- Companies
- Specialist contractors
- Castle Engineering & Construction Company Limited
Castle Engineering & Construction Company Limited
- Company number
- NI048958
- Incorporated
- 5 Dec 200322 years trading
- Registered office
- C/O Diamond + Skillen, Sinclair House, 89/101 Royal Avenue, Belfast, BT1 1FE
- Nature of business
- Other specialised construction activities n.e.c.; General cleaning of buildings
Castle Engineering & Construction Company Limited is a 22-year-old private limited company registered in 89/101 Royal Avenue, company number NI048958, one of the UK's specialist construction companies. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 £109K (+291.2%) on the year before, to £146K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £185K against £44K owed within a year: 4.2 times cover.
- 10 employees on average, down from 12 the year before.
- 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 Nov 2025 | £146K | £185K | £44K | 10 | |
| 30 Nov 2024 | £37K | £197K | £45K | 12 | |
| 30 Nov 2023 | £67K | £294K | £92K | 22 | |
| 30 Nov 2022 | £152K | £250K | £419K | £114K | 47 |
| 30 Nov 2021 | £120K | £272K | £414K | £123K | 47 |
| 30 Nov 2020 | £92K | £245K | £473K | £240K | 44 |
| 30 Nov 2019 | £111K | £120K | £466K | £209K | 50 |
| 30 Nov 2018 | £83K | £74K | £447K | £64K | 50 |
| 30 Nov 2017 | £71K | £38K | £448K | £66K | 53 |
| 30 Nov 2016 | £90K | £81K | £475K | £243K |
Where Castle Engineering & Construction Company Limited is registered
The registered office is in 89/101 Royal Avenue (BT1), in the Belfast local authority area, Northern Ireland. Show BT1 1FE on a map.
Other trade companies in BT1
- Atlas Property and Holdings LtdProperty developers
- Geohac LimitedGroundworks and demolition
- XM Vehicle Solutions LimitedMotor traders
- Shine Renewables NI LimitedElectricians
- The Rathstone Group LtdCleaning companies
- Chenyukeji LtdMotor traders
- Linnexttech Shop LtdMotor traders
- Techright Environmental Ireland LtdCleaning companies
What happens if Castle Engineering & Construction Company 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 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
- NI048958
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 December 2003 (22 years ago)
- Registered office
- C/O Diamond + Skillen, Sinclair House, 89/101 Royal Avenue, Belfast, BT1 1FE
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
General cleaning of buildings (SIC 81210) - Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 5 December 2025
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies
Other active specialist construction companies.
Frequently asked questions
When are Castle Engineering & Construction Company Limited's accounts due?
Castle Engineering & Construction Company Limited's next accounts are due at Companies House by 31 August 2027 (in 321 days), covering the period to 30 November 2026.
When is Castle Engineering & Construction Company Limited's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is Castle Engineering & Construction Company Limited still trading?
Castle Engineering & Construction Company 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 Castle Engineering & Construction Company Limited do?
Castle Engineering & Construction Company Limited is registered under Other specialised construction activities n.e.c. (SIC 43999); General cleaning of buildings (SIC 81210).
How old is Castle Engineering & Construction Company Limited?
Castle Engineering & Construction Company Limited was incorporated on 5 December 2003, 22 years ago.
What is the penalty if Castle Engineering & Construction Company 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 Castle Engineering & Construction Company 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.