- Companies
- Plumbers and heating engineers
- Barnet
- Keystone Retrofit Group Ltd
Keystone Retrofit Group Ltd
- Company number
- 16989786
- Incorporated
- 27 Jan 2026
- Registered office
- 108 Westpole Avenue, Barnet, EN4 0BB
- Nature of business
- Plumbing, heat and air-conditioning installation; Other construction installation; Roofing activities; Other professional, scientific and technical activities n.e.c.
Keystone Retrofit Group Ltd is a newly incorporated private limited company registered in Barnet, company number 16989786, one of 75 plumbing and heating companies in Barnet. Its next accounts are due at Companies House on 27 October 2027, and its first CT600 is due at HMRC on 26 January 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 Retrofit Group Ltd is registered
The registered office is in Barnet (EN4), in the Enfield local authority area, London. Show EN4 0BB on a map.
Other trade companies in EN4
- Mechanica Frequentia Calculi LtdElectricians
- Conrad Cleaning LimitedCleaning companies
- Vreto & Co LtdCleaning companies
- Reclaim Automotive UK LtdMotor traders
- We Love 500'S LimitedMechanics and garages
- Vanta Gas & Heating LtdBuilders
- T C Developments LtdProperty developers
- Xran LtdBuilders
What happens if Keystone Retrofit Group 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 27 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 28 Oct 2027 to 27 Nov 2027 | £150 |
| 1 to 3 months late | 28 Nov 2027 to 27 Jan 2028 | £375 |
| 3 to 6 months late | 28 Jan 2028 to 27 Apr 2028 | £750 |
| More than 6 months late | From 28 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 16989786
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 January 2026
- Registered office
- 108 Westpole Avenue, Barnet, EN4 0BB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Other construction installation (SIC 43290)
Roofing activities (SIC 43910)
Other professional, scientific and technical activities n.e.c. (SIC 74909) - Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Barnet
Other active plumbing and heating companies registered in Barnet.
- Knebworth Plumbing Solutions Ltd2026
- Koolworks Ltd2021
- L&A Plumbing and Heating Ltd2023
- Leb Gas & Plumbing Ltd2025
- LJC Plumbing Limited2025
- London Renew & Refurb Limited2018
- Mac & Weld Limited2020
- Mark Payne Plumbing & Heating Specialist Ltd2013
All plumbing and heating companies in Barnet · All trades in Barnet · Plumbers and heating engineers across the UK
Frequently asked questions
When are Keystone Retrofit Group Ltd's accounts due?
Keystone Retrofit Group Ltd's next accounts are due at Companies House by 27 October 2027 (in 379 days), covering the period to 31 January 2027.
When is Keystone Retrofit Group 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 26 January 2027, due by 26 January 2028, and one for the period to 31 January 2027, due by 31 January 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone Retrofit Group Ltd still trading?
Keystone Retrofit Group 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 Retrofit Group Ltd do?
Keystone Retrofit Group Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Other construction installation (SIC 43290); Roofing activities (SIC 43910); Other professional, scientific and technical activities n.e.c. (SIC 74909).
How old is Keystone Retrofit Group Ltd?
Keystone Retrofit Group Ltd was incorporated on 27 January 2026, less than a year ago.
What is the penalty if Keystone Retrofit Group 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 Retrofit Group 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.