- Company number
- 05964618
- Incorporated
- 12 Oct 200620 years trading
- Registered office
- c/o Riddingtons Ltd, The Old Barn Off Wood Street, Swanley Village, Swanley, Kent, BR8 7PA
- Nature of business
- Construction of domestic buildings
Mainline Contractors (Eltham) Limited is a 20-year-old private limited company registered in Swanley, company number 05964618, one of 42 building contractors in Swanley. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 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 down £30K (-58.3%) on the year before, to £22K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £12K against £7,756 owed within a year: 1.5 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2025 | £22K | £12K | £12K | £7,756 | 1 |
| 31 Oct 2024 | £52K | £45K | £45K | £14K | 1 |
| 31 Oct 2023 | £28K | £16K | £18K | £14K | 1 |
| 31 Oct 2022 | £21K | £23K | £10K | 1 | |
| 31 Oct 2021 | £8,221 | £13K | £14K | 1 | |
| 31 Oct 2020 | £19K | £19K | £19K | £8,112 | 1 |
| 31 Oct 2019 | £14K | £9,661 | £17K | £12K | 1 |
| 31 Oct 2018 | £15K | £4,909 | £6,689 | £4,111 | 1 |
| 31 Oct 2017 | £6,896 | £8,222 | £8,222 | £5,284 | 1 |
| 31 Oct 2016 | £134 | £18K | £19K | £24K |
Where Mainline Contractors (Eltham) Limited is registered
The registered office is in Swanley (BR8), in the Sevenoaks local authority area, South East. Show BR8 7PA on a map.
Other trade companies in BR8
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- Epx Resins LtdFloor and wall tilers
- SLC Contractors Ltd LtdBuilders
- Build and Beyond CX Consulting LimitedFinishing trades
- Roostanproperty LtdProperty developers
- HL Contract Cleaning Services LtdMechanics and garages
- Fasteasycar LtdMotor traders
Shared registered office
50 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 Contractors (Eltham) 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 31 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 05964618
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 October 2006 (20 years ago)
- Registered office
- c/o Riddingtons Ltd, The Old Barn Off Wood Street, Swanley Village, Swanley, Kent, BR8 7PA
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 6 November 2025
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 Swanley
Other active building contractors registered in Swanley.
- Mariglass Ltd2015
- Mas Construction Ltd2022
- Mind Mechanical Services Group Limited2021
- Pde Solutions Ltd2023
- Portfolio Homes Grassy Lane Limited2021
- PRB Estates Limited2000
- R Communications Ltd2025
- Raf Plumbing Heating and Property Services Limited2025
All building contractors in Swanley · All trades in Swanley · Builders across the UK
Frequently asked questions
When are Mainline Contractors (Eltham) Limited's accounts due?
Mainline Contractors (Eltham) Limited's next accounts are due at Companies House by 31 July 2027 (in 291 days), covering the period to 31 October 2026.
When is Mainline Contractors (Eltham) Limited's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Mainline Contractors (Eltham) Limited still trading?
Mainline Contractors (Eltham) 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 Contractors (Eltham) Limited do?
Mainline Contractors (Eltham) Limited is registered under Construction of domestic buildings (SIC 41202).
How old is Mainline Contractors (Eltham) Limited?
Mainline Contractors (Eltham) Limited was incorporated on 12 October 2006, 20 years ago.
What is the penalty if Mainline Contractors (Eltham) 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 Contractors (Eltham) 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.