- Companies
- Civil engineering
- London
- Mainline Civil Engineering Ltd
Mainline Civil Engineering Ltd
- Company number
- 14779391
- Incorporated
- 4 Apr 20233 years trading
- Registered office
- 3RD Floor City Reach, 5 Greenwich View Place, London, E14 9NN
- Nature of business
- Construction of roads and motorways
Mainline Civil Engineering Ltd is a 3-year-old private limited company registered in London, company number 14779391, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 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 Mainline Civil Engineering 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 £62K (+96.3%) on the year before, to £126K.
- Current assets of £174K against £219K owed within a year: 0.8 times cover.
- 1 employee on average, down from 2 the year before.
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £126K | £43K | £174K | £219K | 1 |
| 30 Apr 2024 | £64K | £39K | £70K | £9,420 | 2 |
Where Mainline Civil Engineering Ltd is registered
The registered office is in London (E14), in the Tower Hamlets local authority area, London. Show E14 9NN on a map.
Other trade companies in E14
- Clarke & Lloyds Technologies LtdSpecialist contractors
- London Dev Grays LimitedProperty developers
- London Dev Sittingbourne LimitedProperty developers
- London Dev Dagenham LimitedProperty developers
- JK Motor Vehicles LtdMotor traders
- Eilunio LtdProperty developers
- Gasi Cleaning Co LtdCleaning companies
- Lustrouk LimitedCleaning companies
Also registered at this address
16 other companies use the same registered office as Mainline Civil Engineering Ltd.
- Aar Global Motors LimitedMotor traders
- Apollo Construction & Roofing LtdBuilders
- Apollo Construction South East LtdBuilders
- BDP Joinery LtdSpecialist contractors
- Buckinghamshire Import Specialists LtdMotor traders
- H and H Construction (London) LtdFinishing trades
- HJ Building & Construction LtdProperty developers
- HJ Building Developments LimitedProperty developers
- Kalbo Imports LtdMotor traders
- Macavis Construction and Development LimitedBuilders
- North London Gardens LimitedLandscapers and gardeners
- Peridot Si LtdGroundworks and demolition
- Prestige UK Automotive LtdMotor traders
- Reactive Maintenance (London) LtdFinishing trades
- Robinson Construction (Cheshunt) LimitedBuilders
- Top Line Roofing & Property Maintenance LtdRoofers
What happens if Mainline Civil Engineering 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 14779391
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 April 2023 (3 years ago)
- Registered office
- 3RD Floor City Reach, 5 Greenwich View Place, London, E14 9NN
- Nature of business
- Construction of roads and motorways (SIC 42110)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 3 April 2026
- Charges (mortgages)
- 0 outstanding of 1 registered
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- Mainline Utility Group Ltd2025
- Maior Ltd2022
- Maison Consulting Services Ltd.2008
- Majeed Construction Ltd.2002
- Majesty Group Ltd.2015
- Makdu Services Limited2024
- Makmuz Ltd2019
- Makuso Engineering Ltd2020
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Mainline Civil Engineering Ltd's accounts due?
Mainline Civil Engineering Ltd's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is Mainline Civil Engineering Ltd's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Mainline Civil Engineering Ltd still trading?
Mainline Civil Engineering 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 Mainline Civil Engineering Ltd do?
Mainline Civil Engineering Ltd is registered under Construction of roads and motorways (SIC 42110).
How old is Mainline Civil Engineering Ltd?
Mainline Civil Engineering Ltd was incorporated on 4 April 2023, 3 years ago.
What is the penalty if Mainline Civil Engineering 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 Mainline Civil Engineering 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.