- Companies
- Civil engineering
- Underline Utilities & Civil Engineering Ltd
Underline Utilities & Civil Engineering Ltd
- Company number
- 15212825
- Incorporated
- 16 Oct 20232 years trading
- Registered office
- Athene House, Suite J, 86, The Broadway, Mill Hill, London, NW7 3TD
- Nature of business
- Construction of utility projects for electricity and telecommunications; Construction of other civil engineering projects n.e.c.
Underline Utilities & Civil Engineering Ltd is a 2-year-old private limited company registered in Mill Hill, company number 15212825, one of the UK's civil engineering contractors. Its next accounts are due at Companies House on 31 October 2026, and its first CT600 is due at HMRC on 31 October 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where Underline Utilities & Civil Engineering Ltd is registered
The registered office is in Mill Hill (NW7), in the Barnet local authority area, London. Show NW7 3TD on a map.
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Also registered at this address
2 other companies use the same registered office as Underline Utilities & Civil Engineering Ltd.
- Strata Flow LimitedPlumbers and heating engineers
- The Phoenix Solar Installers LimitedSpecialist contractors
What happens if Underline Utilities & Civil 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 15212825
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 October 2023 (2 years ago)
- Registered office
- Athene House, Suite J, 86, The Broadway, Mill Hill, London, NW7 3TD
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Construction of other civil engineering projects n.e.c. (SIC 42990) - Year end
- 30 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2024
- Last confirmation statement
- 25 October 2025
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
Other active civil engineering contractors.
Frequently asked questions
When are Underline Utilities & Civil Engineering Ltd's accounts due?
Underline Utilities & Civil Engineering Ltd's next accounts are due at Companies House by 31 October 2026 (in 17 days), covering the period to 31 January 2026.
When is Underline Utilities & Civil Engineering Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 October 2025, due by 31 October 2026, and one for the period to 31 January 2026, due by 31 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Underline Utilities & Civil Engineering Ltd still trading?
Underline Utilities & Civil 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 Underline Utilities & Civil Engineering Ltd do?
Underline Utilities & Civil Engineering Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Underline Utilities & Civil Engineering Ltd?
Underline Utilities & Civil Engineering Ltd was incorporated on 16 October 2023, 2 years ago.
What is the penalty if Underline Utilities & Civil 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 Underline Utilities & Civil 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.