- Companies
- Joiners and carpenters
- Grantham
- Key Windows Ltd
Key Windows Ltd
- Company number
- 16700925
- Incorporated
- 8 Sep 20251 year trading
- Registered office
- 164 Harrowby Lane, Grantham, NG31 9NR
- Nature of business
- Joinery installation; Glazing
Key Windows Ltd is a 1-year-old private limited company registered in Grantham, company number 16700925, one of 14 joinery companies in Grantham. Its next accounts are due at Companies House on 8 June 2027, and its first CT600 is due at HMRC on 7 September 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
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Where Key Windows Ltd is registered
The registered office is in Grantham (NG31), in the South Kesteven local authority area, East Midlands. Show NG31 9NR on a map.
Other trade companies in NG31
- Joacc LtdPlasterers
- Rka Fire Doors LtdJoiners and carpenters
- CS Bathroom & Kitchen Company LtdPlumbers and heating engineers
- Buildable Civils LtdBuilders
- Luper Heating & Plumbing LimitedPlumbers and heating engineers
- Motorcycle Reclamation LtdMotor traders
- Webster Developments 7 LtdProperty developers
- Autozoo LtdMotor traders
What happens if Key Windows Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 8 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 9 Jun 2027 to 8 Jul 2027 | £150 |
| 1 to 3 months late | 9 Jul 2027 to 8 Sep 2027 | £375 |
| 3 to 6 months late | 9 Sep 2027 to 8 Dec 2027 | £750 |
| More than 6 months late | From 9 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 16700925
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 September 2025 (1 year ago)
- Registered office
- 164 Harrowby Lane, Grantham, NG31 9NR
- Nature of business
- Joinery installation (SIC 43320)
Glazing (SIC 43342) - Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 7 September 2026
Filing notes for joinery companies
Joinery companies can carry stock and work in progress at the year end, especially bespoke workshop work, and that figure moves the profit for the year.
Similar companies in Grantham
Other active joinery companies registered in Grantham.
- Musson Joinery Limited2001
- N Salmon Limited2015
- Nis Developments Limited2009
- Rka Fire Doors Ltd2026
- Trew Turner Limited2013
- Blyth Carpentry and Joinery Ltd2014
- BPS Joinery and Renovations Ltd2021
- Brooks and Sims Limited2002
All joinery companies in Grantham · All trades in Grantham · Joiners and carpenters across the UK
Frequently asked questions
When are Key Windows Ltd's accounts due?
Key Windows Ltd's next accounts are due at Companies House by 8 June 2027 (in 239 days), covering the period to 30 September 2026.
When is Key Windows Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 7 September 2026, due by 7 September 2027, and one for the period to 30 September 2026, due by 30 September 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Key Windows Ltd still trading?
Key Windows Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Key Windows Ltd do?
Key Windows Ltd is registered under Joinery installation (SIC 43320); Glazing (SIC 43342).
How old is Key Windows Ltd?
Key Windows Ltd was incorporated on 8 September 2025, 1 year ago.
What is the penalty if Key Windows Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Key Windows Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.