- Companies
- Plumbers and heating engineers
- Derby
- Mainline Plumbing & Heating Ltd
Mainline Plumbing & Heating Ltd
- Company number
- 12650952
- Incorporated
- 8 Jun 20206 years trading
- Registered office
- 27 Rowsley Avenue, Derby, DE23 6JZ
- Nature of business
- Plumbing, heat and air-conditioning installation
Mainline Plumbing & Heating Ltd is a 6-year-old private limited company registered in Derby, company number 12650952, one of 176 plumbing and heating companies in Derby. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 £977 (-1%) on the year before, to £95K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £119K against £37K owed within a year: 3.2 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £95K | £119K | £37K | 1 | |
| 30 Jun 2024 | £96K | £137K | £60K | 1 | |
| 30 Jun 2023 | £182K | £173K | £16K | 1 | |
| 30 Jun 2022 | £112K | £164K | £52K | 1 | |
| 30 Jun 2021 | £57K | £79K | £22K | 1 |
Where Mainline Plumbing & Heating Ltd is registered
The registered office is in Derby (DE23), in the Derby local authority area, East Midlands. Show DE23 6JZ on a map.
Other trade companies in DE23
- Bart Fix and Finish LtdInstallers
- BDF Construction LtdBuilders
- Aichi Autos LtdMotor traders
- MNK Group LtdMotor traders
- Rising Star Trading Derby LimitedMotor traders
- Tap Stop Civils & Plumbing LimitedPlumbers and heating engineers
- German Salvage & Repairs LtdMechanics and garages
- RDX Design LimitedBuilders
Also registered at this address
1 other company uses the same registered office as Mainline Plumbing & Heating Ltd.
- H.S.C Property Services LtdFinishing trades
What happens if Mainline Plumbing & Heating 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 12650952
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 June 2020 (6 years ago)
- Registered office
- 27 Rowsley Avenue, Derby, DE23 6JZ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 29 November 2025
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Derby
Other active plumbing and heating companies registered in Derby.
- Matte Interiors Limited2017
- MB Heating and Plumbing Limited2023
- MB Reactive Maintenance Limited2026
- Mda Plumbing Limited2018
- Melbourne Plumbing & Bathrooms Limited2014
- Mercury Plumbing & Heating Limited2008
- MGS Plumbing & Gas Ltd2019
- Midland Plumbing & Gas Ltd2026
All plumbing and heating companies in Derby · All trades in Derby · Plumbers and heating engineers across the UK
Frequently asked questions
When are Mainline Plumbing & Heating Ltd's accounts due?
Mainline Plumbing & Heating Ltd's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is Mainline Plumbing & Heating Ltd's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Mainline Plumbing & Heating Ltd still trading?
Mainline Plumbing & Heating 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 Plumbing & Heating Ltd do?
Mainline Plumbing & Heating Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Mainline Plumbing & Heating Ltd?
Mainline Plumbing & Heating Ltd was incorporated on 8 June 2020, 6 years ago.
What is the penalty if Mainline Plumbing & Heating 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 Plumbing & Heating 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.