- Company number
- 10346753
- Incorporated
- 25 Aug 201610 years trading
- Registered office
- 37 Willoughby Close, Bristol, BS13 7NL
- Nature of business
- Construction of domestic buildings
CSW Extensions Limited is a 10-year-old private limited company registered in Bristol, company number 10346753, one of 809 building contractors in Bristol. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 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 £64 (+12.9%) on the year before, to £561.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £36K against £35K owed within a year: 1.0 times cover.
- 2 employees on average, down from 6 the year before.
- Balance sheets on record for 10 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £561 | £36K | £35K | 2 | |
| 31 Jan 2024 | £497 | £48K | £44K | 6 | |
| 31 Jan 2023 | £766 | £60K | £54K | 9 | |
| 31 Jan 2022 | £407 | £68K | £60K | 9 | |
| 31 Jan 2021 | £516 | £41K | £30K | 5 | |
| 31 Jan 2020 | £505 | £27K | £30K | 4 | |
| 31 Jan 2019 | £8,651 | £43K | £38K | ||
| 30 Jan 2019 | £8,651 | £43K | £38K | 3 | |
| 31 Jan 2018 | £2,134 | £27K | £30K | ||
| 31 Jan 2017 | £3,257 | £7,694 | £5,937 |
Where CSW Extensions Limited is registered
The registered office is in Bristol (BS13), in the Bristol, City of local authority area, South West. Show BS13 7NL on a map.
Other trade companies in BS13
- Guardian Lifting Group LtdSpecialist contractors
- Elyn Property LtdPainters and decorators
- Auto Jeitinho LtdMechanics and garages
- Southwest Scaffolding Bristol LtdScaffolders
- Southern Group SW LtdBuilders
- Bristol Master Cleaners LtdCleaning companies
- BSW Roofing & Building LtdRoofers
- M&C Scaffolding LtdScaffolders
Also registered at this address
1 other company uses the same registered office as CSW Extensions Limited.
- CSW Loft Conversions LimitedJoiners and carpenters
What happens if CSW Extensions 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 10346753
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 August 2016 (10 years ago)
- Registered office
- 37 Willoughby Close, Bristol, BS13 7NL
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 24 August 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 Bristol
Other active building contractors registered in Bristol.
- Culmbridge Ltd2015
- Curtis PM Ltd2018
- CWG Design and Build Limited2007
- D C Projects and Property Management Company Limited2020
- D N B Services Limited2026
- D R Bond Properties Limited2017
- D R L Developments Limited2003
- D. Stobbs Building Developments Ltd2017
All building contractors in Bristol · All trades in Bristol · Builders across the UK
Frequently asked questions
When are CSW Extensions Limited's accounts due?
CSW Extensions Limited's next accounts are due at Companies House by 31 October 2026 (in 19 days), covering the period to 31 January 2026.
When is CSW Extensions Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is CSW Extensions Limited still trading?
CSW Extensions 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 CSW Extensions Limited do?
CSW Extensions Limited is registered under Construction of domestic buildings (SIC 41202).
How old is CSW Extensions Limited?
CSW Extensions Limited was incorporated on 25 August 2016, 10 years ago.
What is the penalty if CSW Extensions 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 CSW Extensions 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.