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- Mainsborough Developments Limited
Company profile · Property developers
Mainsborough Developments Limited
Mainsborough Developments Limited is a 1-year-old private limited company registered in Romsey, company number 16036087, one of 70 property development companies in Romsey. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 October 2025, as filed at Companies House.
Where Mainsborough Developments Limited is registered
The registered office is in Romsey (SO51), in the Test Valley local authority area, South East. Show SO51 8HJ on a map.
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What happens if Mainsborough Developments 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 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 16036087
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 October 2024 (1 year ago)
- Registered office
- 3 Middlebridge Street, Romsey, SO51 8HJ
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 22 October 2025
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Romsey
Other active property development companies registered in Romsey.
- Manor Nursery Limited2014
- MC Property Repairs Ltd2019
- Meadebrook Homes Limited2002
- MMP FD Limited2012
- Newmead Properties Limited2019
- Nightingale (Nicholas) Limited2018
- Orchard (Shamblehurst Lane North) Limited2013
- Pelleas Homes Limited2024
All property development companies in Romsey · All trades in Romsey · Property developers across the UK
Frequently asked questions
When are Mainsborough Developments Limited's accounts due?
Mainsborough Developments Limited's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is Mainsborough Developments Limited's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Mainsborough Developments Limited still trading?
Mainsborough Developments 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 Mainsborough Developments Limited do?
Mainsborough Developments Limited is registered under Development of building projects (SIC 41100).
How old is Mainsborough Developments Limited?
Mainsborough Developments Limited was incorporated on 23 October 2024, 1 year ago.
What is the penalty if Mainsborough Developments 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 Mainsborough Developments Limited on Companies House for filed documents, officers and the full history.
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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.