- Company number
- 11395556
- Incorporated
- 4 Jun 20188 years trading
- Registered office
- Vivian House, Newham Road, Truro, Cornwall, TR1 2DP
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Mike Martin Window Systems Limited is a 8-year-old private limited company registered in Truro, company number 11395556, one of 94 building contractors in Truro. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 up £359K (+28.3%) on the year before, to £1.6M.
- Net assets rose in 6 of 6 year-on-year comparisons on record.
- Current assets of £2M against £510K owed within a year: 4.0 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 |
|---|---|---|---|---|---|
| 31 Mar 2025 | £1.6M | £577K | £2M | £510K | 0 |
| 31 Mar 2024 | £1.3M | £416K | £1.7M | £507K | 26 |
| 31 Mar 2023 | £1.3M | £669K | £1.5M | £505K | 21 |
| 31 Mar 2022 | £717K | £278K | £1M | £466K | 15 |
| 31 Mar 2021 | £463K | £329K | £742K | £363K | 12 |
| 31 Mar 2020 | £312K | £373K | £598K | £285K | 10 |
| 31 Mar 2019 | -£136K | -£346K | £238K |
Where Mike Martin Window Systems Limited is registered
The registered office is in Truro (TR1), in the Cornwall local authority area, South West. Show TR1 2DP on a map.
Other trade companies in TR1
- Wind Power Maintenance Services LtdMachinery repair and installation
- Treser Landscapes LimitedLandscapers and gardeners
- Alvan’S Painting Inc LtdPainters and decorators
- Acm Rail LtdCivil engineering
- Zest Developers SW LtdProperty developers
- Kernow Smart Repairs LtdMotor traders
- Millers Gardening & General Maintenance LtdLandscapers and gardeners
- JG Industries LtdFinishing trades
Also registered at this address
23 other companies use the same registered office as Mike Martin Window Systems Limited.
- Alvan’S Painting Inc LtdPainters and decorators
- C Pridmore Electrical Contractors LimitedElectricians
- D Harding Construction LimitedBuilders
- I4Detail Development LimitedBuilders
- Inter Solutions LtdSpecialist contractors
- J C Williams Cars and Commercials LtdMotor traders
- Jab Site Management LimitedSpecialist contractors
- Marine Lab LtdMachinery repair and installation
- N & C Property Developments (Truro) LimitedBuilders
- Napton Developments LimitedProperty developers
- North Coast Heating LtdPlumbers and heating engineers
- NSN Electrical LtdMachinery repair and installation
- Oxley Bros LimitedMechanics and garages
- Penbreage Design Services LtdGlaziers
- Pro-Line Window Company LimitedGlaziers
- Roseland Restoration LimitedCivil engineering
- Roseland Resurfacing LimitedSpecialist contractors
- Source Development (Cornwall) LimitedProperty developers
- Toliman Developments LtdProperty developers
- Trelawney Builders LimitedProperty developers
- Westberry Building Services LimitedBuilders
- Williams Creative Homes (Stencoose) LtdProperty developers
- Willow Construction (South West) LimitedFinishing trades
What happens if Mike Martin Window Systems 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 11395556
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 June 2018 (8 years ago)
- Registered office
- Vivian House, Newham Road, Truro, Cornwall, TR1 2DP
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 20 May 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Truro
Other active building contractors registered in Truro.
- Mint Construction South West Ltd2026
- MJJS Building Services Ltd2018
- Mylor Bridge Project Limited2020
- N & C Property Developments (Truro) Limited2025
- Oaktide Construction Ltd2026
- Onshorebuild Limited2025
- Opr Plumbing Ltd2025
- Osborn Property Renovations Ltd2022
All building contractors in Truro · All trades in Truro · Builders across the UK
Frequently asked questions
When are Mike Martin Window Systems Limited's accounts due?
Mike Martin Window Systems Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Mike Martin Window Systems Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Mike Martin Window Systems Limited still trading?
Mike Martin Window Systems 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 Mike Martin Window Systems Limited do?
Mike Martin Window Systems Limited is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Mike Martin Window Systems Limited?
Mike Martin Window Systems Limited was incorporated on 4 June 2018, 8 years ago.
What is the penalty if Mike Martin Window Systems 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 Mike Martin Window Systems 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.