- Companies
- Civil engineering
- Sevenoaks
- Sonic Limited
Sonic Limited
- Company number
- 03581912
- Incorporated
- 16 Jun 199828 years trading
- Registered office
- The Haven 155 Knatts Valley Road, West Kingsdown, Sevenoaks, Kent, TN15 6XY
- Nature of business
- Construction of other civil engineering projects n.e.c.; Combined facilities support activities
Sonic Limited is a 28-year-old private limited company registered in Sevenoaks, company number 03581912, one of 24 civil engineering contractors in Sevenoaks. 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 up £42K (+121.9%) on the year before, to £7,594.
- Net assets rose in 5 of 8 year-on-year comparisons on record.
- Current assets of £166K against £93K owed within a year: 1.8 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £7,594 | £166K | £93K | 3 | |
| 30 Jun 2024 | -£35K | £88K | £71K | 3 | |
| 30 Jun 2023 | £12K | £77K | £68K | 3 | |
| 30 Jun 2022 | £34K | £75K | £56K | 4 | |
| 30 Jun 2021 | £32K | £51K | £29K | 5 | |
| 30 Jun 2020 | £23K | £102K | £49K | 5 | |
| 30 Jun 2019 | -£1,914 | £327 | £2,241 | ||
| 30 Jun 2018 | -£2,043 | £198 | £2,241 | ||
| 30 Jun 2017 | -£1,901 | £190 | £2,091 |
Where Sonic Limited is registered
The registered office is in Sevenoaks (TN15), in the Sevenoaks local authority area, South East. Show TN15 6XY on a map.
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What happens if Sonic 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 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
- 03581912
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 June 1998 (28 years ago)
- Registered office
- The Haven 155 Knatts Valley Road, West Kingsdown, Sevenoaks, Kent, TN15 6XY
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
Combined facilities support activities (SIC 81100) - Year end
- 30 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 24 September 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 Sevenoaks
Other active civil engineering contractors registered in Sevenoaks.
- Superspeed Design Consultants Ltd2025
- Tech Environment UK Ltd2018
- Texo Rail Ltd2025
- Wha Ltd2016
- Ace Contractors Ltd2010
- Action Rail Southeast Ltd2026
- Brimbo Qa/QC Consultants Ltd.2013
- Cable Location Services Limited2003
All civil engineering contractors in Sevenoaks · All trades in Sevenoaks · Civil engineering across the UK
Frequently asked questions
When are Sonic Limited's accounts due?
Sonic Limited's next accounts are due at Companies House by 31 March 2027 (in 170 days), covering the period to 30 June 2026.
When is Sonic Limited'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 Sonic Limited still trading?
Sonic 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 Sonic Limited do?
Sonic Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990); Combined facilities support activities (SIC 81100).
How old is Sonic Limited?
Sonic Limited was incorporated on 16 June 1998, 28 years ago.
What is the penalty if Sonic 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 Sonic 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.