- Companies
- Builders
- Southampton
- CSF (Building Services) Limited
CSF (Building Services) Limited
- Company number
- 04227697
- Incorporated
- 4 Jun 200125 years trading
- Registered office
- 4 Sartoris Close, Warsash, Southampton, SO31 9EW
- Nature of business
- Construction of domestic buildings
CSF (Building Services) Limited is a 25-year-old private limited company registered in Southampton, company number 04227697, one of 491 building contractors in Southampton. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 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 £5,674 (-95.8%) on the year before, to £249.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £41K against £41K owed within a year: 1.0 times cover.
- 2 employees on average, up from 1 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 |
|---|---|---|---|---|---|
| 31 Oct 2025 | £249 | £41K | £41K | 2 | |
| 31 Oct 2024 | £5,923 | £60K | £66K | 1 | |
| 31 Oct 2023 | £1,114 | £53K | £54K | 2 | |
| 31 Oct 2022 | £18K | £52K | £69K | 2 | |
| 31 Aug 2021 | -£2,636 | £43K | £74K | £76K | 1 |
| 31 Aug 2020 | £15K | £40K | £40K | £25K | 1 |
| 31 Aug 2019 | £4,436 | £4,998 | £17K | £13K | 1 |
| 31 Aug 2018 | £7,142 | £5,072 | £30K | £23K | |
| 31 Aug 2017 | £4 | £12K | £12K | ||
| 31 Aug 2016 | £29K | £113K | £84K |
Where CSF (Building Services) Limited is registered
The registered office is in Southampton (SO31), in the Fareham local authority area, South East. Show SO31 9EW on a map.
Other trade companies in SO31
- MNC Cleaning LtdCleaning companies
- Mars Eng. LtdMachinery repair and installation
- Amc Plumbing and Heating LtdPlumbers and heating engineers
- Pride & Bloom LtdLandscapers and gardeners
- Hampshire Heating and Cooling LtdPlumbers and heating engineers
- Kelpie Landscape & Build LtdFinishing trades
- FSC Facilities Services LtdInstallers
- Fitton & Redding Services LimitedMechanics and garages
What happens if CSF (Building Services) 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 31 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 04227697
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 June 2001 (25 years ago)
- Registered office
- 4 Sartoris Close, Warsash, Southampton, SO31 9EW
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 4 June 2026
- Charges (mortgages)
- 2 outstanding of 2 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 in Southampton
Other active building contractors registered in Southampton.
- Cygna Homes Ltd2026
- Cykpyk Ltd2018
- D B Bricklaying Services Limited2020
- D Brown Brickwork Ltd2024
- D White Builders Limited2007
- D&N Tiling Ltd2015
- D-Dry Lining & Refurbishment Ltd2021
- Daco Refurbishment Plumbing and Heating Ltd2022
All building contractors in Southampton · All trades in Southampton · Builders across the UK
Frequently asked questions
When are CSF (Building Services) Limited's accounts due?
CSF (Building Services) Limited's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is CSF (Building Services) Limited's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is CSF (Building Services) Limited still trading?
CSF (Building Services) 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 CSF (Building Services) Limited do?
CSF (Building Services) Limited is registered under Construction of domestic buildings (SIC 41202).
How old is CSF (Building Services) Limited?
CSF (Building Services) Limited was incorporated on 4 June 2001, 25 years ago.
What is the penalty if CSF (Building Services) 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 CSF (Building Services) 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.