- Company number
- 16820747
- Incorporated
- 30 Oct 2025
- Registered office
- First Floor, 10 College Road, Harrow, Middlesex, HA1 1BE
- Nature of business
- Glazing; Other specialised construction activities n.e.c.
JK Windows UK Ltd is a newly incorporated private limited company registered in Harrow, company number 16820747, one of 19 glazing companies in Harrow. Its next accounts are due at Companies House on 30 July 2027, and its first CT600 is due at HMRC on 29 October 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.
Is this your company?
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Where JK Windows UK Ltd is registered
The registered office is in Harrow (HA1), in the Harrow local authority area, London. Show HA1 1BE on a map.
Other trade companies in HA1
- Cabos Electrical LimitedElectricians
- Mia Maria Services LtdCleaning companies
- Ac Operations LtdScaffolders
- Verde Masters LtdLandscapers and gardeners
- Omega Works Group LtdLandscapers and gardeners
- Call 'Em LimitedPlumbers and heating engineers
- Swan Roofing Services LimitedRoofers
- DRV Property Solutions LtdPainters and decorators
Also registered at this address
2 other companies use the same registered office as JK Windows UK Ltd.
- RR Home Developments LimitedBuilders
- We Know Roofing LimitedRoofers
What happens if JK Windows UK 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 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 31 Jul 2027 to 30 Aug 2027 | £150 |
| 1 to 3 months late | 31 Aug 2027 to 30 Oct 2027 | £375 |
| 3 to 6 months late | 31 Oct 2027 to 30 Jan 2028 | £750 |
| More than 6 months late | From 31 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 16820747
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 October 2025
- Registered office
- First Floor, 10 College Road, Harrow, Middlesex, HA1 1BE
- Nature of business
- Glazing (SIC 43342)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 31 October (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 8 September 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 Harrow
Other active glazing companies registered in Harrow.
- Londonskylightglazing Ltd2026
- Londonskylightsandglazing Limited2026
- Magins Limited2012
- Rise Double Glazing Ltd2023
- Sash Windows UK Family Ltd2020
- Sleek Safe Secure Ltd2025
- The Window Centre (Harrow) Ltd1994
- Alpha13 Ltd2017
All glazing companies in Harrow · All trades in Harrow · Glaziers across the UK
Frequently asked questions
When are JK Windows UK Ltd's accounts due?
JK Windows UK Ltd's next accounts are due at Companies House by 30 July 2027 (in 290 days), covering the period to 31 October 2026.
When is JK Windows UK Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 29 October 2026, due by 29 October 2027, and one for the period to 31 October 2026, due by 31 October 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is JK Windows UK Ltd still trading?
JK Windows UK 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 JK Windows UK Ltd do?
JK Windows UK Ltd is registered under Glazing (SIC 43342); Other specialised construction activities n.e.c. (SIC 43999).
How old is JK Windows UK Ltd?
JK Windows UK Ltd was incorporated on 30 October 2025, less than a year ago.
What is the penalty if JK Windows UK 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 JK Windows UK 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.