- Companies
- Electricians
- Newmarket
- Cartwright Brothers Limited
Cartwright Brothers Limited
- Company number
- 09382805
- Incorporated
- 12 Jan 201511 years trading
- Registered office
- 7 Laureate Paddocks, Newmarket, Suffolk, CB8 0AP
- Nature of business
- Electrical installation
Cartwright Brothers Limited is a 11-year-old private limited company registered in Newmarket, company number 09382805, one of 28 electrical contractors in Newmarket. Its next accounts are due at Companies House on 28 June 2027, and the CT600 for the period to 28 September 2026 is due at HMRC on 28 September 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 £1,177 (-91.5%) on the year before, to £109.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £32K against £29K owed within a year: 1.1 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £109 | £32K | £29K | 0 | |
| 30 Sep 2024 | £1,286 | £35K | £31K | 4 | |
| 30 Sep 2023 | £596 | £37K | £34K | 4 | |
| 30 Sep 2022 | £354 | £56K | £54K | 4 | |
| 30 Sep 2021 | £1,929 | £83K | £80K | 5 | |
| 30 Sep 2020 | £3,360 | £75K | £71K | 5 | |
| 30 Sep 2019 | £1,485 | £92K | £90K | 4 | |
| 30 Sep 2018 | £15K | £117K | £102K | 4 | |
| 30 Sep 2017 | £25K | £96K | £72K | 4 | |
| 30 Sep 2016 | £28K | £79K | £97K | £71K |
Where Cartwright Brothers Limited is registered
The registered office is in Newmarket (CB8), in the West Suffolk local authority area, East of England. Show CB8 0AP on a map.
Other trade companies in CB8
- Houndworks Property Maintenance LtdCleaning companies
- Ajm Carpentry & Construction LtdBuilders
- Gemland Automotive LimitedMechanics and garages
- Safi Autobody Shop LimitedMechanics and garages
- BC Plumbing & Heating Contractors LtdPlumbers and heating engineers
- Anglia Landscaping Group LimitedLandscapers and gardeners
- Zee Mobile Tyres LtdMotor traders
- Ajs Developments (Burwell) LimitedProperty developers
Shared registered office
45 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Cartwright Brothers 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 28 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 29 Jun 2027 to 28 Jul 2027 | £150 |
| 1 to 3 months late | 29 Jul 2027 to 28 Sep 2027 | £375 |
| 3 to 6 months late | 29 Sep 2027 to 28 Dec 2027 | £750 |
| More than 6 months late | From 29 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Sep 2027 | £200 |
| 3 months late | 28 Dec 2027 | another £200 |
| 6 months late | 28 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Sep 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
- 09382805
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 January 2015 (11 years ago)
- Registered office
- 7 Laureate Paddocks, Newmarket, Suffolk, CB8 0AP
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 28 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 12 January 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 Newmarket
Other active electrical contractors registered in Newmarket.
- Copping Electrical Services Limited2010
- CSL Newmarket Electrical Ltd2024
- D W Tonge Electrical Ltd2017
- D&S Electrical Installations Ltd2021
- Dale Jeffery Electrical Services Limited2000
- DSJB Electrical Limited2015
- Electrical Installation (Cambridge) Limited1961
- Farrant Holdings Limited1986
All electrical contractors in Newmarket · All trades in Newmarket · Electricians across the UK
Frequently asked questions
When are Cartwright Brothers Limited's accounts due?
Cartwright Brothers Limited's next accounts are due at Companies House by 28 June 2027 (in 258 days), covering the period to 28 September 2026.
When is Cartwright Brothers Limited's CT600 due?
The CT600 for the period to 28 September 2026 is due at HMRC by 28 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 29 June 2027.
Is Cartwright Brothers Limited still trading?
Cartwright Brothers 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 Cartwright Brothers Limited do?
Cartwright Brothers Limited is registered under Electrical installation (SIC 43210).
How old is Cartwright Brothers Limited?
Cartwright Brothers Limited was incorporated on 12 January 2015, 11 years ago.
What is the penalty if Cartwright Brothers 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 Cartwright Brothers Limited 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.