- Companies
- Machinery repair and installation
- Durham Filtration Limited
Durham Filtration Limited
- Company number
- 05738867
- Incorporated
- 10 Mar 200620 years trading
- Registered office
- 3 Coldbath Square, London, EC1R 5HL
- Nature of business
- Installation of industrial machinery and equipment; Engineering design activities for industrial process and production; Engineering related scientific and technical consulting activities; Technical testing and analysis
Durham Filtration Limited is a 20-year-old private limited company, company number 05738867, one of the UK's machinery repair and installation companies. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
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 £5,506 (-5.1%) on the year before, to £103K.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £689K against £651K owed within a year: 1.1 times cover.
- 11 employees on average, up from 10 the year before.
- Balance sheets on record for 10 years, 2015 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £103K | £88K | £689K | £651K | 11 |
| 31 Dec 2023 | £109K | £24K | £664K | £595K | 10 |
| 31 Dec 2022 | £94K | £116K | £1.2M | £1.1M | 10 |
| 31 Dec 2021 | -£16K | £70K | £730K | £707K | 8 |
| 31 Dec 2020 | £37K | £183K | £589K | £528K | 10 |
| 31 Dec 2019 | £141K | £31K | £705K | £587K | 11 |
| 31 Dec 2018 | £139K | £43K | £966K | £855K | |
| 31 Dec 2017 | £32K | £42K | £1.1M | £1.1M | |
| 31 Dec 2016 | £492K | £31K | £1.2M | £797K | |
| 31 Dec 2015 | £564K | £28K | £1.6M | £1.1M |
Where Durham Filtration Limited is registered
The registered office is in the EC1R postcode district, in the Islington local authority area, London. Show EC1R 5HL on a map.
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Also registered at this address
20 other companies use the same registered office as Durham Filtration Limited.
- 48-49 North Street Taunton Developments LimitedProperty developers
- Base Contracts LimitedFinishing trades
- Bradsett LimitedProperty developers
- Chiltern of Bovingdon LimitedMotor traders
- Diesco Investments LimitedProperty developers
- Eve Investments LimitedProperty developers
- Fine View Windows LimitedInstallers
- Franpol Properties LimitedProperty developers
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- Holbond LimitedProperty developers
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What happens if Durham Filtration 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 05738867
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 March 2006 (20 years ago)
- Registered office
- 3 Coldbath Square, London, EC1R 5HL
- Nature of business
- Installation of industrial machinery and equipment (SIC 33200)
Engineering design activities for industrial process and production (SIC 71121)
Engineering related scientific and technical consulting activities (SIC 71122)
Technical testing and analysis (SIC 71200) - Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 10 March 2026
- Charges (mortgages)
- 2 outstanding of 3 registered
- Previous names
- Gentleaid (9) Limited (until 25 Feb 2008)
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies
Other active machinery repair and installation companies.
Frequently asked questions
When are Durham Filtration Limited's accounts due?
Durham Filtration Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Durham Filtration Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 December 2025, due by 31 December 2026, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Durham Filtration Limited still trading?
Durham Filtration 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 Durham Filtration Limited do?
Durham Filtration Limited is registered under Installation of industrial machinery and equipment (SIC 33200); Engineering design activities for industrial process and production (SIC 71121); Engineering related scientific and technical consulting activities (SIC 71122); Technical testing and analysis (SIC 71200).
How old is Durham Filtration Limited?
Durham Filtration Limited was incorporated on 10 March 2006, 20 years ago.
What is the penalty if Durham Filtration 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 Durham Filtration 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.