- Company number
- 12622879
- Incorporated
- 26 May 20206 years trading
- Registered office
- 63 Eddy Close, Romford, RM7 9HR
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Isotec Ltd is a 6-year-old private limited company registered in Romford, company number 12622879, one of 911 building contractors in Romford. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 May 2025, as filed at Companies House.
Isotec Ltd over the years
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 £6,450 (+104.1%) on the year before, to £13K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £21K against £8,697 owed within a year: 2.5 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £13K | £655 | £21K | £8,697 | 1 |
| 31 May 2024 | £6,198 | £148 | £20K | £14K | 1 |
| 31 May 2023 | £13K | £2,242 | £22K | £9,112 | 1 |
| 31 May 2022 | £17K | £9,283 | £23K | £6,238 | 1 |
| 31 May 2021 | £4 | £6,523 | 1 |
Where Isotec Ltd is registered
The registered office is in Romford (RM7), in the Havering local authority area, London. Show RM7 9HR on a map.
Other trade companies in RM7
- Te Cars LimitedMotor traders
- PW Pristine Property LtdCleaning companies
- Sunrise Landscaping LtdLandscapers and gardeners
- Square Edge Grounds Works LimitedProperty developers
- Ravin London Construction LimitedBuilders
- LND Cleanning Services LtdBuilders
- Jim Group Home Improvements LtdBuilders
- MT Tahiri Construction LtdBuilders
What happens if Isotec 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 12622879
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 May 2020 (6 years ago)
- Registered office
- 63 Eddy Close, Romford, RM7 9HR
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 31 May (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 13 July 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 Romford
Other active building contractors registered in Romford.
- Issf Ltd2020
- Isy Contractors Ltd2025
- Ital Constructions Ltd2023
- Iuga Ltd2023
- Ivn Fire Protection Limited2015
- Ivv Construction Ltd2025
- J Badshah Builders Ltd2024
- J R Singh Ltd2026
All building contractors in Romford · All trades in Romford · Builders across the UK
Frequently asked questions
When are Isotec Ltd's accounts due?
Isotec Ltd's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is Isotec Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Isotec Ltd still trading?
Isotec 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 Isotec Ltd do?
Isotec Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Isotec Ltd?
Isotec Ltd was incorporated on 26 May 2020, 6 years ago.
What is the penalty if Isotec 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 Isotec 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.