- Company number
- 16860177
- Incorporated
- 17 Nov 2025
- Registered office
- Room 3&4, Rood End House, 6 Stortford Road, Dunmow, CM6 1DA
- Nature of business
- Construction of commercial buildings
Castleside Construction Limited is a newly incorporated private limited company registered in Dunmow, company number 16860177, one of 42 building contractors in Dunmow. Its next accounts are due at Companies House on 17 August 2027, and its first CT600 is due at HMRC on 16 November 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Castleside Construction Limited is registered
The registered office is in Dunmow (CM6), in the Uttlesford local authority area, East of England. Show CM6 1DA on a map.
Other trade companies in CM6
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- Aston Cord (Southern) LimitedPlumbers and heating engineers
- Alhs Properties LimitedProperty developers
- Gibson & Co. Contracts LimitedElectricians
- Norson Tyres and Detailing LtdMechanics and garages
- Om Roofing and Building Contractors LtdBuilders
- Z T Auto LtdMotor traders
- Patsons Ac LtdPlumbers and heating engineers
What happens if Castleside Construction 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 17 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 18 Aug 2027 to 17 Sep 2027 | £150 |
| 1 to 3 months late | 18 Sep 2027 to 17 Nov 2027 | £375 |
| 3 to 6 months late | 18 Nov 2027 to 17 Feb 2028 | £750 |
| More than 6 months late | From 18 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 16860177
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 November 2025
- Registered office
- Room 3&4, Rood End House, 6 Stortford Road, Dunmow, CM6 1DA
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 30 November (accounting reference date)
- Accounts type
- No accounts filed yet
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 Dunmow
Other active building contractors registered in Dunmow.
- Corringales Limited2016
- DJH Commissioning Limited2025
- Elaron Services Limited2021
- Essex Emergency Plumbing Ltd2025
- Freeflo Utilities Ltd2025
- Fusion Roofing and Property Services Ltd2021
- Great Clerkes Farm Limited2024
- Invita Construction Ltd2023
All building contractors in Dunmow · All trades in Dunmow · Builders across the UK
Frequently asked questions
When are Castleside Construction Limited's accounts due?
Castleside Construction Limited's next accounts are due at Companies House by 17 August 2027 (in 308 days), covering the period to 30 November 2026.
When is Castleside Construction Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 16 November 2026, due by 16 November 2027, and one for the period to 30 November 2026, due by 30 November 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Castleside Construction Limited still trading?
Castleside Construction 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 Castleside Construction Limited do?
Castleside Construction Limited is registered under Construction of commercial buildings (SIC 41201).
How old is Castleside Construction Limited?
Castleside Construction Limited was incorporated on 17 November 2025, less than a year ago.
What is the penalty if Castleside Construction 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 Castleside Construction 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.