- Companies
- Installers
- Chislehurst
- Keystone Building Works Ltd
Keystone Building Works Ltd
- Company number
- 17099544
- Incorporated
- 18 Mar 2026
- Registered office
- 10A High Street, Chislehurst, BR7 5AN
- Nature of business
- Other construction installation
Keystone Building Works Ltd is a newly incorporated private limited company registered in Chislehurst, company number 17099544, one of 11 installation companies (insulation, lifts, shutters and similar) in Chislehurst. Its next accounts are due at Companies House on 18 December 2027, and its first CT600 is due at HMRC on 17 March 2028.
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 Building Works Ltd is registered
The registered office is in Chislehurst (BR7), in the Bromley local authority area, London. Show BR7 5AN on a map.
Other trade companies in BR7
- KG Fire & Construction LtdBuilders
- Ne Car and Commericials LtdMechanics and garages
- Magac - Bespoke Renovations LimitedBuilders
- Developwise Property Group LimitedProperty developers
- Chislehurst Renovations LtdBuilders
- Integra Building Compliance LtdSpecialist contractors
- Project 10 LtdBuilders
- Perryvale Acquisition LtdProperty developers
Shared registered office
65 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Keystone Building Works 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 18 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 19 Dec 2027 to 18 Jan 2028 | £150 |
| 1 to 3 months late | 19 Jan 2028 to 18 Mar 2028 | £375 |
| 3 to 6 months late | 19 Mar 2028 to 18 Jun 2028 | £750 |
| More than 6 months late | From 19 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 17099544
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 March 2026
- Registered office
- 10A High Street, Chislehurst, BR7 5AN
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 20 July 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 Chislehurst
Other active installation companies (insulation, lifts, shutters and similar) registered in Chislehurst.
- Onyx Building and Landscaping Ltd2022
- Policy Property Services Ltd2018
- S D Developments Limited2020
- Thames Gas Heating Electrical Ltd2021
- VD Interiors Limited2010
- Vision Home Developments Limited2025
- Yhb Contracts Limited2015
- Amp Building Services Ltd2017
All installation companies (insulation, lifts, shutters and similar) in Chislehurst · All trades in Chislehurst · Installers across the UK
Frequently asked questions
When are Keystone Building Works Ltd's accounts due?
Keystone Building Works Ltd's next accounts are due at Companies House by 18 December 2027 (in 431 days), covering the period to 31 March 2027.
When is Keystone Building Works 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 17 March 2027, due by 17 March 2028, and one for the period to 31 March 2027, due by 31 March 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone Building Works Ltd still trading?
Keystone Building Works 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 Keystone Building Works Ltd do?
Keystone Building Works Ltd is registered under Other construction installation (SIC 43290).
How old is Keystone Building Works Ltd?
Keystone Building Works Ltd was incorporated on 18 March 2026, less than a year ago.
What is the penalty if Keystone Building Works 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 Keystone Building Works 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.