- Companies
- Specialist contractors
- London
- Jtmason Ltd
Jtmason Ltd
- Company number
- 16974203
- Incorporated
- 20 Jan 2026
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Other specialised construction activities n.e.c.
Jtmason Ltd is a newly incorporated private limited company registered in London, company number 16974203, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 20 October 2027, and its first CT600 is due at HMRC on 19 January 2028.
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 Jtmason Ltd is registered
The registered office is in London (N1), in the Hackney local authority area, London. Show N1 7GU on a map.
Other trade companies in N1
- Tagwise LtdSpecialist contractors
- Sphere Aviation Solutions UK LtdMachinery repair and installation
- Get IT Done Builders LtdJoiners and carpenters
- Evolution Products LimitedMotor traders
- Fleetstone Trading LtdMotor traders
- Kenneth Brady LtdElectricians
- UK Import Export LtdBuilders
- Magic Door Services LimitedMachinery repair and installation
Shared registered office
1,583 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 Jtmason 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 20 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 21 Oct 2027 to 20 Nov 2027 | £150 |
| 1 to 3 months late | 21 Nov 2027 to 20 Jan 2028 | £375 |
| 3 to 6 months late | 21 Jan 2028 to 20 Apr 2028 | £750 |
| More than 6 months late | From 21 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 16974203
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 January 2026
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in London
Other active specialist construction companies registered in London.
- Jude Collins Ltd2015
- Jurby Limited2024
- Just Crew Ltd2024
- Just Skip IT Ltd2016
- Justin & Co Ltd2021
- JW Landscaping Ltd2022
- Jy Demolition Services Ltd2025
- K & F Services Ltd2020
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Jtmason Ltd's accounts due?
Jtmason Ltd's next accounts are due at Companies House by 20 October 2027 (in 372 days), covering the period to 31 January 2027.
When is Jtmason 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 19 January 2027, due by 19 January 2028, and one for the period to 31 January 2027, due by 31 January 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Jtmason Ltd still trading?
Jtmason 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 Jtmason Ltd do?
Jtmason Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Jtmason Ltd?
Jtmason Ltd was incorporated on 20 January 2026, less than a year ago.
What is the penalty if Jtmason 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 Jtmason 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.