- Company number
- 05090087
- Incorporated
- 31 Mar 200422 years trading
- Registered office
- 86 Eglinton Hill, Shooters Hill, London, SE18 3DY
- Nature of business
- Construction of commercial buildings
Mahon Brickwork Ltd is a 22-year-old private limited company registered in London, company number 05090087, one of 12,075 building contractors 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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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 £52K (+7.3%) on the year before, to £767K.
- Net assets rose in 7 of 7 year-on-year comparisons on record.
- Current assets of £754K against £120K owed within a year: 6.3 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £767K | £750K | £754K | £120K | 0 |
| 31 Mar 2024 | £715K | £676K | £682K | £103K | 4 |
| 31 Mar 2023 | £674K | £447K | £643K | £109K | 3 |
| 31 Mar 2022 | £567K | £505K | £532K | £107K | 3 |
| 31 Mar 2021 | £456K | £369K | £373K | £65K | 3 |
| 31 Mar 2020 | £377K | £287K | £302K | £63K | 4 |
| 31 Mar 2019 | £320K | £231K | £244K | £66K | 4 |
| 31 Mar 2018 | £254K | £165K | £178K | £55K | 3 |
Where Mahon Brickwork Ltd is registered
The registered office is in London (SE18), in the Greenwich local authority area, London. Show SE18 3DY on a map.
Other trade companies in SE18
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- Hma Building Services LimitedFinishing trades
- JWJ Road Services LtdCleaning companies
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- Flynn Afghanistan Construction LtdBuilders
- Cleo Clean LtdCleaning companies
- Lutah Electrical LtdElectricians
What happens if Mahon Brickwork Ltd 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
- 05090087
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 31 March 2004 (22 years ago)
- Registered office
- 86 Eglinton Hill, Shooters Hill, London, SE18 3DY
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 24 March 2026
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 London
Other active building contractors registered in London.
- Mahoneyltd Ltd2026
- Mahu Services Limited2025
- Mai Build Ltd2024
- Maia Construction Limited2016
- Maiden Construction Ltd2022
- Mainlink Limited2009
- Maintain and Build Ltd2025
- Maintained Limited2019
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Mahon Brickwork Ltd's accounts due?
Mahon Brickwork Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Mahon Brickwork Ltd'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 Mahon Brickwork Ltd still trading?
Mahon Brickwork Ltd 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 Mahon Brickwork Ltd do?
Mahon Brickwork Ltd is registered under Construction of commercial buildings (SIC 41201).
How old is Mahon Brickwork Ltd?
Mahon Brickwork Ltd was incorporated on 31 March 2004, 22 years ago.
What is the penalty if Mahon Brickwork Ltd 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 Mahon Brickwork Ltd 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.