- Companies
- Specialist contractors
- Londonderry
- Mahon 7 Construction Ltd
Mahon 7 Construction Ltd
- Company number
- NI661288
- Incorporated
- 10 May 20197 years trading
- Registered office
- 80 Bracken Park, Londonderry, BT48 8AZ
- Nature of business
- Other specialised construction activities n.e.c.
Mahon 7 Construction Ltd is a 7-year-old private limited company registered in Londonderry, company number NI661288, one of 48 specialist construction companies in Londonderry. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 Mahon 7 Construction LtdOr 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 up £3,318 (+620.2%) on the year before, to £3,853.
- Net assets rose in 2 of 5 year-on-year comparisons on record.
- Current assets of £14K against £12K owed within a year: 1.2 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £3,853 | £14K | £12K | 1 | |
| 31 May 2024 | £535 | £10K | £14K | 1 | |
| 31 May 2023 | £2,280 | £5,204 | £5,668 | 1 | |
| 31 May 2022 | £1,024 | £14K | £16K | 1 | |
| 31 May 2021 | £1,297 | £14K | £12K | 1 | |
| 31 May 2020 | £14K | £162 | £2,790 | 1 |
Where Mahon 7 Construction Ltd is registered
The registered office is in Londonderry (BT48), in the Derry City and Strabane local authority area, Northern Ireland. Show BT48 8AZ on a map.
Other trade companies in BT48
- Neat & Nurtured Vics Cleaning LimitedCleaning companies
- Ked Brick & Blockwork LtdBuilders
- Zapcars LtdMotor traders
- TMC Electrics LtdElectricians
- Northern Diesels LtdMotor traders
- Coyle Reclamation & Salvage LtdSpecialist contractors
- George MCG Mechanical LtdElectricians
- KK Electrical Solutions Ireland LimitedElectricians
What happens if Mahon 7 Construction 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- NI661288
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 May 2019 (7 years ago)
- Registered office
- 80 Bracken Park, Londonderry, BT48 8AZ
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 9 May 2026
- Previous names
- Leak-Find-Fix-Repair Ltd (until 12 Jun 2020)
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Londonderry
Other active specialist construction companies registered in Londonderry.
- Malcon Homes Ltd2011
- Martin Brown Construction Limited2007
- MC Cormick Brothers Ltd2025
- MD Consulting NW Ltd2022
- North Coast Damp Proofing Limited2026
- NPB Partitions Ltd2018
- O K Cranes & Formwork Limited2005
- O'Neill Proweld Limited2015
All specialist construction companies in Londonderry · All trades in Londonderry · Specialist contractors across the UK
Frequently asked questions
When are Mahon 7 Construction Ltd's accounts due?
Mahon 7 Construction Ltd's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is Mahon 7 Construction Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Mahon 7 Construction Ltd still trading?
Mahon 7 Construction 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 7 Construction Ltd do?
Mahon 7 Construction Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Mahon 7 Construction Ltd?
Mahon 7 Construction Ltd was incorporated on 10 May 2019, 7 years ago.
What is the penalty if Mahon 7 Construction 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 7 Construction 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.