- Companies
- Plumbers and heating engineers
- Portsmouth
- Arb Mechanical Engineering Limited
Arb Mechanical Engineering Limited
- Company number
- 06425216
- Incorporated
- 13 Nov 200718 years trading
- Registered office
- 3 Acorn Business Centre Northarbour Road, Cosham, Portsmouth, Hampshire, PO6 3TH
- Nature of business
- Plumbing, heat and air-conditioning installation
Arb Mechanical Engineering Limited is a 18-year-old private limited company registered in Portsmouth, company number 06425216, one of 141 plumbing and heating companies in Portsmouth. Its next accounts are due at Companies House on 5 January 2027, and its first CT600 is due at HMRC on 31 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Arb Mechanical Engineering LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £71K (-8%) on the year before, to £816K.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £2.9M against £2.1M owed within a year: 1.3 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £816K | £1.5M | £2.9M | £2.1M | 0 |
| 31 Mar 2024 | £887K | £2.5M | £3.8M | £3M | 28 |
| 31 Mar 2023 | £1.6M | £14M | £16M | £15M | 29 |
| 31 Mar 2022 | £1.2M | £1.4M | £2.4M | £1.3M | 33 |
| 31 Mar 2021 | £1.4M | £2.8M | £4.2M | £2.8M | 35 |
Public contracts won
Arb Mechanical Engineering Limited has 18 public sector contract awards on record; the ones with their own published value total £3.2M, from 2017 to 2026. Source: Contracts Finder and Find a Tender award notices. For 3 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. 12 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Hampshire County Council8 awards
- National Oceanography Centre3 awards
- NHS Property Services Limited2 awards
- NHS Property Services Limited2 awards
- University Hospitals Dorset NHS Foundation Trust1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| National Oceanography Centre | Chilled Water Main Chillers Replacement | £627K | 25 Feb 2026 |
| Hampshire County Council | MWF Lot 6 Crestwood Community School (Cherbourg) - Heating Enabling Works - AWARD | £24K | 18 Nov 2025 |
| NHS Property Services Limited | Wokingham Hospital – Windsor Ward Drainage upgrades | £68K | 20 Sep 2025 |
| Hampshire County Council | MWF - Lot 6 - Winchester Law Courts - Boiler And Controls Upgrades - AWARD | £400K | 4 Aug 2025 |
| NHS Property Services Limited | Refurbishing of boiler and AHU plant at Lewes Victoria Hospital | £252K | 14 Jul 2025 |
| National Oceanography Centre | Fume Extract Replacement Phase 4 | 10 Apr 2025 | |
| National Oceanography Centre | IT Suite Redundancy Cooling | £148K | 13 Mar 2025 |
| University Hospitals Dorset NHS Foundation Trust | Approved Contractors Framework List v2 (ACFL) | Ceiling, not shown | 25 Oct 2024 |
| Hampshire County Council | MWF - Lot 6 - Burnham Copse Primary School - Boiler Efficiency Upgrade and Replacement - AWARD | £145K | 24 May 2023 |
| University of Southampton | Montefiore Halls Calorifier & Boiler Replacements | £243K | 27 Apr 2023 |
Showing the 10 most recent of 18.
Where Arb Mechanical Engineering 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 Arb Mechanical Engineering Limited.
- 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
- Pure Mechanical (Southern) LimitedPlumbers and heating engineers
- Rob Leary Construction LimitedBuilders
- S&S Roofing & Building LimitedRoofers
- SP Scaffolding Erectors LimitedScaffolders
What happens if Arb Mechanical Engineering 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 5 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 6 Jan 2027 to 5 Feb 2027 | £150 |
| 1 to 3 months late | 6 Feb 2027 to 5 Apr 2027 | £375 |
| 3 to 6 months late | 6 Apr 2027 to 5 Jul 2027 | £750 |
| More than 6 months late | From 6 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 6 Apr 2027 | £200 |
| 3 months late | 5 Jul 2027 | another £200 |
| 6 months late | 5 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 5 Apr 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
- 06425216
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 November 2007 (18 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
- 5 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 6 December 2025
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.
- Arcadia Heating & Plumbing Services Limited2001
- Attwood Plumbing & Heating Limited2021
- B.Eastman Plumbing & Heating Limited2019
- Bale Plumbing & Heating Ltd2026
- Bayview Bathrooms Ltd2021
- Bissett & Robson Ltd2008
- Boiler Heat and Plumbing Ltd2023
- Bournemouth Prestige Bathrooms Ltd2024
All plumbing and heating companies in Portsmouth · All trades in Portsmouth · Plumbers and heating engineers across the UK
Frequently asked questions
When are Arb Mechanical Engineering Limited's accounts due?
Arb Mechanical Engineering Limited's next accounts are due at Companies House by 5 January 2027 (in 85 days), covering the period to 5 April 2026.
When is Arb Mechanical Engineering Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 March 2026, due by 31 March 2027, and one for the period to 5 April 2026, due by 5 April 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Arb Mechanical Engineering Limited still trading?
Arb Mechanical Engineering 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 Arb Mechanical Engineering Limited do?
Arb Mechanical Engineering Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Arb Mechanical Engineering Limited?
Arb Mechanical Engineering Limited was incorporated on 13 November 2007, 18 years ago.
Has Arb Mechanical Engineering Limited won public sector contracts?
Yes. Arb Mechanical Engineering Limited has 18 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £3.2M), most recently from National Oceanography Centre.
What is the penalty if Arb Mechanical Engineering 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 Arb Mechanical Engineering 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.