- Companies
- Specialist contractors
- Portsmouth
- A.D. Mechanical Services Limited
A.D. Mechanical Services Limited
- Company number
- 04128697
- Incorporated
- 20 Dec 200025 years trading
- Registered office
- 8-10 Portsmouth Road, Cosham, Portsmouth, Hampshire, PO6 2AE
- Nature of business
- Other specialised construction activities n.e.c.; Fire service activities
A.D. Mechanical Services Limited is a 25-year-old private limited company registered in Portsmouth, company number 04128697, one of 193 specialist construction companies in Portsmouth. Its next accounts are due at Companies House on 30 November 2027, and the CT600 for the period to 28 February 2027 is due at HMRC on 28 February 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 £238K (-8.7%) on the year before, to £2.5M.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £3.7M against £1.3M owed within a year: 2.9 times cover.
- 40 employees on average, down from 41 the year before.
- 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 |
|---|---|---|---|---|---|
| 28 Feb 2026 | £2.5M | £465K | £3.7M | £1.3M | 40 |
| 28 Feb 2025 | £2.7M | £826K | £3.5M | £854K | 41 |
| 29 Feb 2024 | £2.6M | £1.4M | £4.2M | £1.7M | 40 |
| 28 Feb 2023 | £2.2M | £594K | £3.8M | £1.7M | 40 |
| 28 Feb 2022 | £1.8M | £577K | £2.7M | £1.1M | 42 |
| 28 Feb 2021 | £2.2M | £1.4M | £3.7M | £1.3M | 44 |
| 29 Feb 2020 | £1.9M | £231K | £3.5M | £1.9M | 48 |
| 28 Feb 2019 | £1.7M | £874K | £3.2M | £1.5M | 46 |
| 28 Feb 2018 | £1.5M | £491K | £2.5M | £1M | 46 |
| 28 Feb 2017 | £1.3M | £722K | £2.4M | £1.1M | 42 |
Who runs and owns A.D. Mechanical Services Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (4)
| Name | Role | Appointed |
|---|---|---|
| A*** T*** | Director | Dec 2000 |
| M*** T*** | Director | May 2021 |
| G*** T*** | Director | May 2021 |
| L*** T*** | Director | Sep 2024 |
7 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| D*** G*** | Nominee Secretary | Dec 2000 | Dec 2000 |
| A*** T*** | Secretary | Dec 2000 | Jul 2002 |
| L*** T*** | Secretary | Jul 2002 | May 2014 |
| G*** C*** | Director | May 2021 | Aug 2022 |
| L*** G*** | Nominee director | Dec 2000 | Dec 2000 |
| S*** M*** | Director | Nov 2022 | Jul 2025 |
| D*** W*** | Director | Dec 2000 | Jul 2002 |
Person with significant control
Charges (secured borrowing)
1 of 2 registered charges are outstanding. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| Lloyds Bank PLC | Outstanding | Oct 2015 |
| National Westminster Bank PLC | Satisfied Oct 2015 | Sep 2003 |
Public contracts won
A.D. Mechanical Services Limited has 2 public sector contract awards on record; the ones with their own published value total £26K, from 2022 to 2025. Source: Contracts Finder and Find a Tender award notices. For 1 of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. These were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Hampshire County Council2 awards
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Hampshire County Council | MWF Lot 6 DA - Uplands Primary School - Heating Upgrades Year R - AWARD | £26K | 30 Jan 2025 |
| Hampshire County Council | Minor Works Framework 2021-2025 - AWARD | Ceiling, not shown | 27 Jan 2022 |
Where A.D. Mechanical Services Limited is registered
The registered office is in Portsmouth (PO6), in the Portsmouth local authority area, South East. Show PO6 2AE on a map.
Other trade companies in PO6
- Bellagio Partners LtdBuilders
- Cpenw LtdMachinery repair and installation
- Marla Brickwork & Construction LtdProperty developers
- Miracles in Metal LtdMechanics and garages
- FH Fire & Electrical LtdElectricians
- Thomcore LimitedSpecialist contractors
- JMS Southern LtdElectricians
- The Motum Group LtdSpecialist contractors
What happens if A.D. 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 30 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2027 to 31 Dec 2027 | £150 |
| 1 to 3 months late | 1 Jan 2028 to 29 Feb 2028 | £375 |
| 3 to 6 months late | 1 Mar 2028 to 31 May 2028 | £750 |
| More than 6 months late | From 1 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Feb 2028 | £200 |
| 3 months late | 28 May 2028 | another £200 |
| 6 months late | 28 Aug 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 04128697
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 December 2000 (25 years ago)
- Registered office
- 8-10 Portsmouth Road, Cosham, Portsmouth, Hampshire, PO6 2AE
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
Fire service activities (SIC 84250) - Year end
- 28 February (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 28 February 2026
- Last confirmation statement
- 20 December 2025
- Charges (mortgages)
- 1 outstanding of 2 registered
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Portsmouth
Other active specialist construction companies registered in Portsmouth.
- A2B Rapid Response Groundworks and Landscaping Ltd2025
- A2B Rapid Response Property Services Ltd2026
- Aa Operations (South) Ltd2018
- Absolute Construction (Southern) Limited2022
- Ace Line Paving Limited2007
- Addob.Projects Ltd2023
- Aif Marine Ltd2022
- Allsteel Solutions Limited2025
All specialist construction companies in Portsmouth · All trades in Portsmouth · Specialist contractors across the UK
Frequently asked questions
When are A.D. Mechanical Services Limited's accounts due?
A.D. Mechanical Services Limited's next accounts are due at Companies House by 30 November 2027 (in 414 days), covering the period to 28 February 2027.
When is A.D. Mechanical Services Limited's CT600 due?
The CT600 for the period to 28 February 2027 is due at HMRC by 28 February 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2027.
Is A.D. Mechanical Services Limited still trading?
A.D. 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 A.D. Mechanical Services Limited do?
A.D. Mechanical Services Limited is registered under Other specialised construction activities n.e.c. (SIC 43999); Fire service activities (SIC 84250).
How old is A.D. Mechanical Services Limited?
A.D. Mechanical Services Limited was incorporated on 20 December 2000, 25 years ago.
Who runs A.D. Mechanical Services Limited?
A.D. Mechanical Services Limited has 4 active directors, the longest-serving appointed in Dec 2000. Their names and service addresses are on the Companies House register.
Who owns A.D. Mechanical Services Limited?
One person or company has significant control of A.D. Mechanical Services Limited: Tilley Investments Limited (owns 75% or more of the shares).
Has A.D. Mechanical Services Limited won public sector contracts?
Yes. A.D. Mechanical Services Limited has 2 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £26K), most recently from Hampshire County Council.
What is the penalty if A.D. 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 A.D. 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.