Company profile · Builders
Isidor Ltd
Isidor Ltd is a 2-year-old private limited company registered in Luton, company number 16010780, one of 708 building contractors in Luton. 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 Isidor Ltd is registered
The registered office is in Luton (LU2), in the Luton local authority area, East of England. Show LU2 9LH on a map.
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What happens if Isidor 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 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
- 16010780
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 October 2024 (2 years ago)
- Registered office
- 129 Brendon Avenue, Luton, LU2 9LH
- Nature of business
- Construction of domestic buildings (SIC 41202)
Freight transport by road (SIC 49410) - Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 9 October 2025
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 Luton
Other active building contractors registered in Luton.
- Ist Choice Builders Ltd2025
- Isufaj Services Ltd2025
- Iucon Ltd2015
- Iurem Ltd2020
- J & C Flanagan Construction Ltd2005
- J E R Developments Limited2001
- J&C Building & Maintenance Ltd2026
- J&C Drylining Limited2021
All building contractors in Luton · All trades in Luton · Builders across the UK
Frequently asked questions
When are Isidor Ltd's accounts due?
Isidor Ltd's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is Isidor Ltd'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 Isidor Ltd still trading?
Isidor 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 Isidor Ltd do?
Isidor Ltd is registered under Construction of domestic buildings (SIC 41202); Freight transport by road (SIC 49410).
How old is Isidor Ltd?
Isidor Ltd was incorporated on 10 October 2024, 2 years ago.
What is the penalty if Isidor 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 Isidor 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.