O'Sullivan Construction Limited
- Company number
- 02085240
- Incorporated
- 18 Dec 198639 years trading
- Registered office
- 231 Long Elmes, Harrow Weald, Middx, HA3 6LE
- Nature of business
- Construction of domestic buildings
O'Sullivan Construction Limited is a 39-year-old private limited company registered in Middx, company number 02085240, one of the UK's building contractors. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 30 December 2026 is due at HMRC on 30 December 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for O'Sullivan Construction LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £19K (-6.2%) on the year before, to £283K.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £243K against £17K owed within a year: more than 10 times cover.
- 1 employee on average, down from 2 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Dec 2025 | £283K | £243K | £17K | 1 | |
| 30 Dec 2024 | £301K | £250K | £7,897 | 2 | |
| 30 Dec 2023 | £314K | £261K | £8,173 | 2 | |
| 30 Dec 2022 | £339K | £376K | £87K | 4 | |
| 30 Dec 2021 | £343K | £449K | £155K | 4 | |
| 30 Dec 2020 | £320K | £383K | £121K | 3 | |
| 30 Dec 2019 | £280K | £305K | £87K | 3 | |
| 30 Dec 2018 | £300K | £252K | £23K | ||
| 30 Dec 2017 | £287K | £357K | £139K | ||
| 30 Dec 2016 | £298K | £371K | £146K |
Where O'Sullivan Construction Limited is registered
The registered office is in Middx (HA3), in the Harrow local authority area, London. Show HA3 6LE on a map.
Other trade companies in HA3
- M&M Team Solutions LimitedCleaning companies
- Asr234 LimitedCivil engineering
- Shine Bright With NV LtdMechanics and garages
- Direct Sparks LtdMachinery repair and installation
- Meral Decoration & Maintenance LtdPainters and decorators
- Add22 LtdCivil engineering
- Floyd Cleaners LimitedCleaning companies
- Amalia&Ioana LimitedBuilders
What happens if O'Sullivan Construction 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 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 31 Dec 2027 | £200 |
| 3 months late | 30 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Dec 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
- 02085240
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 December 1986 (39 years ago)
- Registered office
- 231 Long Elmes, Harrow Weald, Middx, HA3 6LE
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 December 2025
- Last confirmation statement
- 21 December 2025
- Charges (mortgages)
- 1 outstanding of 1 registered
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
Other active building contractors.
Frequently asked questions
When are O'Sullivan Construction Limited's accounts due?
O'Sullivan Construction Limited's next accounts are due at Companies House by 30 September 2027 (in 353 days), covering the period to 30 December 2026.
When is O'Sullivan Construction Limited's CT600 due?
The CT600 for the period to 30 December 2026 is due at HMRC by 30 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is O'Sullivan Construction Limited still trading?
O'Sullivan Construction 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 O'Sullivan Construction Limited do?
O'Sullivan Construction Limited is registered under Construction of domestic buildings (SIC 41202).
How old is O'Sullivan Construction Limited?
O'Sullivan Construction Limited was incorporated on 18 December 1986, 39 years ago.
What is the penalty if O'Sullivan Construction 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 O'Sullivan Construction 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.