- Companies
- Civil engineering
- Portsmouth
- International Mechanical Services Ltd
International Mechanical Services Ltd
- Company number
- 10256608
- Incorporated
- 29 Jun 201610 years trading
- Registered office
- 18 London Road, Portsmouth, PO2 0LH
- Nature of business
- Construction of other civil engineering projects n.e.c.
International Mechanical Services Ltd is a 10-year-old private limited company registered in Portsmouth, company number 10256608, one of 74 civil engineering contractors in Portsmouth. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 down £16K (-17.2%) on the year before, to £75K.
- Net assets rose in 4 of 8 year-on-year comparisons on record.
- 1 employee on average, up from 0 the year before.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £75K | £42K | £0 | 1 | |
| 30 Jun 2024 | £91K | £90K | £32K | 0 | |
| 30 Jun 2023 | £80K | £104K | £25K | 0 | |
| 30 Jun 2022 | £151K | £184K | £33K | 0 | |
| 30 Jun 2021 | £39K | £90K | £90K | £51K | 0 |
| 30 Jun 2020 | £93K | £104K | £106K | £13K | 0 |
| 30 Jun 2019 | £109K | £100K | £158K | £49K | |
| 30 Jun 2018 | £71K | £102K | £194K | £123K | |
| 30 Jun 2017 | £100 | £100 |
Where International Mechanical Services Ltd is registered
The registered office is in Portsmouth (PO2), in the Portsmouth local authority area, South East. Show PO2 0LH on a map.
Other trade companies in PO2
- South Coast Garden Rooms LtdBuilders
- Novira Automotive LtdMotor traders
- Tony Parrack Fire Protection LtdSpecialist contractors
- Bmgcarpentry LtdJoiners and carpenters
- LLPG Carpentry LtdBuilders
- Xyz Developments LtdProperty developers
- Eco Amend Maintenance Service LtdFinishing trades
- Manila Haulage LtdMechanics and garages
Also registered at this address
2 other companies use the same registered office as International Mechanical Services Ltd.
- Carscom LimitedMotor traders
- Sec GB&NI LtdSpecialist contractors
What happens if International 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 10256608
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 June 2016 (10 years ago)
- Registered office
- 18 London Road, Portsmouth, PO2 0LH
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 19 January 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Portsmouth
Other active civil engineering contractors registered in Portsmouth.
- Jdconstructionportsmouth Limited2013
- JDW Groundworks Southern Ltd2026
- Kew Diving Services Ltd2020
- L M D Utilities Ltd2025
- L&C Traffic Management Ltd2022
- L.D.Utilities Limited2020
- M & R Rail Ltd2014
- Manchip Construction Limited2005
All civil engineering contractors in Portsmouth · All trades in Portsmouth · Civil engineering across the UK
Frequently asked questions
When are International Mechanical Services Ltd's accounts due?
International Mechanical Services Ltd's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is International Mechanical Services Ltd's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is International Mechanical Services Ltd still trading?
International 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 International Mechanical Services Ltd do?
International Mechanical Services Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is International Mechanical Services Ltd?
International Mechanical Services Ltd was incorporated on 29 June 2016, 10 years ago.
What is the penalty if International 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 International 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.