- Companies
- Plumbers and heating engineers
- Ruislip
- G S James Mechanical Services Ltd
G S James Mechanical Services Ltd
- Company number
- 05034819
- Incorporated
- 4 Feb 200422 years trading
- Registered office
- 34 Broadwood Avenue, Ruislip, Middlesex, HA4 7XR
- Nature of business
- Plumbing, heat and air-conditioning installation
G S James Mechanical Services Ltd is a 22-year-old private limited company registered in Ruislip, company number 05034819, one of 61 plumbing and heating companies in Ruislip. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 down £38K (-150.2%) on the year before, to -£13K.
- Net assets rose in 2 of 9 year-on-year comparisons on record.
- Current assets of £183K against £214K owed within a year: 0.9 times cover.
- 5 employees on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | -£13K | £183K | £214K | 5 | |
| 31 Mar 2025 | £25K | £206K | £194K | 5 | |
| 31 Mar 2024 | £33K | £383K | £339K | 9 | |
| 31 Mar 2023 | £70K | £273K | £163K | 9 | |
| 31 Mar 2022 | £79K | £302K | £176K | 9 | |
| 31 Mar 2021 | £60K | £244K | £310K | £207K | 6 |
| 31 Mar 2020 | £17K | £15K | £160K | £143K | 6 |
| 31 Mar 2019 | £28K | £2 | £353K | £267K | 6 |
| 31 Mar 2018 | £63K | £115K | £209K | £155K | 6 |
| 31 Mar 2017 | £98K | £163K | £251K | £166K | 5 |
Who runs and owns G S James Mechanical Services Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| G*** J*** | Director | Feb 2004 |
| V*** J*** | Secretary | Feb 2004 |
2 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| H*** W*** | Nominee Secretary | Feb 2004 | Feb 2004 |
| Y*** W*** | Nominee director | Feb 2004 | Feb 2004 |
Person with significant control
Public contracts won
G S James Mechanical Services Ltd has 8 public sector contract awards on record; the ones with their own published value total £1.8M, from 2018 to 2022. Source: Contracts Finder and Find a Tender award notices. These were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- London Borough of Ealing7 awards
- London Borough of Brent1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| London Borough of Ealing | EC1453 - Perivale Community Centre - Boilers | £109K | 26 Aug 2022 |
| London Borough of Ealing | EC1487 St Mark's Primary School - Boiler Replacement | £289K | 15 Jun 2022 |
| London Borough of Ealing | EC1442 Southfields Primary School Main building hot and cold water replacement | £261K | 8 Jul 2021 |
| London Borough of Ealing | EC1446 - Viking Primary School - Heating | £155K | 21 Jun 2021 |
| London Borough of Ealing | EC1432 - Lady Margaret Primary School | £170K | 15 Jun 2021 |
| London Borough of Brent | Mechanical Works at Lyon Park Primary School and the Mount Stewart School | £581K | 9 Jul 2020 |
| London Borough of Ealing | EC1282 - Perivale Primary School - Replacement Boilers, Pumps, etc | £108K | 13 Jun 2018 |
| London Borough of Ealing | EC1274 - Willow Tree Primary School | £144K | 13 Jun 2018 |
Where G S James Mechanical Services Ltd is registered
The registered office is in Ruislip (HA4), in the Hillingdon local authority area, London. Show HA4 7XR on a map.
Other trade companies in HA4
- SSC London LtdGroundworks and demolition
- DCR Industriltdal LtdPainters and decorators
- Katardino Monten for General Contracting and Supplies LtdCivil engineering
- Apex Build & Move LtdBuilders
- Ridgeway Building Contracts LimitedProperty developers
- Azya Farah LtdBuilders
- Howdens Roofing & Guttering LimitedRoofers
- Vetro Glazing LimitedGlaziers
What happens if G S James Mechanical Services 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 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
- 05034819
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 February 2004 (22 years ago)
- Registered office
- 34 Broadwood Avenue, Ruislip, Middlesex, HA4 7XR
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 4 February 2026
- Previous names
- G S James Plumbing & Heating Limited (until 16 Jan 2018)
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 Ruislip
Other active plumbing and heating companies registered in Ruislip.
- Green Gas Heating and Plumbing Ltd2025
- Harry's Heating Limited2021
- Hartnett Plumbing Ltd2024
- Holman Plumbing and Heating Ltd2020
- HSL (London) Ltd2013
- Igniteco Group Ltd2024
- Iwbs Plumbing & Heating Ltd2007
- J Mechanical Ltd2016
All plumbing and heating companies in Ruislip · All trades in Ruislip · Plumbers and heating engineers across the UK
Frequently asked questions
When are G S James Mechanical Services Ltd's accounts due?
G S James Mechanical Services Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is G S James Mechanical Services Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is G S James Mechanical Services Ltd still trading?
G S James Mechanical Services 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 G S James Mechanical Services Ltd do?
G S James Mechanical Services Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is G S James Mechanical Services Ltd?
G S James Mechanical Services Ltd was incorporated on 4 February 2004, 22 years ago.
Who runs G S James Mechanical Services Ltd?
G S James Mechanical Services Ltd has 1 active director, the longest-serving appointed in Feb 2004. Their names and service addresses are on the Companies House register.
Who owns G S James Mechanical Services Ltd?
One person or company has significant control of G S James Mechanical Services Ltd: an individual (holds 50% to 75% of the votes).
Has G S James Mechanical Services Ltd won public sector contracts?
Yes. G S James Mechanical Services Ltd has 8 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £1.8M), most recently from London Borough of Ealing.
What is the penalty if G S James Mechanical Services 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 G S James Mechanical Services 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.