Cartref Builders Limited
- Company number
- 03650942
- Incorporated
- 16 Oct 199827 years trading
- Registered office
- 5 Snowdon View, Holyhead Road, Llanfairpwll, Anglesey, LL61 5SX
- Nature of business
- Construction of domestic buildings
Cartref Builders Limited is a 27-year-old private limited company registered in Llanfairpwll, company number 03650942, one of the UK's building contractors. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 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 Cartref Builders 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 up £11K (+97.3%) on the year before, to £23K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £43K against £20K owed within a year: 2.1 times cover.
- 2 employees on average during the year.
- 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 Aug 2025 | £23K | £11K | £43K | £20K | 2 |
| 31 Aug 2024 | £12K | £14K | £26K | £16K | 2 |
| 31 Aug 2023 | £13K | £12K | £34K | £22K | 2 |
| 31 Aug 2022 | £17K | £366 | £42K | £27K | 2 |
| 31 Aug 2021 | £29K | £15K | £58K | £31K | 3 |
| 31 Aug 2020 | £32K | £0 | £57K | £28K | 3 |
| 31 Aug 2019 | £19K | £8,906 | £36K | £19K | 2 |
| 31 Aug 2018 | £17K | £15K | £42K | £28K | 3 |
| 31 Aug 2017 | £15K | £3,993 | £36K | £24K | 3 |
| 31 Aug 2016 | £3,427 | £18K | £28K | £27K |
Who runs and owns Cartref Builders Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (3)
| Name | Role | Appointed |
|---|---|---|
| C*** O*** | Director | Oct 1998 |
| P*** O*** | Director | Oct 1998 |
| C*** O*** | Secretary | Oct 1998 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| Swift Incorporations Limited | Corporate Nominee Secretary | Oct 1998 | Oct 1998 |
People with significant control (2)
Where Cartref Builders Limited is registered
The registered office is in Llanfairpwll (LL61), in the Isle of Anglesey local authority area, Wales. Show LL61 5SX on a map.
Other trade companies in LL61
- Greenworld-Engineering LtdPlumbers and heating engineers
- Saarathi Services LtdCleaning companies
- Gwynedd Auto Electrics LtdMechanics and garages
- Anglesey Heritage Construction LimitedBuilders
- PG Garage LtdMechanics and garages
- Powerline Operations LtdCivil engineering
- Andrew Swainston Services LimitedCivil engineering
- Tonki Ventures LtdProperty developers
What happens if Cartref Builders 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 03650942
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 October 1998 (27 years ago)
- Registered office
- 5 Snowdon View, Holyhead Road, Llanfairpwll, Anglesey, LL61 5SX
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 16 October 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
Other active building contractors.
Frequently asked questions
When are Cartref Builders Limited's accounts due?
Cartref Builders Limited's next accounts are due at Companies House by 31 May 2027 (in 231 days), covering the period to 31 August 2026.
When is Cartref Builders Limited's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is Cartref Builders Limited still trading?
Cartref Builders 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 Cartref Builders Limited do?
Cartref Builders Limited is registered under Construction of domestic buildings (SIC 41202).
How old is Cartref Builders Limited?
Cartref Builders Limited was incorporated on 16 October 1998, 27 years ago.
Who runs Cartref Builders Limited?
Cartref Builders Limited has 2 active directors, the longest-serving appointed in Oct 1998. Their names and service addresses are on the Companies House register.
Who owns Cartref Builders Limited?
2 people or companies have significant control of Cartref Builders Limited: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if Cartref Builders 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 Cartref Builders 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.