Double glazing & home improvement costs in St Albans & mid Hertfordshire
Last reviewed: July 2026 · AL postcode area · Prices are fitted (supply + installation), incl. VAT
We match new and replacement windows, external doors enquiries across the AL postcode area — St Albans, Harpenden, Hatfield, Welwyn Garden City, London Colney, Wheathampstead and the surrounding villages. St Albans and Harpenden sit at the premium end of Hertfordshire’s market — period homes and conservation areas steer choices towards heritage styles — while Hatfield and Welwyn Garden City’s planned estates take standard casement replacements.
Window prices in St Albans (per window, fitted)
| Frame material | Price per window | Notes |
|---|---|---|
| uPVC casement | £450 – £750 | Best value; the UK default |
| Aluminium | £650 – £1,100 | Slim frames, modern look |
| Timber | £850 – £1,500 | Period homes & conservation areas |
Whole-house jobs come in cheaper per window — see how counts, property type and materials move the price in our full window cost guide, or get a range for your exact home with the instant estimate tool.
External door prices in St Albans (fitted)
| Door type | Fitted price |
|---|---|
| uPVC front or back door | £800 – £1,400 |
| Composite front door | £900 – £2,000 |
| French doors | £1,200 – £2,400 |
| Sliding patio doors | £1,400 – £2,800 |
Full breakdown by material and style in the door cost guide, or price your door with the estimate tool.
Towns we cover in the AL postcode area
St Albans · Harpenden · Hatfield · Welwyn Garden City · London Colney · Wheathampstead — plus the villages and rural districts on AL postcodes between them. Coverage is by postcode, so if your outcode starts with AL, the estimate tool will price your job and match you with companies that install there.
How it works
- Instant estimate first — answer a few questions and see a realistic fitted price range for your home, no contact details needed.
- Quotes only if you ask — with your consent we share your enquiry with up to 4 FENSA/CERTASS-registered installation companies and vetted networks covering St Albans.
- No obligation — compare quotes against the bands above and walk away if none stack up. See how we make money.
Frequently asked questions
How much does double glazing cost in St Albans?
A standard uPVC casement window costs around £450–£750 fitted in the AL postcode area, aluminium £650–£1,100 and timber £850–£1,500 per window. Multi-window installs come in cheaper per window because survey, scaffold and labour are shared across the job.
Do you cover St Albans and Harpenden?
Yes — the installer networks we work with actively cover the whole AL postcode area, including St Albans, Harpenden, Hatfield, Welwyn Garden City, London Colney, Wheathampstead. Enter your postcode in the estimate tool and we match your enquiry to companies that install in your exact district.
Who actually fits the windows?
SnugQuote is a price-comparison and introduction service, not an installer. Your enquiry goes to up to 4 FENSA/CERTASS-registered installation companies and vetted home-improvement networks that operate across St Albans & mid Hertfordshire — they quote, you compare, and there is no obligation to proceed.
Sources: price bands compiled July 2026 from published UK installer price guides (Checkatrade, Which?, FMB cost guides), adjusted with the regional labour index used across this site, and cross-checked against regional quote data. Installer certification: FENSA. See all areas we cover.