- Companies
- Builders
- Carshalton
- Prosto Construction London Ltd
Prosto Construction London Ltd
- Company number
- 15106129
- Incorporated
- 30 Aug 20233 years trading
- Registered office
- 20 Wrythe Lane, Carshalton, SM5 2RN
- Nature of business
- Construction of domestic buildings
Prosto Construction London Ltd is a 3-year-old private limited company registered in Carshalton, company number 15106129, one of 104 building contractors in Carshalton. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 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 £71K (-394.9%) on the year before, to -£53K.
- Current assets of £52K against £114K owed within a year: 0.5 times cover.
- 2 employees 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 |
|---|---|---|---|---|---|
| 31 Aug 2025 | -£53K | £18K | £52K | £114K | 2 |
| 31 Aug 2024 | £18K | £50K | £37K | 2 |
Who runs and owns Prosto Construction London Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| M*** S*** | Director | Aug 2023 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| M*** S*** | Director | Aug 2023 | May 2026 |
People with significant control (2)
Where Prosto Construction London Ltd is registered
The registered office is in Carshalton (SM5), in the Sutton local authority area, London. Show SM5 2RN on a map.
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Also registered at this address
1 other company uses the same registered office as Prosto Construction London Ltd.
- Solidcore London LtdBuilders
What happens if Prosto Construction London 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 15106129
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 August 2023 (3 years ago)
- Registered office
- 20 Wrythe Lane, Carshalton, SM5 2RN
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 29 August 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.
Similar companies in Carshalton
Other active building contractors registered in Carshalton.
- Quality Kiwi Carpentry Ltd2023
- Quality Painting & Decorating Services Ltd2017
- Refurbly Home Improvements Ltd2009
- Solidcore London Ltd2026
- Stovi Plumbing Ltd2014
- Stratus Building and Mechanical Services Ltd2021
- Surrey London Builds Ltd2025
- TB Quality Painting & Decorating Services Ltd2019
All building contractors in Carshalton · All trades in Carshalton · Builders across the UK
Frequently asked questions
When are Prosto Construction London Ltd's accounts due?
Prosto Construction London Ltd's next accounts are due at Companies House by 31 May 2027 (in 229 days), covering the period to 31 August 2026.
When is Prosto Construction London Ltd's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is Prosto Construction London Ltd still trading?
Prosto Construction London 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 Prosto Construction London Ltd do?
Prosto Construction London Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Prosto Construction London Ltd?
Prosto Construction London Ltd was incorporated on 30 August 2023, 3 years ago.
Who runs Prosto Construction London Ltd?
Prosto Construction London Ltd has 1 active director, the longest-serving appointed in Aug 2023. Their names and service addresses are on the Companies House register.
Who owns Prosto Construction London Ltd?
2 people or companies have significant control of Prosto Construction London Ltd: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if Prosto Construction London 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 Prosto Construction London 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.