- Companies
- Specialist contractors
- Birmingham
- Knox Construction Ltd
Knox Construction Ltd
- Company number
- 11777939
- Incorporated
- 21 Jan 20197 years trading
- Registered office
- 371 Redditch Road, Birmingham, West Midlands, B38 8PR
- Nature of business
- Other specialised construction activities n.e.c.
Knox Construction Ltd is a 7-year-old private limited company registered in Birmingham, company number 11777939, one of 442 specialist construction companies in Birmingham. Its next accounts are due at Companies House on 2 January 2027, and the CT600 for the period to 2 April 2026 is due at HMRC on 2 April 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Knox Construction LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £1,083 (-2%) on the year before, to £53K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £57K against £4,837 owed within a year: more than 10 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 5 Apr 2025 | £53K | £57K | £4,837 | 1 | |
| 5 Apr 2024 | £55K | £62K | £7,957 | 1 | |
| 5 Apr 2023 | £38K | £45K | £7,115 | 1 | |
| 5 Apr 2022 | £70K | £76K | £5,350 | 1 | |
| 5 Apr 2021 | £55K | £72K | £8,154 | 0 | |
| 5 Apr 2020 | £18K | £26K | £8,386 |
Where Knox Construction Ltd is registered
The registered office is in Birmingham (B38), in the Birmingham local authority area, West Midlands. Show B38 8PR on a map.
Other trade companies in B38
- J.Colman Electrical LtdMachinery repair and installation
- Bearwood Roofing LtdRoofers
- Berdant Maintenance Group LtdFacilities management
- MHM Electrical & Maintenance LtdElectricians
- The Wire Guys LtdElectricians
- Macklin Precast Flooring LtdFloor and wall tilers
- JF Civils LtdCivil engineering
- Smartwall Solutions LtdPainters and decorators
What happens if Knox Construction 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 2 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 3 Jan 2027 to 2 Feb 2027 | £150 |
| 1 to 3 months late | 3 Feb 2027 to 2 Apr 2027 | £375 |
| 3 to 6 months late | 3 Apr 2027 to 2 Jul 2027 | £750 |
| More than 6 months late | From 3 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 3 Apr 2027 | £200 |
| 3 months late | 2 Jul 2027 | another £200 |
| 6 months late | 2 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 2 Apr 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
- 11777939
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 January 2019 (7 years ago)
- Registered office
- 371 Redditch Road, Birmingham, West Midlands, B38 8PR
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 2 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 5 April 2025
- Last confirmation statement
- 20 January 2026
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 Birmingham
Other active specialist construction companies registered in Birmingham.
- Kokson & Co (UK) Limited2014
- Kular Builders Ltd2023
- Labour Connects Ltd2020
- Lark & Larks Ltd2003
- Las V & Co Ltd2024
- Latifi Ltd2024
- Limestones Construction Group Ltd2026
- Lion Group (Events) Ltd2025
All specialist construction companies in Birmingham · All trades in Birmingham · Specialist contractors across the UK
Frequently asked questions
When are Knox Construction Ltd's accounts due?
Knox Construction Ltd's next accounts are due at Companies House by 2 January 2027 (in 82 days), covering the period to 2 April 2026.
When is Knox Construction Ltd's CT600 due?
The CT600 for the period to 2 April 2026 is due at HMRC by 2 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 3 January 2027.
Is Knox Construction Ltd still trading?
Knox Construction 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 Knox Construction Ltd do?
Knox Construction Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Knox Construction Ltd?
Knox Construction Ltd was incorporated on 21 January 2019, 7 years ago.
What is the penalty if Knox Construction 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 Knox Construction 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.