- Companies
- Plumbers and heating engineers
- Portsmouth
- Pure Mechanical (Southern) Limited
Pure Mechanical (Southern) Limited
- Company number
- 11839289
- Incorporated
- 21 Feb 20197 years trading
- Registered office
- 3 Acorn Business Centre Northarbour Road, Cosham, Portsmouth, Hampshire, PO6 3TH
- Nature of business
- Plumbing, heat and air-conditioning installation
Pure Mechanical (Southern) Limited is a 7-year-old private limited company registered in Portsmouth, company number 11839289, one of 141 plumbing and heating companies in Portsmouth. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 £30K (-36.8%) on the year before, to £51K.
- Net assets rose in 3 of 6 year-on-year comparisons on record.
- Current assets of £132K against £87K owed within a year: 1.5 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Nov 2025 | £51K | £54K | £132K | £87K | 0 |
| 30 Nov 2024 | £81K | £93K | £201K | £125K | 3 |
| 30 Nov 2023 | £72K | £79K | £149K | £77K | 3 |
| 30 Nov 2022 | £22K | £27K | £93K | £72K | 5 |
| 30 Nov 2021 | £189 | £0 | £39K | £41K | 5 |
| 30 Nov 2020 | £498 | £21K | £55K | £56K | 5 |
| 30 Nov 2019 | £6,407 | £17K | £34K | £30K |
Where Pure Mechanical (Southern) Limited is registered
The registered office is in Portsmouth (PO6), in the Portsmouth local authority area, South East. Show PO6 3TH 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
Also registered at this address
18 other companies use the same registered office as Pure Mechanical (Southern) Limited.
- Arb Mechanical Engineering LimitedPlumbers and heating engineers
- Arlo Building and Landscapes LtdLandscapers and gardeners
- BSL Scaffolding Services LimitedScaffolders
- C C S S LimitedScaffolders
- Coity Estates LimitedProperty developers
- Fire Fix Solutions LtdElectricians
- Firefix LtdElectricians
- Gold Scaffolding Services LtdScaffolders
- Hi Developments South LimitedProperty developers
- I.M.E Group LimitedMachinery repair and installation
- I.M.E Repair Services LimitedMachinery repair and installation
- JTMP Moling and Water Supply Services LimitedFinishing trades
- PGS Installations Solent LimitedPlumbers and heating engineers
- Phoenix Builders LtdProperty developers
- Pure Construction (Southern) LimitedBuilders
- Rob Leary Construction LimitedBuilders
- S&S Roofing & Building LimitedRoofers
- SP Scaffolding Erectors LimitedScaffolders
What happens if Pure Mechanical (Southern) 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 11839289
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 February 2019 (7 years ago)
- Registered office
- 3 Acorn Business Centre Northarbour Road, Cosham, Portsmouth, Hampshire, PO6 3TH
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 20 January 2026
- Previous names
- Pure Plumbing and Heating (Southern) Limited (until 12 May 2023)
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 Portsmouth
Other active plumbing and heating companies registered in Portsmouth.
- Quality Gas (Portsmouth) Ltd2018
- R&S Mechanical Ltd2021
- Rafbar Plumbing & Heating Limited2017
- RB Gas and Heating Services Ltd2021
- Robert O Leary Plumbing & Heating Ltd2018
- RVM Heating Ltd2023
- S&H Pipework Ltd2024
- S.R.Gas Ltd2008
All plumbing and heating companies in Portsmouth · All trades in Portsmouth · Plumbers and heating engineers across the UK
Frequently asked questions
When are Pure Mechanical (Southern) Limited's accounts due?
Pure Mechanical (Southern) Limited's next accounts are due at Companies House by 31 August 2027 (in 322 days), covering the period to 30 November 2026.
When is Pure Mechanical (Southern) Limited's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is Pure Mechanical (Southern) Limited still trading?
Pure Mechanical (Southern) 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 Pure Mechanical (Southern) Limited do?
Pure Mechanical (Southern) Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Pure Mechanical (Southern) Limited?
Pure Mechanical (Southern) Limited was incorporated on 21 February 2019, 7 years ago.
What is the penalty if Pure Mechanical (Southern) 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 Pure Mechanical (Southern) 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.