- Company number
- NI651317
- Incorporated
- 27 Feb 20188 years trading
- Registered office
- 147B Saintfield RD, Saintfield Road, Lisburn, BT27 6UQ
- Nature of business
- Construction of domestic buildings; Roofing activities; Other specialised construction activities n.e.c.
S Knox Construction Services Limited is a 8-year-old private limited company registered in Lisburn, company number NI651317, one of 51 building contractors in Lisburn. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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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 up £5,815 (+15.2%) on the year before, to £44K.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £43K against £35K owed within a year: 1.2 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £44K | £43K | £35K | 2 | |
| 31 Jan 2024 | £38K | £8,088 | £24K | 2 | |
| 31 Jan 2023 | £47K | £16K | £18K | 2 | |
| 31 Jan 2022 | £40K | £25K | £14K | 2 | |
| 31 Jan 2021 | £33K | £39K | £32K | 1 |
Where S Knox Construction Services Limited is registered
The registered office is in Lisburn (BT27), in the Lisburn and Castlereagh local authority area, Northern Ireland. Show BT27 6UQ on a map.
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What happens if S Knox Construction Services 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- NI651317
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 February 2018 (8 years ago)
- Registered office
- 147B Saintfield RD, Saintfield Road, Lisburn, BT27 6UQ
- Nature of business
- Construction of domestic buildings (SIC 41202)
Roofing activities (SIC 43910)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 3 February 2026
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Lisburn
Other active building contractors registered in Lisburn.
- Segura Contracts Ltd2021
- Sloan Construction Ltd2024
- SM Construction 2010 Ltd2023
- SMC Developments Limited2023
- So Homes 2025 Ltd2024
- Tba Contracts Limited2012
- Three Homes Limited2019
- Tulnax Ltd2016
All building contractors in Lisburn · All trades in Lisburn · Builders across the UK
Frequently asked questions
When are S Knox Construction Services Limited's accounts due?
S Knox Construction Services Limited's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is S Knox Construction Services Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is S Knox Construction Services Limited still trading?
S Knox Construction Services 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 S Knox Construction Services Limited do?
S Knox Construction Services Limited is registered under Construction of domestic buildings (SIC 41202); Roofing activities (SIC 43910); Other specialised construction activities n.e.c. (SIC 43999).
How old is S Knox Construction Services Limited?
S Knox Construction Services Limited was incorporated on 27 February 2018, 8 years ago.
What is the penalty if S Knox Construction Services 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 S Knox Construction Services 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.