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- Mason Construction Limited
Company profile · Installers
Mason Construction Limited
Mason Construction Limited is a 10-year-old private limited company registered in London, company number 10032852, one of 2,278 installation companies (insulation, lifts, shutters and similar) in London. 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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Financial snapshot, 2025
From the balance sheet at 31 March 2025, as filed at Companies House.
Mason Construction Limited over the years
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 £4,059 (+13%) on the year before, to £35K.
- Net assets rose in 8 of 8 year-on-year comparisons on record.
- Current assets of £33K against £4,644 owed within a year: 7.0 times cover.
- 2 employees on average during the year.
- 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 |
|---|---|---|---|---|---|
| 31 Mar 2025 | £35K | £32K | £33K | £4,644 | 2 |
| 31 Mar 2024 | £31K | £25K | £25K | £3,840 | 2 |
| 31 Mar 2023 | £27K | £19K | £19K | £2,596 | 2 |
| 31 Mar 2022 | £24K | £10K | £11K | £2,333 | 2 |
| 31 Mar 2021 | £23K | £12K | £12K | £2,022 | 2 |
| 31 Mar 2020 | £22K | £14K | £14K | £1,707 | 0 |
| 31 Mar 2019 | £16K | £9,037 | £9,136 | £1,620 | |
| 31 Mar 2018 | £14K | £12 | £6,152 | £1,664 | |
| 31 Mar 2017 | £13K | £119 | £4,439 | £4,957 |
Where Mason Construction Limited is registered
The registered office is in London (W1B), in the Westminster local authority area, London. Show W1B 3HH on a map.
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- Smith's Rural Builds LtdBuilders
Shared registered office
53 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Mason Construction 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
- 10032852
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 February 2016 (10 years ago)
- Registered office
- 3RD Floor, 207 Regent Street, London, W1B 3HH
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 28 February 2026
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in London
Other active installation companies (insulation, lifts, shutters and similar) registered in London.
- Matei Construct Ltd2026
- Matriarchy Maintenance Ltd2026
- Matriix Limited2019
- Matt O'Leary Carpentry & General Building Ltd2022
- Matthew Baron Construction Limited2003
- Max Build Limited2024
- Max Creations Limited2024
- Maximum Services (Ua) Ltd.2012
All installation companies (insulation, lifts, shutters and similar) in London · All trades in London · Installers across the UK
Frequently asked questions
When are Mason Construction Limited's accounts due?
Mason Construction Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Mason Construction 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 Mason Construction Limited still trading?
Mason Construction 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 Mason Construction Limited do?
Mason Construction Limited is registered under Other construction installation (SIC 43290).
How old is Mason Construction Limited?
Mason Construction Limited was incorporated on 29 February 2016, 10 years ago.
What is the penalty if Mason Construction 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 Mason Construction 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.