- Company number
- 12775951
- Incorporated
- 29 Jul 20206 years trading
- Registered office
- 36-38 Old Devonshire Road, Balham, London, SW12 9RB
- Nature of business
- Construction of domestic buildings; Other construction installation; Other building completion and finishing
Extensions London Limited is a 6-year-old private limited company registered in London, company number 12775951, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 31 July 2026 is due at HMRC on 31 July 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 £45K (+40.2%) on the year before, to £155K.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £267K against £112K owed within a year: 2.4 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 |
|---|---|---|---|---|---|
| 31 Jul 2025 | £155K | £267K | £112K | 1 | |
| 31 Jul 2024 | £111K | £231K | £118K | 1 | |
| 31 Jul 2023 | £95K | £232K | £136K | 1 | |
| 31 Jul 2022 | £137K | £211K | £73K | 1 | |
| 31 Jul 2021 | £70K | £95K | £24K | 1 |
Where Extensions London Limited is registered
The registered office is in London (SW12), in the Wandsworth local authority area, London. Show SW12 9RB on a map.
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Also registered at this address
3 other companies use the same registered office as Extensions London Limited.
- Lofts London LimitedInstallers
- SLL Contractors LimitedBuilders
- South London Lofts LimitedProperty developers
What happens if Extensions London 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 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 12775951
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 July 2020 (6 years ago)
- Registered office
- 36-38 Old Devonshire Road, Balham, London, SW12 9RB
- Nature of business
- Construction of domestic buildings (SIC 41202)
Other construction installation (SIC 43290)
Other building completion and finishing (SIC 43390) - Year end
- 31 July (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 28 July 2026
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
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Other active building contractors registered in London.
- Extra Staffing Solutions Ltd2023
- Extrasteel Import Ltd2022
- Extreme Cribs Ltd2012
- Extreme Workout Gymnasium Ltd2024
- Eye of the Contractor Limited2019
- Eyelevel Design 168 Ltd2026
- Eyg Empire Limited2023
- Eyot Construction Limited2025
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Frequently asked questions
When are Extensions London Limited's accounts due?
Extensions London Limited's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 31 July 2026.
When is Extensions London Limited's CT600 due?
The CT600 for the period to 31 July 2026 is due at HMRC by 31 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is Extensions London Limited still trading?
Extensions London 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 Extensions London Limited do?
Extensions London Limited is registered under Construction of domestic buildings (SIC 41202); Other construction installation (SIC 43290); Other building completion and finishing (SIC 43390).
How old is Extensions London Limited?
Extensions London Limited was incorporated on 29 July 2020, 6 years ago.
What is the penalty if Extensions London 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 Extensions London 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.