- Companies
- Plumbers and heating engineers
- London
- J.A. Sylvester (Mechanical Services) Limited
J.A. Sylvester (Mechanical Services) Limited
- Company number
- 01247215
- Incorporated
- 4 Mar 197650 years trading
- Registered office
- 34 Arlington Road, Camden, London, NW1 7HU
- Nature of business
- Plumbing, heat and air-conditioning installation
J.A. Sylvester (Mechanical Services) Limited is a 50-year-old private limited company registered in London, company number 01247215, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £90K (+23.3%) on the year before, to £474K.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £2.1M against £1.6M owed within a year: 1.3 times cover.
- 9 employees on average, up from 8 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Aug 2025 | £474K | £439K | £2.1M | £1.6M | 9 |
| 31 Aug 2024 | £385K | £478K | £767K | £421K | 8 |
| 31 Aug 2023 | £315K | £479K | £945K | £656K | 8 |
| 31 Aug 2022 | £185K | £263K | £684K | £529K | 8 |
| 31 Aug 2021 | £134K | £172K | £568K | £431K | 8 |
| 31 Aug 2020 | £120K | £316K | £749K | £518K | 8 |
| 31 Aug 2019 | £203K | £339K | £830K | £662K | 8 |
| 31 Aug 2018 | £241K | £331K | £534K | £321K | 8 |
| 31 Aug 2017 | £132K | £189K | £702K | £599K | 9 |
| 31 Aug 2016 | £120K | £358K | £987K | £889K |
Where J.A. Sylvester (Mechanical Services) Limited is registered
The registered office is in London (NW1), in the Camden local authority area, London. Show NW1 7HU on a map.
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Also registered at this address
3 other companies use the same registered office as J.A. Sylvester (Mechanical Services) Limited.
- Dax Developments LtdBuilders
- Premier Clean 2000 LtdCleaning companies
- Propertk LtdBuilders
What happens if J.A. Sylvester (Mechanical Services) 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 31 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 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
- 01247215
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 March 1976 (50 years ago)
- Registered office
- 34 Arlington Road, Camden, London, NW1 7HU
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 23 July 2026
- Charges (mortgages)
- 0 outstanding of 5 registered
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 London
Other active plumbing and heating companies registered in London.
- J.I.M Heating & Plumbing Ltd2024
- J.K Gas & Plumbing Ltd2022
- J.L.P. Maintenance Services Ltd2017
- J.R.E. Dinnage Limited1965
- J.R.M Gas Ltd2017
- Jac Plumbing & Heating Services Ltd2020
- Jack Greenford Limited2007
- James A. Turner Limited1987
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are J.A. Sylvester (Mechanical Services) Limited's accounts due?
J.A. Sylvester (Mechanical Services) Limited's next accounts are due at Companies House by 31 May 2027 (in 230 days), covering the period to 31 August 2026.
When is J.A. Sylvester (Mechanical Services) Limited's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is J.A. Sylvester (Mechanical Services) Limited still trading?
J.A. Sylvester (Mechanical Services) 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 J.A. Sylvester (Mechanical Services) Limited do?
J.A. Sylvester (Mechanical Services) Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is J.A. Sylvester (Mechanical Services) Limited?
J.A. Sylvester (Mechanical Services) Limited was incorporated on 4 March 1976, 50 years ago.
What is the penalty if J.A. Sylvester (Mechanical Services) 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 J.A. Sylvester (Mechanical Services) 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.