- Company number
- 08619837
- Incorporated
- 22 Jul 201313 years trading
- Registered office
- 242-246 Oxford Street, Swansea, SA1 3BL
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Helix 21 Limited is a 13-year-old private limited company registered in Swansea, company number 08619837, one of 204 building contractors in Swansea. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 £168K (-72.8%) on the year before, to £63K.
- Net assets rose in 2 of 9 year-on-year comparisons on record.
- Current assets of £1.3M against £1.3M owed within a year: 1.0 times cover.
- 7 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 |
|---|---|---|---|---|---|
| 30 Jun 2025 | £63K | £35K | £1.3M | £1.3M | 7 |
| 30 Jun 2024 | £231K | £180K | £1.6M | £1.4M | 7 |
| 30 Jun 2023 | £370K | £19K | £1.2M | £853K | 4 |
| 30 Jun 2022 | £394K | £5,149 | £805K | £391K | 3 |
| 30 Jun 2021 | £396K | £3,871 | £586K | £151K | 0 |
| 30 Jun 2020 | £409K | £6,846 | £465K | £6,050 | 0 |
| 30 Jun 2019 | £425K | £41K | £428K | £2,483 | |
| 30 Jun 2018 | £430K | £108K | £616K | £186K | |
| 30 Jun 2017 | £430K | £123K | £586K | £157K | |
| 30 Jun 2016 | £429K | £191K | £457K | £28K |
Who runs and owns Helix 21 Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| C*** D*** | Director | Jul 2013 |
| S*** D*** | Director | Jul 2013 |
People with significant control (2)
Charges (secured borrowing)
1 of 1 registered charge is outstanding. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| Finance Wales Investments (11) Limited | Outstanding | Aug 2015 |
Where Helix 21 Limited is registered
The registered office is in Swansea (SA1), in the Swansea local authority area, Wales. Show SA1 3BL on a map.
Other trade companies in SA1
- JDS Ringside Customs LtdRepair services
- D & M Carpentry and Construction LimitedCivil engineering
- Westway Window Systems LimitedJoiners and carpenters
- International Classic Car Sales LtdMotor traders
- Edefec LtdBuilders
- Swansea Scaffolding Services LtdScaffolders
- Lou's Paint and Finish LimitedPainters and decorators
- Mesa Property Development LtdProperty developers
Also registered at this address
2 other companies use the same registered office as Helix 21 Limited.
- Biophilic Life LimitedProperty developers
- Hacer Developments LimitedProperty developers
What happens if Helix 21 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 08619837
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 July 2013 (13 years ago)
- Registered office
- 242-246 Oxford Street, Swansea, SA1 3BL
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 30 June (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 22 July 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
- Previous names
- CM Davies Construction Ltd (until 28 Sep 2020)
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 Swansea
Other active building contractors registered in Swansea.
- Hendrefoilan Development Ltd2020
- Hengoed Davies Limited2007
- Homes on Gower Limited2020
- Idh Construction Ltd2026
- J Carpentry Ltd2023
- J Lynch Building Limited2020
- J&F Elements Ltd.2017
- J&R Carpentry & Building Ltd2020
All building contractors in Swansea · All trades in Swansea · Builders across the UK
Frequently asked questions
When are Helix 21 Limited's accounts due?
Helix 21 Limited's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is Helix 21 Limited's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Helix 21 Limited still trading?
Helix 21 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 Helix 21 Limited do?
Helix 21 Limited is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Helix 21 Limited?
Helix 21 Limited was incorporated on 22 July 2013, 13 years ago.
Who runs Helix 21 Limited?
Helix 21 Limited has 2 active directors, the longest-serving appointed in Jul 2013. Their names and service addresses are on the Companies House register.
Who owns Helix 21 Limited?
2 people or companies have significant control of Helix 21 Limited: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if Helix 21 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 Helix 21 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.