- Companies
- Installers
- Beaconsfield
- Keystone Buildworks Limited
Keystone Buildworks Limited
- Company number
- 16302571
- Incorporated
- 9 Mar 20251 year trading
- Registered office
- 2 Greenwood Close, Seer Green, Beaconsfield, HP9 2SL
- Nature of business
- Other construction installation
Keystone Buildworks Limited is a 1-year-old private limited company registered in Beaconsfield, company number 16302571, one of 9 installation companies (insulation, lifts, shutters and similar) in Beaconsfield. Its next accounts are due at Companies House on 9 December 2026, and its first CT600 is due at HMRC on 8 March 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.
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Where Keystone Buildworks Limited is registered
The registered office is in Beaconsfield (HP9), in the Buckinghamshire local authority area, South East. Show HP9 2SL on a map.
Other trade companies in HP9
- 8Square Group LimitedMotor traders
- Word & Deed Services LimitedCleaning companies
- Lumensite LtdMachinery repair and installation
- Daniel Gosling 32 LtdProperty developers
- Chiltern Energy Group LtdElectricians
- Sle Builder LtdFinishing trades
- Hde Construction LtdProperty developers
- UK Roofing Group LtdRoofers
What happens if Keystone Buildworks Limited 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 9 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 10 Dec 2026 to 9 Jan 2027 | £150 |
| 1 to 3 months late | 10 Jan 2027 to 9 Mar 2027 | £375 |
| 3 to 6 months late | 10 Mar 2027 to 9 Jun 2027 | £750 |
| More than 6 months late | From 10 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 16302571
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 March 2025 (1 year ago)
- Registered office
- 2 Greenwood Close, Seer Green, Beaconsfield, HP9 2SL
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 8 March 2026
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Beaconsfield
Other active installation companies (insulation, lifts, shutters and similar) registered in Beaconsfield.
- Pinnacle Fire Protection Ltd2018
- Rock & Roll Constructions Ltd2014
- Warwick Garage Doors Limited2018
- Dynamic Labour Limited2022
- Falcon Arms Ltd2015
- Fast Track Interiors Ltd2006
- I & B Construction Limited2014
- Jib Woodwork Ltd2025
All installation companies (insulation, lifts, shutters and similar) in Beaconsfield · All trades in Beaconsfield · Installers across the UK
Frequently asked questions
When are Keystone Buildworks Limited's accounts due?
Keystone Buildworks Limited's next accounts are due at Companies House by 9 December 2026 (in 57 days), covering the period to 31 March 2026.
When is Keystone Buildworks Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 8 March 2026, due by 8 March 2027, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone Buildworks Limited still trading?
Keystone Buildworks Limited 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 Keystone Buildworks Limited do?
Keystone Buildworks Limited is registered under Other construction installation (SIC 43290).
How old is Keystone Buildworks Limited?
Keystone Buildworks Limited was incorporated on 9 March 2025, 1 year ago.
What is the penalty if Keystone Buildworks Limited 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 Keystone Buildworks Limited 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.