- Company number
- 13357670
- Incorporated
- 26 Apr 20215 years trading
- Registered office
- C/O Delta House Limited, Phoenix Business Centre, Rosslyn Crescent, Harrow, Middlesex, HA1 2SP
- Nature of business
- Roofing activities
Mainline Roofing Limited is a 5-year-old private limited company registered in Harrow, company number 13357670, one of 46 roofing companies in Harrow. Its next accounts are due at Companies House on 29 January 2027, and the CT600 for the period to 29 April 2026 is due at HMRC on 29 April 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 £2,510 (+12.9%) on the year before, to £22K.
- Net assets rose in 2 of 3 year-on-year comparisons on record.
- Current assets of £2,770 against £27K owed within a year: 0.1 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 4 years, 2022 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 29 Apr 2025 | £22K | £2,770 | £27K | 1 | |
| 29 Apr 2024 | £19K | £2,681 | £20K | 1 | |
| 30 Apr 2023 | £728 | £23K | £16K | 1 | |
| 30 Apr 2022 | £4,667 | £14K | £3,995 | 1 |
Where Mainline Roofing Limited is registered
The registered office is in Harrow (HA1), in the Harrow local authority area, London. Show HA1 2SP on a map.
Other trade companies in HA1
- Cabos Electrical LimitedElectricians
- Mia Maria Services LtdCleaning companies
- Ac Operations LtdScaffolders
- Verde Masters LtdLandscapers and gardeners
- Omega Works Group LtdLandscapers and gardeners
- Call 'Em LimitedPlumbers and heating engineers
- Swan Roofing Services LimitedRoofers
- DRV Property Solutions LtdPainters and decorators
Shared registered office
71 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 Mainline Roofing 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 29 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Jan 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 29 Apr 2027 | £375 |
| 3 to 6 months late | 30 Apr 2027 to 29 Jul 2027 | £750 |
| More than 6 months late | From 30 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Apr 2027 | £200 |
| 3 months late | 29 Jul 2027 | another £200 |
| 6 months late | 29 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 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
- 13357670
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 April 2021 (5 years ago)
- Registered office
- C/O Delta House Limited, Phoenix Business Centre, Rosslyn Crescent, Harrow, Middlesex, HA1 2SP
- Nature of business
- Roofing activities (SIC 43910)
- Year end
- 29 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 29 April 2025
- Last confirmation statement
- 25 April 2026
Filing notes for roofing companies
Roofing companies commonly work under CIS and run vans and access equipment, so CIS deductions and capital allowances are the two things to get right.
Similar companies in Harrow
Other active roofing companies registered in Harrow.
- Master Home Improvements Ltd2026
- Master Roof Solutions Ltd2020
- MGS Roofing Ltd2022
- Monarchy Roofing Limited2025
- Nanu Roofing Ltd2023
- Normandy Roofing Services Limited2023
- P.W.R.( Roofing) Limited2021
- Prestige Roofing and Building Limited2025
All roofing companies in Harrow · All trades in Harrow · Roofers across the UK
Frequently asked questions
When are Mainline Roofing Limited's accounts due?
Mainline Roofing Limited's next accounts are due at Companies House by 29 January 2027 (in 109 days), covering the period to 29 April 2026.
When is Mainline Roofing Limited's CT600 due?
The CT600 for the period to 29 April 2026 is due at HMRC by 29 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 30 January 2027.
Is Mainline Roofing Limited still trading?
Mainline Roofing 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 Mainline Roofing Limited do?
Mainline Roofing Limited is registered under Roofing activities (SIC 43910).
How old is Mainline Roofing Limited?
Mainline Roofing Limited was incorporated on 26 April 2021, 5 years ago.
What is the penalty if Mainline Roofing 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 Mainline Roofing 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.