- Companies
- Specialist contractors
- London
- Mainway Construction Ltd
Mainway Construction Ltd
- Company number
- 16743565
- Incorporated
- 25 Sep 20251 year trading
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Other specialised construction activities n.e.c.
Mainway Construction Ltd is a 1-year-old private limited company registered in London, company number 16743565, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 25 June 2027, and its first CT600 is due at HMRC on 24 September 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Mainway Construction Ltd is registered
The registered office is in London (N1), in the Hackney local authority area, London. Show N1 7GU on a map.
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- Kenneth Brady LtdElectricians
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- Magic Door Services LimitedMachinery repair and installation
Shared registered office
1,583 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 Mainway 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 25 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 26 Jun 2027 to 25 Jul 2027 | £150 |
| 1 to 3 months late | 26 Jul 2027 to 25 Sep 2027 | £375 |
| 3 to 6 months late | 26 Sep 2027 to 25 Dec 2027 | £750 |
| More than 6 months late | From 26 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 16743565
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 September 2025 (1 year ago)
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 22 September 2026
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 London
Other active specialist construction companies registered in London.
- Maj Trade Ltd2016
- Majani Construction Ltd2026
- Majet Developments Ltd2022
- Malcom House Ltd2008
- Maldon 2 Limited2023
- Maloney Decorators Ltd2017
- Maluhia Construction Ltd2026
- Mama Jones Industries Limited2026
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Mainway Construction Ltd's accounts due?
Mainway Construction Ltd's next accounts are due at Companies House by 25 June 2027 (in 256 days), covering the period to 30 September 2026.
When is Mainway Construction Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 24 September 2026, due by 24 September 2027, and one for the period to 30 September 2026, due by 30 September 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Mainway Construction Ltd still trading?
Mainway 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 Mainway Construction Ltd do?
Mainway Construction Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Mainway Construction Ltd?
Mainway Construction Ltd was incorporated on 25 September 2025, 1 year ago.
What is the penalty if Mainway 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 Mainway 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.