- Companies
- Civil engineering
- Colchester
- Rock Core Ltd
Rock Core Ltd
- Company number
- 13709127
- Incorporated
- 28 Oct 20214 years trading
- Registered office
- Unit 6/7 Teybrook Centre Brook Road, Great Tey, Colchester, Essex, CO6 1JE
- Nature of business
- Construction of other civil engineering projects n.e.c.
Rock Core Ltd is a 4-year-old private limited company registered in Colchester, company number 13709127, one of 103 civil engineering contractors in Colchester. Its next accounts are due at Companies House on 24 October 2026, and its first CT600 is due at HMRC on 31 October 2026.
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 £174K (+45.6%) on the year before, to £554K.
- Current assets of £767K against £425K owed within a year: 1.8 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 3 years, 2022 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2024 | £554K | £971 | £767K | £425K | 3 |
| 31 Oct 2023 | £381K | £727K | £690K | 3 | |
| 31 Oct 2022 | £117K | £433K | £415K | 2 |
Where Rock Core Ltd is registered
The registered office is in Colchester (CO6), in the Colchester local authority area, East of England. Show CO6 1JE on a map.
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Also registered at this address
3 other companies use the same registered office as Rock Core Ltd.
- Efam Air LtdInstallers
- Garden Maintenance & Design LtdLandscapers and gardeners
- Struere Infrastructure LtdSpecialist contractors
What happens if Rock Core 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 24 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 25 Oct 2026 to 24 Nov 2026 | £150 |
| 1 to 3 months late | 25 Nov 2026 to 24 Jan 2027 | £375 |
| 3 to 6 months late | 25 Jan 2027 to 24 Apr 2027 | £750 |
| More than 6 months late | From 25 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 25 Jan 2027 | £200 |
| 3 months late | 24 Apr 2027 | another £200 |
| 6 months late | 24 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 24 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
- 13709127
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 October 2021 (4 years ago)
- Registered office
- Unit 6/7 Teybrook Centre Brook Road, Great Tey, Colchester, Essex, CO6 1JE
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 28 October (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 October 2024
- Last confirmation statement
- 27 October 2025
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Colchester
Other active civil engineering contractors registered in Colchester.
- S.T.C Carpentry Limited2018
- Seismic Construction Ltd2026
- SLB Roads Ltd2019
- SP Pipeline & Sewers Ltd2022
- Star Design Solutions Ltd2014
- Stephen Minshull Ltd2024
- Stoken Properties Limited2001
- Stonebridge Services Limited2021
All civil engineering contractors in Colchester · All trades in Colchester · Civil engineering across the UK
Frequently asked questions
When are Rock Core Ltd's accounts due?
Rock Core Ltd's next accounts are due at Companies House by 24 October 2026 (in 12 days), covering the period to 24 January 2026.
When is Rock Core Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 October 2025, due by 31 October 2026, and one for the period to 24 January 2026, due by 24 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Rock Core Ltd still trading?
Rock Core 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 Core Ltd do?
Rock Core Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Rock Core Ltd?
Rock Core Ltd was incorporated on 28 October 2021, 4 years ago.
What is the penalty if Rock Core 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 Core 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.