- Companies
- Builders
- Welwyn Garden City
- Smart One Engineering Ltd
Smart One Engineering Ltd
- Company number
- 14924706
- Incorporated
- 8 Jun 20233 years trading
- Registered office
- 17 Bedwell Close, Welwyn Garden City, AL7 3XH
- Nature of business
- Construction of domestic buildings; Electrical installation; Other information technology service activities
Smart One Engineering Ltd is a 3-year-old private limited company registered in Welwyn Garden City, company number 14924706, one of 53 building contractors in Welwyn Garden City. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 down £384 (-2.5%) on the year before, to £15K.
- Current assets of £4,543 against £1,050 owed within a year: 4.3 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £15K | £1,123 | £4,543 | £1,050 | 0 |
| 30 Jun 2024 | £15K | £10K | £20K | £4,955 | -1 |
Where Smart One Engineering Ltd is registered
The registered office is in Welwyn Garden City (AL7), in the Welwyn Hatfield local authority area, East of England. Show AL7 3XH on a map.
Other trade companies in AL7
- Mechanicalwise LtdInstallers
- Azalea Services LimitedSpecialist contractors
- Malmech and Mannion LimitedMechanics and garages
- T&D Construction Group LtdFinishing trades
- Vertec Roofing and Building LtdRoofers
- Selectlane LtdMotor traders
- Af Pressure Washing LtdCleaning companies
- Jet Professional LtdCleaning companies
What happens if Smart One Engineering 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 31 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 14924706
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 June 2023 (3 years ago)
- Registered office
- 17 Bedwell Close, Welwyn Garden City, AL7 3XH
- Nature of business
- Construction of domestic buildings (SIC 41202)
Electrical installation (SIC 43210)
Other information technology service activities (SIC 62090) - Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 7 June 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 Welwyn Garden City
Other active building contractors registered in Welwyn Garden City.
- SRV Contractors Limited2024
- TK Home Improvements Limited2024
- Tom Harry Ltd2017
- VMS Building Ltd2022
- Welwyn Builders Ltd2026
- Wes One Limited2023
- Zimt Construction Ltd2026
- Ajb Property & Landscape Improvements Ltd2025
All building contractors in Welwyn Garden City · All trades in Welwyn Garden City · Builders across the UK
Frequently asked questions
When are Smart One Engineering Ltd's accounts due?
Smart One Engineering Ltd's next accounts are due at Companies House by 31 March 2027 (in 170 days), covering the period to 30 June 2026.
When is Smart One Engineering Ltd's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Smart One Engineering Ltd still trading?
Smart One Engineering 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 Smart One Engineering Ltd do?
Smart One Engineering Ltd is registered under Construction of domestic buildings (SIC 41202); Electrical installation (SIC 43210); Other information technology service activities (SIC 62090).
How old is Smart One Engineering Ltd?
Smart One Engineering Ltd was incorporated on 8 June 2023, 3 years ago.
What is the penalty if Smart One Engineering 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 Smart One Engineering 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.