- Companies
- Specialist contractors
- Castlewellan
- Cast Build Limited
Cast Build Limited
- Company number
- NI629437
- Incorporated
- 16 Feb 201511 years trading
- Registered office
- 40-42 Lower Square, Lower Square, Castlewellan, BT31 9DW
- Nature of business
- Other specialised construction activities n.e.c.
Cast Build Limited is a 11-year-old private limited company registered in Castlewellan, company number NI629437, one of 12 specialist construction companies in Castlewellan. Companies House shows its accounts as overdue: they were due on 31 May 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 £1,372 (+2.6%) on the year before, to £54K.
- Net assets rose in 5 of 8 year-on-year comparisons on record.
- Current assets of £275K against £200K owed within a year: 1.4 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 9 years, 2016 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2024 | £54K | £275K | £200K | 1 | |
| 31 May 2023 | £53K | £230K | £148K | 1 | |
| 31 May 2022 | £88K | £286K | £153K | 1 | |
| 31 May 2021 | £65K | £189K | £130K | 0 | |
| 31 May 2020 | £35K | £112K | £88K | 0 | |
| 31 May 2019 | £62K | £120K | £71K | ||
| 31 May 2018 | £29K | £56K | £34K | ||
| 28 Feb 2017 | £58K | £93K | £42K | ||
| 28 Feb 2016 | £2,112 | £5,899 | £19K | £17K |
Where Cast Build Limited is registered
The registered office is in Castlewellan (BT31), in the Newry, Mourne and Down local authority area, Northern Ireland. Show BT31 9DW on a map.
Other trade companies in BT31
- Ogm26 LtdGroundworks and demolition
- Treadline Tyre & Auto Services LtdMechanics and garages
- CB Fire Compliance LimitedSpecialist contractors
- Cea Joinery LtdJoiners and carpenters
- NI.CBR LtdMechanics and garages
- S.D.E Electrical Systems LtdElectricians
- Jam Civils & Utilities LtdGroundworks and demolition
- B McVeigh Mechanical LtdPlumbers and heating engineers
What happens if Cast Build Limited files late
If the accounts reach Companies House today, the late filing penalty is £750 (£1,500 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2026 to 30 Jun 2026 | £150 |
| 1 to 3 months late | 1 Jul 2026 to 31 Aug 2026 | £375 |
| 3 to 6 months late | 1 Sep 2026 to 30 Nov 2026 | £750 |
| More than 6 months late | From 1 Dec 2026 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2026 | £200 |
| 3 months late | 30 Nov 2026 | another £200 |
| 6 months late | 28 Feb 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 2027 | 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
- NI629437
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 February 2015 (11 years ago)
- Registered office
- 40-42 Lower Square, Lower Square, Castlewellan, BT31 9DW
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2024
- Last confirmation statement
- 1 May 2026
- Previous names
- Castle Eden Contracts Ltd (until 27 Oct 2021)
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 in Castlewellan
Other active specialist construction companies registered in Castlewellan.
- CB Fire Compliance Limited2026
- CMC Shuttering Ltd2017
- Construction Sealants (Ireland) Ltd2016
- D G McClean Ltd2025
- Dunlevy Contracts Limited2010
- MJ Oldbridge Developments Ltd2018
- PD Plant Hire Ltd2017
- R. McCabe Services Ltd2005
All specialist construction companies in Castlewellan · All trades in Castlewellan · Specialist contractors across the UK
Frequently asked questions
When are Cast Build Limited's accounts due?
Cast Build Limited's accounts were due at Companies House on 31 May 2026 and the register shows them as overdue.
When is Cast Build 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 31 May 2025, due by 31 May 2026, and one for the period to 31 August 2025, due by 31 August 2026. Corporation tax is payable 9 months and 1 day after the end of each.
Is Cast Build Limited still trading?
Cast Build Limited is listed as active on the Companies House register (checked 12 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 Cast Build Limited do?
Cast Build Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Cast Build Limited?
Cast Build Limited was incorporated on 16 February 2015, 11 years ago.
What is the penalty if Cast Build 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 Cast Build Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.