- Company number
- 12517677
- Incorporated
- 13 Mar 20206 years trading
- Registered office
- Unit 7A Highams Court, Layhams Road, Keston, BR2 6AR
- Nature of business
- Construction of commercial buildings; Construction of utility projects for electricity and telecommunications; Scaffold erection
J O'Sullivan Group Ltd is a 6-year-old private limited company registered in Keston, company number 12517677, one of 16 building contractors in Keston. 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 down £65K (-51.6%) on the year before, to £61K.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- 3 employees 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 Mar 2025 | £61K | £2,500 | £0 | 3 | |
| 31 Mar 2024 | £126K | £156K | £30K | 3 | |
| 31 Mar 2023 | £59K | £69K | £10K | 1 | |
| 31 Mar 2022 | £21K | £25K | 1 | ||
| 31 Mar 2021 | £3,688 | £4,547 | £859 | 1 |
Where J O'Sullivan Group Ltd is registered
The registered office is in Keston (BR2), in the Bromley local authority area, London. Show BR2 6AR on a map.
Other trade companies in BR2
- Paton Floors LtdBuilders
- Mechanically Connected LtdMotor traders
- Quality Traffic Management LtdMachinery repair and installation
- RJC Surveying LimitedProperty developers
- Ac Electrical E LtdElectricians
- Horizon One Building Services LtdBuilders
- Bermont Homes LimitedProperty developers
- Castle Lion Property Services LtdFacilities management
What happens if J O'Sullivan Group 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
- 12517677
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 March 2020 (6 years ago)
- Registered office
- Unit 7A Highams Court, Layhams Road, Keston, BR2 6AR
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of utility projects for electricity and telecommunications (SIC 42220)
Scaffold erection (SIC 43991) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 18 February 2026
- Previous names
- O'Sullivan Civils Ltd (until 7 Oct 2020)
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 Keston
Other active building contractors registered in Keston.
- John Hughes Builders Ltd2002
- L-Squared Property & Maintenance Ltd2025
- My Office Clearance Ltd2020
- Rouse Developments Limited2007
- RSG FM & Building Services Ltd2022
- Sandbay Limited2010
- Stockman 360 Ltd2020
- Vinstrata Builders (London) Limited1983
All building contractors in Keston · All trades in Keston · Builders across the UK
Frequently asked questions
When are J O'Sullivan Group Ltd's accounts due?
J O'Sullivan Group 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 J O'Sullivan Group 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 J O'Sullivan Group Ltd still trading?
J O'Sullivan Group 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 J O'Sullivan Group Ltd do?
J O'Sullivan Group Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of utility projects for electricity and telecommunications (SIC 42220); Scaffold erection (SIC 43991).
How old is J O'Sullivan Group Ltd?
J O'Sullivan Group Ltd was incorporated on 13 March 2020, 6 years ago.
What is the penalty if J O'Sullivan Group 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 J O'Sullivan Group 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.