- Company number
- 17161244
- Incorporated
- 16 Apr 2026
- Registered office
- Unit 10 Monks Brook Industrial Park, School Close, Chandler's Ford, Eastleigh, SO53 4RA
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Mackoy SW Ltd is a newly incorporated private limited company registered in Eastleigh, company number 17161244, one of 89 building contractors in Eastleigh. Its next accounts are due at Companies House on 16 January 2028, and its first CT600 is due at HMRC on 15 April 2028.
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.
Is this your company?
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Where Mackoy SW Ltd is registered
The registered office is in Eastleigh (SO53), in the Test Valley local authority area, South East. Show SO53 4RA on a map.
Other trade companies in SO53
- Surface Dressing UK LtdCivil engineering
- Audin Construction LtdSpecialist contractors
- Jelly West Developments LtdProperty developers
- Climate and Renewables Service LtdPlumbers and heating engineers
- McCarthy Construct LimitedProperty developers
- Cura Projects LimitedFinishing trades
- Tubmate LtdMachinery repair and installation
- Brook Hill Developments LimitedProperty developers
What happens if Mackoy SW 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 16 January 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 17 Jan 2028 to 16 Feb 2028 | £150 |
| 1 to 3 months late | 17 Feb 2028 to 16 Apr 2028 | £375 |
| 3 to 6 months late | 17 Apr 2028 to 16 Jul 2028 | £750 |
| More than 6 months late | From 17 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2028 | £200 |
| 3 months late | 30 Jul 2028 | another £200 |
| 6 months late | 30 Oct 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 17161244
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 April 2026
- Registered office
- Unit 10 Monks Brook Industrial Park, School Close, Chandler's Ford, Eastleigh, SO53 4RA
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 30 April (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 Eastleigh
Other active building contractors registered in Eastleigh.
- Mapledean Special Projects Limited2000
- Mario Drylining Ltd2017
- Mark Sainsbury Builder Limited2003
- MB Automation Build Ltd2021
- Meu Construction Ltd2025
- MH Bespoke Renovations Ltd2026
- MHT Renovations Limited2025
- Mike Jacobs (Builders) Limited2004
All building contractors in Eastleigh · All trades in Eastleigh · Builders across the UK
Frequently asked questions
When are Mackoy SW Ltd's accounts due?
Mackoy SW Ltd's next accounts are due at Companies House by 16 January 2028 (in 460 days), covering the period to 30 April 2027.
When is Mackoy SW 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 15 April 2027, due by 15 April 2028, and one for the period to 30 April 2027, due by 30 April 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Mackoy SW Ltd still trading?
Mackoy SW 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 Mackoy SW Ltd do?
Mackoy SW Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Mackoy SW Ltd?
Mackoy SW Ltd was incorporated on 16 April 2026, less than a year ago.
What is the penalty if Mackoy SW 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 Mackoy SW 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.