- Companies
- Installers
- Potters Bar
- Keystone Property Maintenance London Ltd
Keystone Property Maintenance London Ltd
- Company number
- 16670001
- Incorporated
- 25 Aug 20251 year trading
- Registered office
- 249 Mutton Lane, Potters Bar, EN6 2AT
- Nature of business
- Other construction installation
Keystone Property Maintenance London Ltd is a 1-year-old private limited company registered in Potters Bar, company number 16670001, one of 17 installation companies (insulation, lifts, shutters and similar) in Potters Bar. Its next accounts are due at Companies House on 25 May 2027, and its first CT600 is due at HMRC on 24 August 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?
File the first accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Keystone Property Maintenance London LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Where Keystone Property Maintenance London Ltd is registered
The registered office is in Potters Bar (EN6), in the Hertsmere local authority area, East of England. Show EN6 2AT on a map.
Other trade companies in EN6
- Hertfordshire Roofing and Guttering Repairs LtdRoofers
- Vata RC Frames LtdSpecialist contractors
- Avanti Airtech LimitedPlumbers and heating engineers
- Azmaj Group LtdFinishing trades
- Burbridge Roofing and Build LtdBuilders
- Roman Way Holdings LtdProperty developers
- Westshire Property Services LimitedFinishing trades
- Oska Auto LtdMechanics and garages
What happens if Keystone Property Maintenance London 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 25 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 26 May 2027 to 25 Jun 2027 | £150 |
| 1 to 3 months late | 26 Jun 2027 to 25 Aug 2027 | £375 |
| 3 to 6 months late | 26 Aug 2027 to 25 Nov 2027 | £750 |
| More than 6 months late | From 26 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 16670001
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 August 2025 (1 year ago)
- Registered office
- 249 Mutton Lane, Potters Bar, EN6 2AT
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
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 Potters Bar
Other active installation companies (insulation, lifts, shutters and similar) registered in Potters Bar.
- Marsh Building Services Ltd2019
- Pools and Leisure Services Ltd2021
- Siv Fire Protection Ltd2010
- The London Loft Family Ltd2023
- Unique Interiors Ltd1997
- Vata Groundworks Ltd2021
- Vsa Scaffolding Ltd2020
- A1 Renovations Ltd2026
All installation companies (insulation, lifts, shutters and similar) in Potters Bar · All trades in Potters Bar · Installers across the UK
Frequently asked questions
When are Keystone Property Maintenance London Ltd's accounts due?
Keystone Property Maintenance London Ltd's next accounts are due at Companies House by 25 May 2027 (in 224 days), covering the period to 31 August 2026.
When is Keystone Property Maintenance London 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 24 August 2026, due by 24 August 2027, and one for the period to 31 August 2026, due by 31 August 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone Property Maintenance London Ltd still trading?
Keystone Property Maintenance London Ltd is listed as active on the Companies House register (checked 13 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 Property Maintenance London Ltd do?
Keystone Property Maintenance London Ltd is registered under Other construction installation (SIC 43290).
How old is Keystone Property Maintenance London Ltd?
Keystone Property Maintenance London Ltd was incorporated on 25 August 2025, 1 year ago.
What is the penalty if Keystone Property Maintenance London 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 Property Maintenance London Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.