- Companies
- Cleaning companies
- London
- Diamond Base Limited
Diamond Base Limited
- Company number
- 15175530
- Incorporated
- 29 Sep 20233 years trading
- Registered office
- 107 Winchelsea Road, London, N17 6XL
- Nature of business
- General cleaning of buildings; Other human health activities
Diamond Base Limited is a 3-year-old private limited company registered in London, company number 15175530, one of 5,627 cleaning companies in London. 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 up £99 on the year before, to £100.
- 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 | £100 | £0 | £0 | 1 | |
| 30 Sep 2024 | £1 | 1 |
Where Diamond Base Limited is registered
The registered office is in London (N17), in the Haringey local authority area, London. Show N17 6XL on a map.
Other trade companies in N17
- JKL Building & Maintenance LtdFinishing trades
- Vas-Vent LtdSpecialist contractors
- Zbrsons LtdMotor traders
- Bally 33 LtdBuilders
- Abcd Cleaning LtdCleaning companies
- Mie Cleaning Solutions LtdCleaning companies
- Worklane LtdRoofers
- Figzu LtdCleaning companies
Also registered at this address
1 other company uses the same registered office as Diamond Base Limited.
- Joyibo Imagination Enterprises LtdSpecialist contractors
What happens if Diamond Base 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
- 15175530
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 September 2023 (3 years ago)
- Registered office
- 107 Winchelsea Road, London, N17 6XL
- Nature of business
- General cleaning of buildings (SIC 81210)
Other human health activities (SIC 86900) - Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 1 May 2026
Filing notes for cleaning companies
Cleaning companies are often staff-heavy, so wages, pension contributions and the employment allowance all show up in the accounts.
Similar companies in London
Other active cleaning companies registered in London.
- Diamond D Cleaning Ltd2023
- Diamond Deep Clean Limited2023
- Diamond Edge Cleaning Solutions Ltd2024
- Diamond Elite Housekeeping Ltd2026
- Diamond Housekeeper Ltd2024
- Diamond M Ltd2023
- Diamond Purity Limited2017
- Diamond Shine Car Detailing Ltd2026
All cleaning companies in London · All trades in London · Cleaning companies across the UK
Frequently asked questions
When are Diamond Base Limited's accounts due?
Diamond Base Limited's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is Diamond Base 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 Diamond Base Limited still trading?
Diamond Base 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 Diamond Base Limited do?
Diamond Base Limited is registered under General cleaning of buildings (SIC 81210); Other human health activities (SIC 86900).
How old is Diamond Base Limited?
Diamond Base Limited was incorporated on 29 September 2023, 3 years ago.
What is the penalty if Diamond Base 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 Diamond Base 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.