Double glazing installers in Grantham
5 companies have a registered office in Grantham under the glazing trade (SIC code 43342).
Extract from the public Companies House register (glazing trade, SIC 43342) - not a recommendation or a vetted panel. Select a company for its full register entry and local context.
| Company | Area | Registered | Accounts filed | Details |
|---|---|---|---|---|
| Avanti Windows LimitedLtd · no. 02214699 | NG31 | 1988 | 2025 | View details → |
| John Loosemore Glazing LimitedLtd · Micro · no. 04689455 | NG31 | 2003 | 2025 | View details → |
| Belvoir Windows LimitedLtd · Small · no. 06759036 | NG31 | 2008 | 2025 | View details → |
| Key Windows LtdLtd · no. 16700925 | NG31 | 2025 | — | View details → |
| Arhipro Glazing LtdLtd · no. 17076199 | NG31 | 2026 | — | View details → |
Source: Companies House free company data - SIC 43342, active companies, with dormant and long-overdue filers removed. Company status and details can change; check the register for the current position.
How to choose between them
A whole-home job in Grantham typically runs £2,600 to £7,700 (local cost factor 0.85×), so the spread between three quotes on the same brief is worth chasing. Georgian High Street townhouses, Victorian terraces around Belton Lane, plus interwar semis in Barrowby Gate and Great Gonerby.
Heritage note: Around 10 conservation areas including central Grantham.
Whichever company you approach: get three written, itemised quotes, confirm FENSA or CERTASS registration on the scheme's own register, check the guarantee is insurance-backed, and ask for two recent local installs you can look at. Our guide to comparing double glazing quotes walks through it.