- Company number
- 12911928
- Incorporated
- 29 Sep 20206 years trading
- Registered office
- 35 High Street, Margate, CT9 1DX
- Nature of business
- Construction of domestic buildings
A O'Connor Building Services Ltd is a 6-year-old private limited company registered in Margate, company number 12911928, one of 69 building contractors in Margate. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £5 (+500%) on the year before, to £6.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £61K against £102K owed within a year: 0.6 times cover.
- 2 employees on average, up from 0 the year before.
- 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 |
|---|---|---|---|---|---|
| 30 Sep 2025 | £6 | £61K | £102K | 2 | |
| 30 Sep 2024 | £1 | £33K | £76K | 0 | |
| 30 Sep 2023 | £1 | £33K | £76K | 2 | |
| 30 Sep 2022 | £3,055 | £48K | £50K | 1 | |
| 30 Sep 2021 | £11K | £52K | £51K | 1 |
Where A O'Connor Building Services Ltd is registered
The registered office is in Margate (CT9), in the Thanet local authority area, South East. Show CT9 1DX on a map.
Other trade companies in CT9
- KMH Property Group LtdProperty developers
- JR Electrical Services (Kent) LtdMachinery repair and installation
- CSL Ground Solutions LtdInstallers
- Pej Court Developments LtdBuilders
- Alro Interior Building LtdFinishing trades
- Tune Up Garage LtdMechanics and garages
- KM Group LtdProperty developers
- S.Groundworks LtdCivil engineering
Shared registered office
36 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 A O'Connor Building Services 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 12911928
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 September 2020 (6 years ago)
- Registered office
- 35 High Street, Margate, CT9 1DX
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 28 September 2025
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 Margate
Other active building contractors registered in Margate.
- A. Carter Developments Limited2025
- Aedifi Industrial Ltd.2022
- Aj Plumbing and Property Development Ltd2024
- Ajr Design and Build (Kent) Ltd2020
- Apex Timber Construction Ltd2025
- Bennett's Construction Kent Limited2025
- Blissett Construction Ltd2025
- Broaden & Build Ltd2026
All building contractors in Margate · All trades in Margate · Builders across the UK
Frequently asked questions
When are A O'Connor Building Services Ltd's accounts due?
A O'Connor Building Services Ltd's next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is A O'Connor Building Services Ltd's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is A O'Connor Building Services Ltd still trading?
A O'Connor Building Services 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 A O'Connor Building Services Ltd do?
A O'Connor Building Services Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is A O'Connor Building Services Ltd?
A O'Connor Building Services Ltd was incorporated on 29 September 2020, 6 years ago.
What is the penalty if A O'Connor Building Services 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 A O'Connor Building Services 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.