- Companies
- Electricians
- Leicester
- Jonstar Sustainable Technologies Ltd
Jonstar Sustainable Technologies Ltd
- Company number
- 12522599
- Incorporated
- 18 Mar 20206 years trading
- Registered office
- 21 Wellington Street, Leicester, LE1 6HH
- Nature of business
- Electrical installation; Plumbing, heat and air-conditioning installation; Other professional, scientific and technical activities n.e.c.
Jonstar Sustainable Technologies Ltd is a 6-year-old private limited company registered in Leicester, company number 12522599, one of 312 electrical contractors in Leicester. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Jonstar Sustainable Technologies LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 up £32K (+13%) on the year before, to £275K.
- Net assets rose in 4 of 5 year-on-year comparisons on record.
- Current assets of £363K against £89K owed within a year: 4.1 times cover.
- 5 employees on average during the year.
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £275K | £363K | £89K | 5 | |
| 31 Mar 2025 | £243K | £265K | £22K | 5 | |
| 31 Mar 2024 | £274K | £298K | £24K | 4 | |
| 31 Mar 2023 | £190K | £185K | £5,311 | 2 | |
| 31 Mar 2022 | £88K | £254K | £166K | 2 | |
| 31 Mar 2021 | £19K | £84K | £66K | 1 |
Public contracts won
Jonstar Sustainable Technologies Ltd has 4 public sector contract awards on record; the ones with their own published value total £488K, from 2025 to 2026. Source: Contracts Finder and Find a Tender award notices. 2 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Housing 214 awards
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Housing 21 | Solar PV Installation to Roof | £76K | 20 Feb 2026 |
| Housing 21 | Solar panel installation | £74K | 16 Jan 2026 |
| Housing 21 | Solar Installation and Remediation Works | £244K | 14 Nov 2025 |
| Housing 21 | Solar panel installation | £93K | 24 Oct 2025 |
Where Jonstar Sustainable Technologies Ltd is registered
The registered office is in Leicester (LE1), in the Leicester local authority area, East Midlands. Show LE1 6HH on a map.
Other trade companies in LE1
- Daja Developments LtdProperty developers
- All Drives Prestige LtdLandscapers and gardeners
- M.S Motor Group LtdMotor traders
- Rieznikova Property Finishing LimitedFinishing trades
- Sweep Away Property Services LtdCleaning companies
- K1 Construction SFX LtdPlumbers and heating engineers
- Empire Construction Group LtdBuilders
- Pavetar Roofing LtdRoofers
What happens if Jonstar Sustainable Technologies 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 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 12522599
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 March 2020 (6 years ago)
- Registered office
- 21 Wellington Street, Leicester, LE1 6HH
- Nature of business
- Electrical installation (SIC 43210)
Plumbing, heat and air-conditioning installation (SIC 43220)
Other professional, scientific and technical activities n.e.c. (SIC 74909) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 4 February 2026
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Leicester
Other active electrical contractors registered in Leicester.
- JPD Electrical Services Limited2015
- Jti Electrical Ltd2023
- K C O'Sullivan Electrical Contractors Ltd2019
- K M Electricals (Leic) Ltd2015
- K.O. Electrics Limited1999
- Kas Electrical Services (Leicester) Ltd2024
- Kas Solar Services Limited2024
- KGB Electrics Ltd2013
All electrical contractors in Leicester · All trades in Leicester · Electricians across the UK
Frequently asked questions
When are Jonstar Sustainable Technologies Ltd's accounts due?
Jonstar Sustainable Technologies Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Jonstar Sustainable Technologies Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Jonstar Sustainable Technologies Ltd still trading?
Jonstar Sustainable Technologies 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 Jonstar Sustainable Technologies Ltd do?
Jonstar Sustainable Technologies Ltd is registered under Electrical installation (SIC 43210); Plumbing, heat and air-conditioning installation (SIC 43220); Other professional, scientific and technical activities n.e.c. (SIC 74909).
How old is Jonstar Sustainable Technologies Ltd?
Jonstar Sustainable Technologies Ltd was incorporated on 18 March 2020, 6 years ago.
Has Jonstar Sustainable Technologies Ltd won public sector contracts?
Yes. Jonstar Sustainable Technologies Ltd has 4 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £488K), most recently from HOUSING 21.
What is the penalty if Jonstar Sustainable Technologies 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 Jonstar Sustainable Technologies 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.