- Company number
- 06975750
- Incorporated
- 29 Jul 200917 years trading
- Registered office
- Belfry House, Bell Lane, Hertford, Hertfordshire, SG14 1BP
- Nature of business
- Construction of domestic buildings
Rock Plastics Ltd is a 17-year-old private limited company registered in Hertford, company number 06975750, one of 60 building contractors in Hertford. 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 £8,922 (+13.4%) on the year before, to £76K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £225K against £166K owed within a year: 1.4 times cover.
- 5 employees on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2026 | £76K | £44K | £225K | £166K | 5 |
| 31 Jan 2025 | £67K | £272K | £249K | 5 | |
| 31 Jan 2024 | £83K | £206K | £174K | 5 | |
| 31 Jan 2023 | £77K | £280K | £259K | 5 | |
| 31 Jan 2022 | £66K | £249K | £224K | 5 | |
| 31 Jan 2021 | -£1,637 | £149K | £182K | 5 | |
| 31 Jan 2020 | -£1,567 | £74K | £93K | 5 | |
| 31 Jan 2019 | £49K | £112K | £59K | ||
| 31 Jan 2018 | £25K | £70K | £56K | ||
| 31 Jan 2017 | £21K | £43K | £36K |
Where Rock Plastics Ltd is registered
The registered office is in Hertford (SG14), in the East Hertfordshire local authority area, East of England. Show SG14 1BP on a map.
Other trade companies in SG14
- Bespoke Performance Training LimitedMotor traders
- Ak Collectibles LimitedMotor traders
- Hoe Lane LimitedProperty developers
- Meads Plumbing & Heating LimitedPlumbers and heating engineers
- SRP Plumbing Services LtdPlumbers and heating engineers
- Worster and Son LimitedFinishing trades
- Recovery and Garage Services LimitedMechanics and garages
- The Village Home & Garden Company LtdFinishing trades
Shared registered office
158 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 Rock Plastics 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 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
- 06975750
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 July 2009 (17 years ago)
- Registered office
- Belfry House, Bell Lane, Hertford, Hertfordshire, SG14 1BP
- 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
- 22 March 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 Hertford
Other active building contractors registered in Hertford.
- Set 2 Build Group Ltd2024
- Simpson and West Construction Ltd2026
- SMC Refurbishments Limited2004
- Summit Construction (Herts) Ltd2025
- TJB Site Engineers Ltd2015
- Tolmers Construction Limited2005
- Topsec Limited2025
- V & S Scaffolding (Hertford) Ltd2009
All building contractors in Hertford · All trades in Hertford · Builders across the UK
Frequently asked questions
When are Rock Plastics Ltd's accounts due?
Rock Plastics Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is Rock Plastics Ltd'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 Rock Plastics Ltd still trading?
Rock Plastics 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 Rock Plastics Ltd do?
Rock Plastics Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Rock Plastics Ltd?
Rock Plastics Ltd was incorporated on 29 July 2009, 17 years ago.
What is the penalty if Rock Plastics 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 Rock Plastics 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.