- Companies
- Civil engineering
- Harrow
- 1ST Solo Ductwork Services Limited
1ST Solo Ductwork Services Limited
- Company number
- 04005856
- Incorporated
- 1 Jun 200026 years trading
- Registered office
- Unit 3 Bradburys Court Bradburys Court, Lyon Road, Harrow, Greater London, HA1 2BY
- Nature of business
- Construction of other civil engineering projects n.e.c.
1ST Solo Ductwork Services Limited is a 26-year-old private limited company registered in Harrow, company number 04005856, one of 121 civil engineering contractors in Harrow. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £15K on the year before, to £17K.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £60K against £51K owed within a year: 1.2 times cover.
- 3 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 |
|---|---|---|---|---|---|
| 31 May 2025 | £17K | £15K | £60K | £51K | 3 |
| 31 May 2024 | £1,296 | -£11K | £43K | £49K | 4 |
| 31 May 2023 | £20K | £61 | £74K | £63K | 5 |
| 31 May 2022 | £44K | -£27K | £108K | £78K | 5 |
| 31 May 2021 | £68K | £43K | £122K | £69K | 5 |
| 31 May 2020 | £44K | £22K | £78K | £53K | 5 |
| 31 May 2019 | £27K | £10K | £85K | £84K | |
| 31 May 2018 | £34K | £210 | £83K | £84K | 3 |
| 31 May 2017 | £27K | £3,251 | £79K | £60K | 3 |
| 31 May 2016 | £30K | £17K | £91K | £71K |
Where 1ST Solo Ductwork Services Limited is registered
The registered office is in Harrow (HA1), in the Harrow local authority area, London. Show HA1 2BY on a map.
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- Omega Works Group LtdLandscapers and gardeners
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- DRV Property Solutions LtdPainters and decorators
What happens if 1ST Solo Ductwork 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 04005856
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 June 2000 (26 years ago)
- Registered office
- Unit 3 Bradburys Court Bradburys Court, Lyon Road, Harrow, Greater London, HA1 2BY
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 7 May 2026
- Charges (mortgages)
- 2 outstanding of 2 registered
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 Harrow
Other active civil engineering contractors registered in Harrow.
- 24 Seven Civil Engineering Ltd2019
- 4A Commercial Management Consultants Limited2019
- Aade Limited2018
- Aalp Ltd2019
- Aarthy Construction Ltd2016
- Above & Beyond TM Ltd2025
- Abr Construction Services Limited2024
- Abt Resourcing Limited2017
All civil engineering contractors in Harrow · All trades in Harrow · Civil engineering across the UK
Frequently asked questions
When are 1ST Solo Ductwork Services Limited's accounts due?
1ST Solo Ductwork Services Limited's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is 1ST Solo Ductwork Services Limited's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is 1ST Solo Ductwork Services Limited still trading?
1ST Solo Ductwork 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 1ST Solo Ductwork Services Limited do?
1ST Solo Ductwork Services Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is 1ST Solo Ductwork Services Limited?
1ST Solo Ductwork Services Limited was incorporated on 1 June 2000, 26 years ago.
What is the penalty if 1ST Solo Ductwork 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 1ST Solo Ductwork 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.