- Company number
- 10849875
- Incorporated
- 4 Jul 20179 years trading
- Registered office
- 70 ST. Marys Road, Watford, WD18 0EF
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Sonic Builders Limited is a 9-year-old private limited company registered in Watford, company number 10849875, one of 365 building 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 down £137K (-91.8%) on the year before, to £12K.
- Net assets rose in 5 of 8 year-on-year comparisons on record.
- Current assets of £80K against £11K owed within a year: 7.1 times cover.
- 4 employees on average, up from 3 the year before.
- Balance sheets on record for 9 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £12K | £80K | £11K | 4 | |
| 31 Mar 2024 | £149K | £55K | £0 | 3 | |
| 31 Mar 2023 | £158K | £78K | £412 | 3 | |
| 31 Mar 2022 | £91K | £63K | £27K | 1 | |
| 29 Jul 2021 | £32K | £2,308 | £11K | £2,430 | 1 |
| 30 Jul 2020 | £16K | £21K | £39K | £38K | 1 |
| 30 Jul 2019 | £10K | £149 | £16K | £17K | 2 |
| 31 Jul 2018 | £9,751 | £1,215 | £20K | £17K | |
| 30 Jul 2018 | £9,751 | £1,215 | £20K | £17K | 0 |
Where Sonic Builders Limited is registered
The registered office is in Watford (WD18), in the Watford local authority area, East of England. Show WD18 0EF on a map.
Other trade companies in WD18
- Aston Contractors LimitedInstallers
- Basky 613 LtdProperty developers
- M&E Motors LtdMotor traders
- Jeservicesgroup LtdBuilders
- RCK’S Car Wash Ltd LtdMechanics and garages
- S Buildx LtdBuilders
- CDP Mechanical Contracting LtdPlumbers and heating engineers
- Lane Commercial LtdCivil engineering
Also registered at this address
1 other company uses the same registered office as Sonic Builders Limited.
- Blue Rock Developers LtdProperty developers
What happens if Sonic Builders 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 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
- 10849875
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 July 2017 (9 years ago)
- Registered office
- 70 ST. Marys Road, Watford, WD18 0EF
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 3 July 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 Watford
Other active building contractors registered in Watford.
- Soraa Global Ltd2023
- Stalion Ltd2018
- Steel Mate Ltd2025
- Stephen Lawrence Limited2007
- Stewart Construction Solutions Limited2025
- Stolitsa Limited2024
- Stronghold Structures Limited2013
- Structural Services Ltd2026
All building contractors in Watford · All trades in Watford · Builders across the UK
Frequently asked questions
When are Sonic Builders Limited's accounts due?
Sonic Builders Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Sonic Builders Limited'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 Sonic Builders Limited still trading?
Sonic Builders Limited is listed as active on the Companies House register (checked 12 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 Builders Limited do?
Sonic Builders Limited is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Sonic Builders Limited?
Sonic Builders Limited was incorporated on 4 July 2017, 9 years ago.
What is the penalty if Sonic Builders 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 Builders Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.