- Companies
- Installers
- Porth
- GLK Groundworks Limited
GLK Groundworks Limited
- Company number
- 11735560
- Incorporated
- 19 Dec 20187 years trading
- Registered office
- 4 Heol Y Glyn, Tonyrefail, Porth, CF39 8LL
- Nature of business
- Other construction installation
GLK Groundworks Limited is a 7-year-old private limited company registered in Porth, company number 11735560, one of 8 installation companies (insulation, lifts, shutters and similar) in Porth. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where GLK Groundworks Limited is registered
The registered office is in Porth (CF39), in the Rhondda Cynon Taf local authority area, Wales. Show CF39 8LL on a map.
Other trade companies in CF39
- Nvme Detailing LimitedMechanics and garages
- Choctar LimitedBuilders
- J Cantwell Surfacing & Contracting LtdCivil engineering
- Ok Rail LtdCivil engineering
- Porth Ceilings & Interiors LtdFinishing trades
- Wydex LtdBuilders
- Time Lec Services LtdElectricians
- Arb-Scape Tree Surgery & Landscaping LtdLandscapers and gardeners
What happens if GLK Groundworks 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 11735560
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 December 2018 (7 years ago)
- Registered office
- 4 Heol Y Glyn, Tonyrefail, Porth, CF39 8LL
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 29 November 2025
- Previous names
- GDLK Limited (until 11 Feb 2019)
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 Porth
Other active installation companies (insulation, lifts, shutters and similar) registered in Porth.
- LBR Groundworks Ltd2025
- N.M Services (South Wales) Ltd2020
- T & H Interiors Limited2011
- Thornes Kitchen Installations Ltd2026
- Vertice Services Limited2025
- Dreamscape Construction & Design Ltd2021
- G L Thomas Construction Ltd2016
All installation companies (insulation, lifts, shutters and similar) in Porth · All trades in Porth · Installers across the UK
Frequently asked questions
When are GLK Groundworks Limited's accounts due?
GLK Groundworks Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is GLK Groundworks 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 31 December 2025, due by 31 December 2026, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is GLK Groundworks Limited still trading?
GLK Groundworks 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 GLK Groundworks Limited do?
GLK Groundworks Limited is registered under Other construction installation (SIC 43290).
How old is GLK Groundworks Limited?
GLK Groundworks Limited was incorporated on 19 December 2018, 7 years ago.
What is the penalty if GLK Groundworks 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 GLK Groundworks 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.