- Company number
- 10640132
- Incorporated
- 27 Feb 20179 years trading
- Registered office
- 86 South Norwood Hill, London, SE25 6AQ
- Nature of business
- Construction of domestic buildings
J23 Builders Limited is a 9-year-old private limited company registered in London, company number 10640132, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £1,640 (-92.8%) on the year before, to £128.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £1,762 against £8,044 owed within a year: 0.2 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 10 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £128 | £1,762 | £8,044 | 1 | |
| 29 Feb 2024 | £1,768 | £14K | £21K | 1 | |
| 28 Feb 2023 | £38K | £56K | £27K | 1 | |
| 28 Feb 2022 | £35K | £74K | £52K | 1 | |
| 28 Feb 2021 | £147 | £16K | £18K | 1 | |
| 29 Feb 2020 | £26K | £92K | £69K | 1 | |
| 28 Feb 2020 | £26K | £92K | £69K | 1 | |
| 28 Feb 2019 | £3,547 | £39K | £40K | ||
| 27 Feb 2019 | £3,547 | £39K | £40K | 1 | |
| 28 Feb 2018 | £5,555 | £12K | £12K |
Where J23 Builders Limited is registered
The registered office is in London (SE25), in the Croydon local authority area, London. Show SE25 6AQ on a map.
Other trade companies in SE25
- Luna Plumbing LtdPlumbers and heating engineers
- Mendivra LtdJoiners and carpenters
- Squeaky Mastery Services LtdCleaning companies
- MM(P)M LtdProperty developers
- Meysam Electrical LtdElectricians
- Madej Property Maintenance LtdFinishing trades
- Leonardo Bespoke Joinery LtdJoiners and carpenters
- GCS Electrical Services LimitedElectricians
Shared registered office
60 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if J23 Builders 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 10640132
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 February 2017 (9 years ago)
- Registered office
- 86 South Norwood Hill, London, SE25 6AQ
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 26 February 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 London
Other active building contractors registered in London.
- J3 Pointing & Restoration Ltd2025
- Ja Construction Works Ltd2025
- Jaa7 Limited2020
- Jabal Alsafwa for Contracting and General Maintenance Ltd2026
- Jabbarson Construction Ltd2019
- Jabko Limited2023
- Jac Renovations Ltd2024
- Jacek the Builder Ltd2024
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are J23 Builders Limited's accounts due?
J23 Builders Limited's next accounts are due at Companies House by 30 November 2026 (in 49 days), covering the period to 28 February 2026.
When is J23 Builders Limited's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is J23 Builders Limited still trading?
J23 Builders 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 J23 Builders Limited do?
J23 Builders Limited is registered under Construction of domestic buildings (SIC 41202).
How old is J23 Builders Limited?
J23 Builders Limited was incorporated on 27 February 2017, 9 years ago.
What is the penalty if J23 Builders 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 J23 Builders 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.