- Companies
- Installers
- Eastbourne
- C-Thru Windows, Doors & Conservatories Ltd
C-Thru Windows, Doors & Conservatories Ltd
- Company number
- 13180911
- Incorporated
- 4 Feb 20215 years trading
- Registered office
- Chantry House, 22 Upperton Road, Eastbourne, East Sussex, BN21 1BF
- Nature of business
- Other construction installation; Glazing
C-Thru Windows, Doors & Conservatories Ltd is a 5-year-old private limited company registered in Eastbourne, company number 13180911, one of 50 installation companies (insulation, lifts, shutters and similar) in Eastbourne. Its next accounts are due at Companies House on 30 November 2027, and the CT600 for the period to 28 February 2027 is due at HMRC on 28 February 2028.
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 £12 (-2.5%) on the year before, to £471.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £72K against £75K owed within a year: 1.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 5 years, 2022 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2026 | £471 | £25K | £72K | £75K | 0 |
| 28 Feb 2025 | £483 | £23K | £42K | £46K | 2 |
| 29 Feb 2024 | £29K | £34K | £88K | £66K | 2 |
| 28 Feb 2023 | £31K | £38K | £85K | £62K | 2 |
| 28 Feb 2022 | £25K | £56K | £41K | 2 |
Who runs and owns C-Thru Windows, Doors & Conservatories Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| S*** M*** | Director | Feb 2021 |
| S*** B*** | Director | Mar 2022 |
People with significant control (2)
Where C-Thru Windows, Doors & Conservatories Ltd is registered
The registered office is in Eastbourne (BN21), in the Eastbourne local authority area, South East. Show BN21 1BF on a map.
Other trade companies in BN21
- Solaris Motors Solutions LimitedMechanics and garages
- Chartwell Design and Build LimitedBuilders
- The Sussex Flint Company LtdBuilders
- Wealden Property Services LimitedSpecialist contractors
- Oliver J Stean Plumbing & Heating LimitedPlumbers and heating engineers
- Ac Plastering & Rendering LtdPlasterers
- Coxon Construction Group LtdProperty developers
- Able Cleaning and Property Maintenance LimitedCleaning companies
Also registered at this address
5 other companies use the same registered office as C-Thru Windows, Doors & Conservatories Ltd.
- Audio Visual Services LtdMachinery repair and installation
- Deallow LimitedSpecialist contractors
- Eastgate (Kent) Development LtdProperty developers
- The Gate Building Development Company LtdProperty developers
- Waterman Medlock LtdProperty developers
What happens if C-Thru Windows, Doors & Conservatories 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 30 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2027 to 31 Dec 2027 | £150 |
| 1 to 3 months late | 1 Jan 2028 to 29 Feb 2028 | £375 |
| 3 to 6 months late | 1 Mar 2028 to 31 May 2028 | £750 |
| More than 6 months late | From 1 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Feb 2028 | £200 |
| 3 months late | 28 May 2028 | another £200 |
| 6 months late | 28 Aug 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 13180911
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 February 2021 (5 years ago)
- Registered office
- Chantry House, 22 Upperton Road, Eastbourne, East Sussex, BN21 1BF
- Nature of business
- Other construction installation (SIC 43290)
Glazing (SIC 43342) - Year end
- 28 February (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 28 February 2026
- Last confirmation statement
- 3 February 2026
- Previous names
- C-Thru Windows & Doors Ltd (until 13 Feb 2023)
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Eastbourne
Other active installation companies (insulation, lifts, shutters and similar) registered in Eastbourne.
- Caigers Kitchen & Bathroom Installation Limited2019
- Catt Construction Ltd2024
- Corner Stone Installations Limited2025
- Devonshire Building Solutions Ltd2010
- Electron Installations Limited2006
- Future Displays Limited2025
- G and B Brickwork Limited2022
- GJB Construction Services Limited2018
All installation companies (insulation, lifts, shutters and similar) in Eastbourne · All trades in Eastbourne · Installers across the UK
Frequently asked questions
When are C-Thru Windows, Doors & Conservatories Ltd's accounts due?
C-Thru Windows, Doors & Conservatories Ltd's next accounts are due at Companies House by 30 November 2027 (in 413 days), covering the period to 28 February 2027.
When is C-Thru Windows, Doors & Conservatories Ltd's CT600 due?
The CT600 for the period to 28 February 2027 is due at HMRC by 28 February 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2027.
Is C-Thru Windows, Doors & Conservatories Ltd still trading?
C-Thru Windows, Doors & Conservatories 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 C-Thru Windows, Doors & Conservatories Ltd do?
C-Thru Windows, Doors & Conservatories Ltd is registered under Other construction installation (SIC 43290); Glazing (SIC 43342).
How old is C-Thru Windows, Doors & Conservatories Ltd?
C-Thru Windows, Doors & Conservatories Ltd was incorporated on 4 February 2021, 5 years ago.
Who runs C-Thru Windows, Doors & Conservatories Ltd?
C-Thru Windows, Doors & Conservatories Ltd has 2 active directors, the longest-serving appointed in Feb 2021. Their names and service addresses are on the Companies House register.
Who owns C-Thru Windows, Doors & Conservatories Ltd?
2 people or companies have significant control of C-Thru Windows, Doors & Conservatories Ltd: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if C-Thru Windows, Doors & Conservatories 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 C-Thru Windows, Doors & Conservatories 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.