- Company number
- 16434499
- Incorporated
- 7 May 20251 year trading
- Registered office
- 8 Riverside Business Park, Swansea Vale, Swansea, SA7 0AJ
- Nature of business
- Glazing; Other building completion and finishing
Coastline Windows Limited is a 1-year-old private limited company registered in Swansea, company number 16434499, one of 17 glazing companies in Swansea. Its next accounts are due at Companies House on 7 February 2027, and its first CT600 is due at HMRC on 6 May 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Coastline Windows Limited is registered
The registered office is in Swansea (SA7), in the Swansea local authority area, Wales. Show SA7 0AJ on a map.
Other trade companies in SA7
- Foundry & Co Construction LtdBuilders
- Pops Power Solutions LtdElectricians
- Perfect Roofing and Home Maintenance LimitedRoofers
- Eveo Engineering LtdElectricians
- Performance Bunker Liner LimitedSpecialist contractors
- Swan Roofing LimitedRoofers
- Air Conditioning & Heat Pumps LimitedPlumbers and heating engineers
- Ogm Pristine Cleaning LtdCleaning companies
Also registered at this address
2 other companies use the same registered office as Coastline Windows Limited.
- Elite Blasting Solutions LimitedCleaning companies
- Morstone Build Co LtdBuilders
What happens if Coastline Windows 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 7 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 8 Feb 2027 to 7 Mar 2027 | £150 |
| 1 to 3 months late | 8 Mar 2027 to 7 May 2027 | £375 |
| 3 to 6 months late | 8 May 2027 to 7 Aug 2027 | £750 |
| More than 6 months late | From 8 Aug 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
- 16434499
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 May 2025 (1 year ago)
- Registered office
- 8 Riverside Business Park, Swansea Vale, Swansea, SA7 0AJ
- Nature of business
- Glazing (SIC 43342)
Other building completion and finishing (SIC 43390) - Year end
- 31 May (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 6 May 2026
Filing notes for glazing companies
Glazing companies often take deposits before work starts. Deposits held at the year end are a liability, not income, until the job is done.
Similar companies in Swansea
Other active glazing companies registered in Swansea.
- Cymru Guardian Windows Limited2025
- Express Windows (South Wales) Ltd2023
- Glasshorizon Designs Ltd2023
- Hentons Home Improvements Ltd2012
- K Phillips Windows Ltd2016
- Morris Trade Frames Ltd2023
- Precise Glazing Limited2020
- PRG Windows Limited2019
All glazing companies in Swansea · All trades in Swansea · Glaziers across the UK
Frequently asked questions
When are Coastline Windows Limited's accounts due?
Coastline Windows Limited's next accounts are due at Companies House by 7 February 2027 (in 117 days), covering the period to 31 May 2026.
When is Coastline Windows Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 6 May 2026, due by 6 May 2027, and one for the period to 31 May 2026, due by 31 May 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Coastline Windows Limited still trading?
Coastline Windows 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 Coastline Windows Limited do?
Coastline Windows Limited is registered under Glazing (SIC 43342); Other building completion and finishing (SIC 43390).
How old is Coastline Windows Limited?
Coastline Windows Limited was incorporated on 7 May 2025, 1 year ago.
What is the penalty if Coastline Windows 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 Coastline Windows 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.