- Company number
- 10388655
- Incorporated
- 22 Sep 201610 years trading
- Registered office
- 79 Poynters Road, Poynters Road, Dunstable, LU5 4SQ
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings; Plumbing, heat and air-conditioning installation
McOnstantin Ltd is a 10-year-old private limited company registered in Dunstable, company number 10388655, one of 213 building contractors in Dunstable. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £1,832 (+90.7%) on the year before, to £3,852.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £18K against £14K owed within a year: 1.3 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £3,852 | £18K | £14K | 3 | |
| 31 Mar 2025 | £2,020 | £20K | £17K | 3 | |
| 31 Mar 2024 | £1,567 | £34K | £32K | 2 | |
| 31 Mar 2023 | £4,329 | £48K | £44K | 1 | |
| 31 Mar 2022 | £1,054 | £33K | £32K | 1 | |
| 31 Mar 2021 | £341 | £29K | £29K | 2 | |
| 31 Mar 2020 | £235 | £15K | £14K | 2 | |
| 31 Mar 2019 | £178 | £22K | £22K | ||
| 31 Mar 2018 | £365 | £14K | £14K | ||
| 31 Mar 2017 | £8 | £7,535 | £7,527 |
Where McOnstantin Ltd is registered
The registered office is in Dunstable (LU5), in the Central Bedfordshire local authority area, East of England. Show LU5 4SQ on a map.
Other trade companies in LU5
- Holz Stehlen Interiors LtdJoiners and carpenters
- Group V Motors LimitedMotor traders
- Marsiv LtdBuilders
- FB Engineering Solutions LtdSpecialist contractors
- Valmir Plastering LtdPlasterers
- Jeeva Engineering LtdCivil engineering
- Shinning Stars Cleaning LtdCleaning companies
- Coc Floring LtdBuilders
What happens if McOnstantin 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 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 10388655
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 September 2016 (10 years ago)
- Registered office
- 79 Poynters Road, Poynters Road, Dunstable, LU5 4SQ
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202)
Plumbing, heat and air-conditioning installation (SIC 43220) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 2 September 2026
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 Dunstable
Other active building contractors registered in Dunstable.
- MD Specialist Services Ltd2025
- Minea V&L Mep Services Ltd2026
- Mir1977 Ltd2024
- Miro Building Services Ltd2026
- Miron Construction Ltd2012
- Mititel Construction Services Limited2017
- MNK&Co Limited2022
- Mortimer Design & Build Limited2024
All building contractors in Dunstable · All trades in Dunstable · Builders across the UK
Frequently asked questions
When are McOnstantin Ltd's accounts due?
McOnstantin Ltd's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is McOnstantin Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is McOnstantin Ltd still trading?
McOnstantin 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 McOnstantin Ltd do?
McOnstantin Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202); Plumbing, heat and air-conditioning installation (SIC 43220).
How old is McOnstantin Ltd?
McOnstantin Ltd was incorporated on 22 September 2016, 10 years ago.
What is the penalty if McOnstantin 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 McOnstantin 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.