- Companies
- Installers
- Llandudno Junction
- MJS Building Systems (NW) Ltd
MJS Building Systems (NW) Ltd
- Company number
- 12362395
- Incorporated
- 13 Dec 20196 years trading
- Registered office
- Anson House, 1 Cae'r Llynen, Llandudno Junction, LL31 9LS
- Nature of business
- Other construction installation
MJS Building Systems (NW) Ltd is a 6-year-old private limited company registered in Llandudno Junction, company number 12362395, one of the UK's installation companies (insulation, lifts, shutters and similar). Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 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 £19K on the year before, to £20K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £109K against £76K owed within a year: 1.4 times cover.
- 2 employees on average, up from -2 the year before.
- Balance sheets on record for 5 years, 2020 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £20K | £3,171 | £109K | £76K | 2 |
| 31 Dec 2023 | £965 | £16K | £138K | £123K | -2 |
| 31 Dec 2022 | £2,805 | £20K | £110K | £78K | -2 |
| 31 Dec 2021 | -£33K | £50K | £40K | 3 | |
| 31 Dec 2020 | £224 | £20K | £27K | 3 |
Where MJS Building Systems (NW) Ltd is registered
The registered office is in Llandudno Junction (LL31), in the Conwy local authority area, Wales. Show LL31 9LS on a map.
Other trade companies in LL31
- CCM Paving LtdSpecialist contractors
- Itech LtdElectricians
- K O Wind LtdElectricians
- R.Jones Roofing LtdRoofers
- Paragon Consult LtdSpecialist contractors
- Colwyn Construction LtdBuilders
- Evansrenewables LtdProperty developers
- Northwest Solar and Roofing LtdRoofers
Also registered at this address
9 other companies use the same registered office as MJS Building Systems (NW) Ltd.
- Beau Bridge Development LimitedJoiners and carpenters
- Beech Developments (Chwilog) LtdProperty developers
- Beech Developments (NW) LimitedProperty developers
- D & J Jarvis LimitedFinishing trades
- DP Consulting (NW) LimitedMechanics and garages
- Glanwest LtdCivil engineering
- JSJ Joinery LimitedJoiners and carpenters
- North Wales Plastics LtdRoofers
- Sustainable Warmth LimitedSpecialist contractors
What happens if MJS Building Systems (NW) 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 12362395
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 December 2019 (6 years ago)
- Registered office
- Anson House, 1 Cae'r Llynen, Llandudno Junction, LL31 9LS
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 12 December 2025
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
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Other active installation companies (insulation, lifts, shutters and similar) registered in Llandudno Junction.
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Frequently asked questions
When are MJS Building Systems (NW) Ltd's accounts due?
MJS Building Systems (NW) Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is MJS Building Systems (NW) 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 December 2025, due by 31 December 2026, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is MJS Building Systems (NW) Ltd still trading?
MJS Building Systems (NW) 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 MJS Building Systems (NW) Ltd do?
MJS Building Systems (NW) Ltd is registered under Other construction installation (SIC 43290).
How old is MJS Building Systems (NW) Ltd?
MJS Building Systems (NW) Ltd was incorporated on 13 December 2019, 6 years ago.
What is the penalty if MJS Building Systems (NW) 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 MJS Building Systems (NW) 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.