always get the quote in writing with a clear scope, and confirm the installer is insured and offers a workmanship guarantee (10 years is common, often insurance-backed). A quote you can genuinely compare will spell out:
- The exact number, sizes and styles of windows, so all three quotes cover the same job.
- The frame material and colour/finish, and the glass specification — Low-E, argon fill, warm-edge spacer.
- The WER band and U-value (aim for A-rated or better), plus any acoustic or safety-glass upgrades.
- Whether removal and disposal of the old windows and making-good of plaster/render are included.
- Whether FENSA or CERTASS registration and the certificate are included in the price.
- The guarantee length, deposit terms and a realistic lead time (typically 2–6 weeks from order to fit).
If you are combining windows with other work — a rewire, extension or new opening — our vetted trusted local builders and electricians can quote alongside so the trades don’t clash on site.
Why compare double glazing quotes with BestBuilders?
- Vetted, insured specialists. We only match you with FENSA/CERTASS-registered installers who cover your area and are rated by real customers.
- Real scope for savings. Fitted prices for the same uPVC window range from £350 to £650, and whole houses swing by thousands — three quotes is the simplest way to land at the right end of that range.
- One form, not five showroom visits. Submit your job once and the installers come to you, on your timetable.
- Free and no-obligation. If no quote suits, walk away — it costs you nothing, and no salesperson calls unless you ask.
Double glazing quotes — FAQs
Supplied and fitted, a standard uPVC casement window costs £350–£650, aluminium £600–£850 and timber £900–£1,400. For a whole home, expect £1,500–£3,500 for a small flat, £4,000–£6,000 for a 3-bed semi and £6,000–£10,000 for a large detached in uPVC. London and the South-East typically add 15–25%.
Yes. You describe your windows once using the online form, we match you with up to three vetted, insured, FENSA/CERTASS-registered installers in your area, and they send their quotes — most within 24 hours. It is completely free, there is no obligation to accept any quote, and no salesperson visits unless you invite one.
Three. With fitted prices for the same uPVC window ranging from £350 to £650, and whole-house totals swinging by thousands, comparing three written quotes on a like-for-like specification is the simplest way to avoid overpaying. Every quote you request through BestBuilders is free and no-obligation.
uPVC offers the best value and is virtually maintenance-free, which is why most UK homes choose it. Aluminium costs 30–40% more but gives slim sightlines and great strength for large or modern windows. Timber costs 60–110% more and suits period or conservation-area homes but needs repainting every few years. All three can achieve an A-rated or better energy rating.
Yes. Replacement windows are notifiable under Building Regulations, so the work must be either signed off by council building control or self-certified by a FENSA- or CERTASS-registered installer, who then issues you a certificate. That certificate is routinely requested when you sell or remortgage, so always use a registered installer — every installer we match you with is asked to confirm their registration.
A++ is the highest Window Energy Rating on the BFRC scale, which runs from A++ down to G. A++ windows typically have a whole-window U-value of 0.8–1.0 W/m²K. Building Regulations require replacement windows to reach at least 1.4 W/m²K or WER band B, so any A-rated or better window comfortably complies while cutting more heat loss.
Compare written quotes online at your own pace rather than signing on the spot. Be wary of “today only” discounts, refusals to leave a written quote, large up-front deposits and vague specifications. Never pay a big deposit before work starts, tie payments to completed stages, and check the installer’s reviews and FENSA/CERTASS status before you commit.
Usually no — like-for-like replacement is normally permitted development. However, planning permission or extra rules apply if your home is listed, in a conservation area, or if you significantly change the size or appearance of an opening. Building Regulations always apply, which the FENSA/CERTASS certificate covers. If you are unsure, check our planning guide or ask a building expert for free.
Once you place the order, made-to-measure windows typically have a 2–6 week lead time, then fitting takes 1–3 days for an average home — roughly 30–60 minutes per standard window. The installer removes the old units, fits and seals the new ones, makes good the surrounding plaster or render, and registers the work with FENSA or CERTASS afterwards.
Ready for your 3 free double glazing quotes?
Tell us about your windows once — how many, the material and style, and your postcode — and up to 3 vetted, insured, FENSA/CERTASS-registered installers will respond with free, no-obligation quotes, most within 24 hours.
Prefer to research first? Jump back to the quote form, read the full double glazing cost guide, try the cost calculator, or browse our home-improvement guides.
Written by the BestBuilders Editorial Team. Reviewed by a FENSA-registered glazing installer and window surveyor with over 15 years fitting uPVC, aluminium and timber double glazing across UK homes. Last updated: July 2026.
How we produced this guide: Prices are compiled from 2026 UK supplied-and-fitted quote data across multiple installers and cross-checked against published industry cost guides, then expressed as ranges because every job differs by size, glass spec, access and region. Energy-rating and Building Regulations figures are taken directly from GOV.UK Approved Document L and the BFRC rating scheme. We never invent specific supplier prices; where an exact figure is not publishable we give a defensible range and cite the standard behind it.