- Companies
- Specialist contractors
- Glasgow
- S1 Construction Ltd
S1 Construction Ltd
- Company number
- SC482927
- Incorporated
- 25 Jul 201412 years trading
- Registered office
- 5 Bonnyholm Ave, Glasgow, G53 5RL
- Nature of business
- Other specialised construction activities n.e.c.
S1 Construction Ltd is a 12-year-old private limited company registered in Glasgow, company number SC482927, one of 522 specialist construction companies in Glasgow. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £47K (+9.3%) on the year before, to £552K.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £449K against £82K owed within a year: 5.5 times cover.
- 2 employees on average, down from 4 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £552K | £422K | £449K | £82K | 2 |
| 30 Sep 2024 | £505K | £434K | £436K | £100K | 4 |
| 30 Sep 2023 | £365K | £416K | £432K | £82K | 4 |
| 30 Sep 2022 | £304K | £328K | £388K | £61K | 6 |
| 30 Sep 2021 | £227K | £154K | £304K | £37K | 9 |
| 30 Sep 2020 | £226K | £249K | £379K | £110K | 10 |
| 30 Sep 2019 | £133K | £103K | £184K | £52K | |
| 30 Sep 2018 | £76K | £21K | £103K | £31K | |
| 30 Sep 2017 | £27K | £28K | £83K | £34K | |
| 30 Sep 2016 | £23K | £37K | £93K | £23K |
Where S1 Construction Ltd is registered
The registered office is in Glasgow (G53), in the Glasgow City local authority area, Scotland. Show G53 5RL on a map.
Other trade companies in G53
- SK1 Electrical LtdElectricians
- Elitewheel Motors LtdMechanics and garages
- Techno Cold LtdPlumbers and heating engineers
- Cab Direct 4U LtdMotor traders
- Scotivo LtdCleaning companies
- International Construction Consultants LtdScaffolders
- MM Aviation Services LtdMachinery repair and installation
- Jordyn Donlin LtdElectricians
What happens if S1 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- SC482927
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 July 2014 (12 years ago)
- Registered office
- 5 Bonnyholm Ave, Glasgow, G53 5RL
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 23 December 2025
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 Glasgow
Other active specialist construction companies registered in Glasgow.
- Sanderson Fire and Security Ltd2026
- Scaffolding and Access Supplies Ltd2016
- Scotia Grouting Ltd2026
- Scotsman Construction Consultancy Ltd2022
- Scotweed Ltd2020
- SDM Property Assistance Ltd2001
- SDW Management Limited2018
- Seaforth Energy Services Ltd2024
All specialist construction companies in Glasgow · All trades in Glasgow · Specialist contractors across the UK
Frequently asked questions
When are S1 Construction Ltd's accounts due?
S1 Construction Ltd's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is S1 Construction Ltd's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is S1 Construction Ltd still trading?
S1 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 S1 Construction Ltd do?
S1 Construction Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is S1 Construction Ltd?
S1 Construction Ltd was incorporated on 25 July 2014, 12 years ago.
What is the penalty if S1 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 S1 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.