- Company number
- 11893132
- Incorporated
- 20 Mar 20197 years trading
- Registered office
- 142 Merton Road, Wimbledon, SW19 1EH
- Nature of business
- Construction of domestic buildings; Demolition; Plastering; Other building completion and finishing
30 Day Extensions Wandsworth Ltd is a 7-year-old private limited company registered in Wimbledon, company number 11893132, one of 24 building contractors in Wimbledon. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 £7,914 on the year before, to £8,014.
- Net assets rose in 1 of 5 year-on-year comparisons on record.
- Current assets of £73K against £65K owed within a year: 1.1 times cover.
- 2 employees on average, up from 0 the year before.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £8,014 | £73K | £65K | 2 | |
| 31 Mar 2024 | £100 | 0 | |||
| 31 Mar 2023 | £100 | 0 | |||
| 31 Mar 2022 | £100 | 0 | |||
| 31 Mar 2021 | £100 | 0 | |||
| 31 Mar 2020 | £100 | £0 | £0 | 0 |
Where 30 Day Extensions Wandsworth Ltd is registered
The registered office is in Wimbledon (SW19), in the Merton local authority area, London. Show SW19 1EH on a map.
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- Base Bloc LimitedBuilders
- Concealed Climate LimitedPlumbers and heating engineers
- Morningside LtdProperty developers
- Cupi-Building LtdBuilders
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- Aj & Co One LtdProperty developers
Also registered at this address
6 other companies use the same registered office as 30 Day Extensions Wandsworth Ltd.
- 30 Day Extensions Kingston LtdProperty developers
- 30 Day Extensions LimitedProperty developers
- 30 Day Extensions Wimbledon LtdProperty developers
- 6 Day Extensions LimitedBuilders
- Design30 Architecture LtdProperty developers
- House Extension Shop LtdBuilders
What happens if 30 Day Extensions Wandsworth 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 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
- 11893132
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 March 2019 (7 years ago)
- Registered office
- 142 Merton Road, Wimbledon, SW19 1EH
- Nature of business
- Construction of domestic buildings (SIC 41202)
Demolition (SIC 43110)
Plastering (SIC 43310)
Other building completion and finishing (SIC 43390) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 19 March 2026
- Previous names
- House Extension Wandsworth Limited (until 12 Jan 2024)
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.
Similar companies in Wimbledon
Other active building contractors registered in Wimbledon.
- Base Bloc Limited2026
- Chamberlain Projects Limited2014
- CPSL Construction Limited2010
- Hallmark Construction & Development Ltd2023
- House Extension Shop Ltd2018
- Inception Worldwide Limited2017
- Kodiak Construction Limited1989
- Lee Maintenance Ltd2025
All building contractors in Wimbledon · All trades in Wimbledon · Builders across the UK
Frequently asked questions
When are 30 Day Extensions Wandsworth Ltd's accounts due?
30 Day Extensions Wandsworth Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is 30 Day Extensions Wandsworth Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is 30 Day Extensions Wandsworth Ltd still trading?
30 Day Extensions Wandsworth 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 30 Day Extensions Wandsworth Ltd do?
30 Day Extensions Wandsworth Ltd is registered under Construction of domestic buildings (SIC 41202); Demolition (SIC 43110); Plastering (SIC 43310); Other building completion and finishing (SIC 43390).
How old is 30 Day Extensions Wandsworth Ltd?
30 Day Extensions Wandsworth Ltd was incorporated on 20 March 2019, 7 years ago.
What is the penalty if 30 Day Extensions Wandsworth 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 30 Day Extensions Wandsworth 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.