- Companies
- Finishing trades
- Plymouth
- Mercury Construction (South West) Limited
Mercury Construction (South West) Limited
- Company number
- 05912608
- Incorporated
- 22 Aug 200620 years trading
- Registered office
- Harscombe House 1 Darklake View, Estover, Plymouth, Devon, PL6 7TL
- Nature of business
- Other building completion and finishing
Mercury Construction (South West) Limited is a 20-year-old private limited company registered in Plymouth, company number 05912608, one of 101 building finishing companies in Plymouth. 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 £480K (-43.6%) on the year before, to £622K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £3.3M against £2.8M owed within a year: 1.2 times cover.
- 44 employees on average, down from 45 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Nov 2025 | £622K | £2M | £3.3M | £2.8M | 44 |
| 30 Nov 2024 | £1.1M | £1.6M | £3.1M | £2.1M | 45 |
| 30 Nov 2023 | £992K | £1.2M | £3M | £2.1M | 44 |
| 30 Nov 2022 | £1M | £1.2M | £3.3M | £2.4M | 42 |
| 30 Nov 2021 | £819K | £653K | £2.2M | £1.4M | 40 |
| 30 Nov 2020 | £661K | £1.4M | £2.3M | £1.7M | 39 |
| 30 Nov 2019 | £789K | £1.5M | £2.3M | £1.5M | 36 |
| 30 Nov 2018 | £467K | £1.4M | £3M | £2.6M | 33 |
| 30 Nov 2017 | £98K | £369K | £1.2M | £1.1M | 31 |
| 30 Nov 2016 | £99K | £397K | £1.3M | £1.2M |
Public contracts won
Mercury Construction (South West) Limited has 19 public sector contract awards on record; the ones with their own published value total £6.9M, from 2019 to 2026. Source: Contracts Finder and Find a Tender award notices. For 4 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. 11 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- University of Plymouth3 awards
- Devon County Council3 awards
- Exeter City Council3 awards
- Plymouth City Council2 awards
- Devon and Somerset Fire and Rescue Authority1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Devon and Somerset Fire and Rescue Authority | USAR/Station 45 Connection to Mains Drainage | £336K | 25 Aug 2026 |
| Plymouth Community Homes | Claremont Street Works | £2.6M | 17 Aug 2026 |
| Torbay Council | Mayfield College Relocation | £215K | 28 Oct 2025 |
| University of Plymouth | Roof Replacement at the John Bull Building | £654K | 19 Aug 2025 |
| The Crescent Academy | GEM (Good Estate Management) Framework | Ceiling, not shown | 18 Jul 2025 |
| Devon County Council | CP2549-24: Devon and Somerset Standing List of Approved Contractors (SLoAC) 2025 | Ceiling, not shown | 4 Apr 2025 |
| Exeter City Council | Refurbishment works PO22958 | £58K | 19 Mar 2025 |
| University of Plymouth | Estates Refurbishment | £98K | 7 Jan 2025 |
| Exeter City Council | Emergency Scaffolding - Corn Exchange | £79K | 31 Jul 2024 |
| Devon County Council | CP2455-23 Devon Maintenance Panel Agreement 2024-2028 | Ceiling, not shown | 3 Jun 2024 |
Showing the 10 most recent of 19.
Where Mercury Construction (South West) Limited is registered
The registered office is in Plymouth (PL6), in the Plymouth local authority area, South West. Show PL6 7TL on a map.
Other trade companies in PL6
- Transit Garage SW LimitedMechanics and garages
- Drilling Consultants LimitedCivil engineering
- A-Frame Scaffolding LimitedScaffolders
- SW Plantroom Partners LtdPlumbers and heating engineers
- Trueline (SW) LtdJoiners and carpenters
- Prime Plumbing & Heating SW LtdPlumbers and heating engineers
- New Cut Carpentry LimitedJoiners and carpenters
- Sos 360 LtdBuilders
Also registered at this address
15 other companies use the same registered office as Mercury Construction (South West) Limited.
- C D C Groundworks LtdCivil engineering
- Clutch Care Centre LimitedMechanics and garages
- Hyde Park Cars (Plymouth) LimitedMotor traders
- J Clifton Plumbing & Heating LimitedPlumbers and heating engineers
- M M Hamilton LimitedInstallers
- Matthew Kitchen Bodywork LtdMachinery repair and installation
- Modbox Developments LimitedBuilders
- Nelsons Cars LtdMotor traders
- O & S Plumbing and Heating LtdPlumbers and heating engineers
- Passive Fire Services LtdSpecialist contractors
- PW Building & Roofing LimitedFinishing trades
- R. & S. Motors LimitedMotor traders
- Wallsend Estates LimitedProperty developers
- Yealm Motor Services LimitedMechanics and garages
- Zeath @ the Bay LimitedBuilders
What happens if Mercury Construction (South West) 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
- 05912608
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 August 2006 (20 years ago)
- Registered office
- Harscombe House 1 Darklake View, Estover, Plymouth, Devon, PL6 7TL
- Nature of business
- Other building completion and finishing (SIC 43390)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 22 August 2026
- Charges (mortgages)
- 1 outstanding of 2 registered
Filing notes for building finishing companies
Finishing trade companies cover a wide range of work. Most are micro-entities with simple accounts and a straightforward CT600.
Similar companies in Plymouth
Other active building finishing companies registered in Plymouth.
- Michael Taylor (Plymouth) Ltd2004
- Neal Stoneman Holdings Limited2020
- Osterley Building Services Limited2010
- PL Building Services Limited2006
- Plymouth Building Solutions Ltd2025
- Plymouth Chimney and Flue Specialists Limited1997
- Plymouth Home Improvements Ltd2014
- Protect Maintenance SW Ltd2025
All building finishing companies in Plymouth · All trades in Plymouth · Finishing trades across the UK
Frequently asked questions
When are Mercury Construction (South West) Limited's accounts due?
Mercury Construction (South West) Limited's next accounts are due at Companies House by 31 August 2027 (in 323 days), covering the period to 30 November 2026.
When is Mercury Construction (South West) 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 Mercury Construction (South West) Limited still trading?
Mercury Construction (South West) 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 Mercury Construction (South West) Limited do?
Mercury Construction (South West) Limited is registered under Other building completion and finishing (SIC 43390).
How old is Mercury Construction (South West) Limited?
Mercury Construction (South West) Limited was incorporated on 22 August 2006, 20 years ago.
Has Mercury Construction (South West) Limited won public sector contracts?
Yes. Mercury Construction (South West) Limited has 19 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £6.9M), most recently from Devon and Somerset Fire and Rescue Authority.
What is the penalty if Mercury Construction (South West) 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 Mercury Construction (South West) 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.