Double glazing & home improvement costs in Northampton & Northamptonshire
Last reviewed: July 2026 · NN postcode area · Prices are fitted (supply + installation), incl. VAT
We match new and replacement windows enquiries across the NN postcode area — Northampton, Kettering, Wellingborough, Corby, Daventry, Rushden and the surrounding villages. Northamptonshire’s red-brick terraces and inter-war semis mostly take standard casement sizes, which keeps fitted prices close to the England average with healthy competition between local firms.
Window prices in Northampton (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.
Towns we cover in the NN postcode area
Northampton · Kettering · Wellingborough · Corby · Daventry · Rushden — plus the villages and rural districts on NN postcodes between them. Coverage is by postcode, so if your outcode starts with NN, the estimate tool will price your job and match you with companies that install there.
How well insulated are Northampton homes?
The official EPC register shows 169 of 433 certificated homes (39%) in the NN1 district (central Northampton) are rated band D or below — the bands where surveyors most often flag single glazing, failed units or poor draught-proofing (latest certificate per home, 10-year window, register checked 2026-08-05). The street segments with the most D–G rated homes:
| Street | Postcode | Homes rated D–G | Check it yourself |
|---|---|---|---|
| Billing Road | NN1 5DQ | 4 of 11 | public register |
| County Chambers | NN1 2ET | 4 of 12 | public register |
| Roe Road | NN1 4PJ | 3 of 4 | public register |
| Palmerston Road | NN1 5EU | 2 of 4 | public register |
| Military Road | NN1 3EU | 2 of 5 | public register |
If your home is rated D or below, upgrading old or failed glazing is one of the fixes EPC assessors most commonly recommend — check your own street with the postcode energy ratings checker, see what that saves in our energy savings guide, or price the job for your exact home with the instant estimate tool.
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 Northampton.
- 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 Northampton?
A standard uPVC casement window costs around £450–£750 fitted in the NN 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 Northampton and Kettering?
Yes — the installer networks we work with actively cover the whole NN postcode area, including Northampton, Kettering, Wellingborough, Corby, Daventry, Rushden. 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 Northampton & Northamptonshire — 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.