- Companies
- Civil engineering
- Kilmarnock
- William Smith Engineering Limited
William Smith Engineering Limited
- Company number
- SC692613
- Incorporated
- 17 Mar 20215 years trading
- Registered office
- Bottoms Farm, Stewarton, Kilmarnock, KA3 3ED
- Nature of business
- Construction of other civil engineering projects n.e.c.
William Smith Engineering Limited is a 5-year-old private limited company registered in Kilmarnock, company number SC692613, one of 50 civil engineering contractors in Kilmarnock. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 £14K (+6.4%) on the year before, to £233K.
- Net assets rose in 2 of 3 year-on-year comparisons on record.
- Current assets of £404K against £174K owed within a year: 2.3 times cover.
- 10 employees on average, up from 9 the year before.
- Balance sheets on record for 4 years, 2022 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £233K | £25K | £404K | £174K | 10 |
| 31 Mar 2024 | £219K | £408K | £180K | 9 | |
| 31 Mar 2023 | £346K | £72K | £655K | £311K | 13 |
| 31 Mar 2022 | £183K | £16K | £639K | £459K | 12 |
Where William Smith Engineering Limited is registered
The registered office is in Kilmarnock (KA3), in the East Ayrshire local authority area, Scotland. Show KA3 3ED on a map.
Other trade companies in KA3
- Kobe Construct LtdBuilders
- Abw Fencing LtdInstallers
- Marlie Construction Contractors LtdSpecialist contractors
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- Vip Car Wash LimitedCleaning companies
- Elite Roofing and Rendering Ltd LtdRoofers
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What happens if William Smith Engineering 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- SC692613
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 March 2021 (5 years ago)
- Registered office
- Bottoms Farm, Stewarton, Kilmarnock, KA3 3ED
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 16 March 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Kilmarnock
Other active civil engineering contractors registered in Kilmarnock.
- WK Contracts Limited2015
- Wreckansignalling Ltd2025
- Young Civils and Fencing Ltd2025
- A and H Dick Limited2014
- Adaptive Construction Ltd2018
- Ailsa Water Design Consultancy Limited2015
- Am Rail Contracts Ltd2023
- Anderson Energy Services Ltd2025
All civil engineering contractors in Kilmarnock · All trades in Kilmarnock · Civil engineering across the UK
Frequently asked questions
When are William Smith Engineering Limited's accounts due?
William Smith Engineering Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is William Smith Engineering Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is William Smith Engineering Limited still trading?
William Smith Engineering 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 William Smith Engineering Limited do?
William Smith Engineering Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is William Smith Engineering Limited?
William Smith Engineering Limited was incorporated on 17 March 2021, 5 years ago.
What is the penalty if William Smith Engineering 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 William Smith Engineering 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.