- Companies
- Specialist contractors
- Sheffield
- One Insulation Ltd
One Insulation Ltd
- Company number
- 12564346
- Incorporated
- 20 Apr 20206 years trading
- Registered office
- Bold House, 29 Bold Street, Sheffield, S9 2LR
- Nature of business
- Other specialised construction activities n.e.c.
One Insulation Ltd is a 6-year-old private limited company registered in Sheffield, company number 12564346, one of 267 specialist construction companies in Sheffield. Its next accounts are due at Companies House on 29 January 2027, and the CT600 for the period to 29 April 2026 is due at HMRC on 29 April 2027.
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 down £11K (-514.3%) on the year before, to -£8,700.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £294K against £346K owed within a year: 0.8 times cover.
- 12 employees 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 |
|---|---|---|---|---|---|
| 30 Apr 2025 | -£8,700 | £13 | £294K | £346K | 12 |
| 30 Apr 2024 | £2,100 | £25K | £292K | £345K | 12 |
| 30 Apr 2023 | -£14K | £10K | £149K | £219K | 13 |
| 30 Apr 2022 | £6,120 | £7,188 | £144K | £170K | 10 |
| 30 Apr 2021 | £84K | £9,597 | £151K | £67K | 9 |
Where One Insulation Ltd is registered
The registered office is in Sheffield (S9), in the Sheffield local authority area, Yorkshire and The Humber. Show S9 2LR on a map.
Other trade companies in S9
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- The Kitchen and Worktop Company LtdFinishing trades
- Steel City Tyrez LtdMechanics and garages
- Day to Day Cleaners Yorkshire LimitedCleaning companies
- Property Medics South Yorkshire LtdProperty developers
- Rka Building Construction LtdFinishing trades
- The Driveway Company Sheffield LtdLandscapers and gardeners
- Abiza & Co Private LimitedBuilders
What happens if One Insulation 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 29 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Jan 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 29 Apr 2027 | £375 |
| 3 to 6 months late | 30 Apr 2027 to 29 Jul 2027 | £750 |
| More than 6 months late | From 30 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Apr 2027 | £200 |
| 3 months late | 29 Jul 2027 | another £200 |
| 6 months late | 29 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Apr 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
- 12564346
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 April 2020 (6 years ago)
- Registered office
- Bold House, 29 Bold Street, Sheffield, S9 2LR
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 29 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 19 April 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Sheffield
Other active specialist construction companies registered in Sheffield.
- Oph (Projects) Ltd2025
- Orange Stone Properties Ltd2019
- Owen Joseph Limited2013
- Oxhorn Limeworks Limited2023
- Parkhead Construction Limited2018
- Pdi Civils Ltd2014
- Peak Lifting Solutions Limited2025
- Peter Hartley Limited1991
All specialist construction companies in Sheffield · All trades in Sheffield · Specialist contractors across the UK
Frequently asked questions
When are One Insulation Ltd's accounts due?
One Insulation Ltd's next accounts are due at Companies House by 29 January 2027 (in 109 days), covering the period to 29 April 2026.
When is One Insulation Ltd's CT600 due?
The CT600 for the period to 29 April 2026 is due at HMRC by 29 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 30 January 2027.
Is One Insulation Ltd still trading?
One Insulation 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 One Insulation Ltd do?
One Insulation Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is One Insulation Ltd?
One Insulation Ltd was incorporated on 20 April 2020, 6 years ago.
What is the penalty if One Insulation 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 One Insulation 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.