- Companies
- Civil engineering
- Watford
- Adi Installation Ltd
Adi Installation Ltd
- Company number
- 11902424
- Incorporated
- 23 Mar 20197 years trading
- Registered office
- 26 Station Road, Watford, WD17 1JU
- Nature of business
- Construction of other civil engineering projects n.e.c.
Adi Installation Ltd is a 7-year-old private limited company registered in Watford, company number 11902424, one of 77 civil engineering contractors in Watford. 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 £931K (+597.3%) on the year before, to £1.1M.
- Net assets rose in 5 of 5 year-on-year comparisons on record.
- Current assets of £2.3M against £1.2M owed within a year: 1.9 times cover.
- 2 employees on average, down from 8 the year before.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £1.1M | £635K | £2.3M | £1.2M | 2 |
| 31 Mar 2024 | £156K | £385K | £437K | 8 | |
| 31 Mar 2023 | £89K | £431 | £157K | 5 | |
| 31 Mar 2022 | £30K | £69K | £42K | 3 | |
| 31 Mar 2021 | £165 | £46K | £50K | 4 | |
| 31 Mar 2020 | £21 | £10K | £15K | 1 |
Where Adi Installation Ltd is registered
The registered office is in Watford (WD17), in the Watford local authority area, East of England. Show WD17 1JU on a map.
Other trade companies in WD17
- Ramauto LimitedMotor traders
- A1 Motors Watford LtdMechanics and garages
- Kola Brickwork LtdInstallers
- Appleby's Mechanical Services LtdPlumbers and heating engineers
- Kpu Services LtdProperty developers
- Highmark Investments LtdBuilders
- Boriama Private Office LimitedCleaning companies
- Oldsy Install LtdInstallers
Shared registered office
29 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Adi Installation 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 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
- 11902424
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 March 2019 (7 years ago)
- Registered office
- 26 Station Road, Watford, WD17 1JU
- 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
- 22 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 Watford
Other active civil engineering contractors registered in Watford.
- Agu.Ud-Uchechukwuservices Ltd2017
- Arizona Sky Limited2023
- As London Construction Ltd2026
- Bma Rail Limited2016
- Bonwin Construction Ltd2022
- C&A Civils Ltd2022
- Cabletech Solutions Limited2024
- Calin MGS Ltd2020
All civil engineering contractors in Watford · All trades in Watford · Civil engineering across the UK
Frequently asked questions
When are Adi Installation Ltd's accounts due?
Adi Installation Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Adi Installation Ltd'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 Adi Installation Ltd still trading?
Adi Installation 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 Adi Installation Ltd do?
Adi Installation Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Adi Installation Ltd?
Adi Installation Ltd was incorporated on 23 March 2019, 7 years ago.
What is the penalty if Adi Installation 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 Adi Installation 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.