- Companies
- Plumbers and heating engineers
- Darlington
- Blackwell Heating Ltd
Blackwell Heating Ltd
- Company number
- 06197728
- Incorporated
- 2 Apr 200719 years trading
- Registered office
- 29 High Northgate, Darlington, County Durham, DL1 1UQ
- Nature of business
- Plumbing, heat and air-conditioning installation
Blackwell Heating Ltd is a 19-year-old private limited company registered in Darlington, company number 06197728, one of 58 plumbing and heating companies in Darlington. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £4,092 (-6.1%) on the year before, to £63K.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £360K against £345K owed within a year: 1.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 May 2025 | £63K | £102K | £360K | £345K | 0 |
| 31 May 2024 | £67K | £114K | £283K | £309K | 17 |
| 31 May 2023 | £81K | £219K | £300K | £276K | 16 |
| 31 May 2022 | £162K | £227K | £380K | £249K | 17 |
| 31 May 2021 | £213K | £482K | £275K | 8 | |
| 31 May 2020 | £130K | £264K | £102K | 10 | |
| 31 May 2019 | £140K | £232K | |||
| 31 May 2018 | £116K | £243K | £180K | ||
| 31 May 2017 | £89K | £192K | £132K | ||
| 31 May 2016 | £52K | £53K | £121K | £101K |
Where Blackwell Heating Ltd is registered
The registered office is in Darlington (DL1), in the Darlington local authority area, North East. Show DL1 1UQ 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 Blackwell 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 06197728
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 2 April 2007 (19 years ago)
- Registered office
- 29 High Northgate, Darlington, County Durham, DL1 1UQ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 2 May 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
- Previous names
- Blackwell Heating & Plumbing Ltd (until 21 Jul 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.
- C&P Waters Property Services Limited2015
- C. Suttie Plumbing & Heating Services Limited2017
- Closecooper Ltd2020
- Closecooper Renewables Ltd2025
- Darlington Gas Limited2023
- Delta C Design Limited2005
- Eacuk Ltd2026
- Eliteheat & Gas Ltd2025
All plumbing and heating companies in Darlington · All trades in Darlington · Plumbers and heating engineers across the UK
Frequently asked questions
When are Blackwell Heating Ltd's accounts due?
Blackwell Heating Ltd's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is Blackwell Heating Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Blackwell Heating Ltd still trading?
Blackwell 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 Blackwell Heating Ltd do?
Blackwell Heating Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Blackwell Heating Ltd?
Blackwell Heating Ltd was incorporated on 2 April 2007, 19 years ago.
What is the penalty if Blackwell 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 Blackwell 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.