- Companies
- Plumbers and heating engineers
- Darlington
- Northern Mech Limited
Northern Mech Limited
- Company number
- 15151276
- Incorporated
- 20 Sep 20233 years trading
- Registered office
- 21 Beech Rise, Darlington, County Durham, DL1 3TQ
- Nature of business
- Plumbing, heat and air-conditioning installation
Northern Mech Limited is a 3-year-old private limited company registered in Darlington, company number 15151276, one of 58 plumbing and heating companies in Darlington. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £17K (-33.5%) on the year before, to £33K.
- Current assets of £44K against £23K owed within a year: 1.9 times cover.
- 1 employee on average during the year.
- 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 Sep 2025 | £33K | £44K | £23K | 1 | |
| 30 Sep 2024 | £50K | £79K | £37K | 1 |
Where Northern Mech Limited is registered
The registered office is in Darlington (DL1), in the Darlington local authority area, North East. Show DL1 3TQ on a map.
Other trade companies in DL1
- Darlo Car Wash LtdMechanics and garages
- Home by Aym LtdProperty developers
- Simply Gleaming LtdCleaning companies
- Sinead the Cleaning Lady LtdCleaning companies
- BB Optichrome LimitedCleaning companies
- JB Car & Commercials LtdMotor traders
- Egtc LtdLandscapers and gardeners
- LSS Contractors Ne LtdCivil engineering
What happens if Northern Mech 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £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
- 15151276
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 September 2023 (3 years ago)
- Registered office
- 21 Beech Rise, Darlington, County Durham, DL1 3TQ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 31 August 2026
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 Darlington
Other active plumbing and heating companies registered in Darlington.
- Northstar Heating Ltd2023
- Nunnery Plumbing and Heating Ltd2021
- On Tap Heating Services Limited2009
- P C Plumbing and Gas Ltd2023
- P New Gas Services Ltd2022
- Poppy’S Tubing Ltd2025
- Proheat Engineering Limited2021
- RPG Rootie's Plumbing & Gas Ltd2026
All plumbing and heating companies in Darlington · All trades in Darlington · Plumbers and heating engineers across the UK
Frequently asked questions
When are Northern Mech Limited's accounts due?
Northern Mech Limited's next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is Northern Mech Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Northern Mech Limited still trading?
Northern Mech 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 Northern Mech Limited do?
Northern Mech Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Northern Mech Limited?
Northern Mech Limited was incorporated on 20 September 2023, 3 years ago.
What is the penalty if Northern Mech 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 Northern Mech 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.