- Companies
- Specialist contractors
- Southend-on-Sea
- SQ1 Groundworks Ltd
SQ1 Groundworks Ltd
- Company number
- 16617748
- Incorporated
- 30 Jul 20251 year trading
- Registered office
- Seedbed Business Centre Vanguard Way, Shoeburyness, Southend-on-Sea, SS3 9QY
- Nature of business
- Other specialised construction activities n.e.c.
SQ1 Groundworks Ltd is a 1-year-old private limited company registered in Southend-on-Sea, company number 16617748, one of 57 specialist construction companies in Southend-on-Sea. Its next accounts are due at Companies House on 30 April 2027, and its first CT600 is due at HMRC on 29 July 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
File the first accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for SQ1 Groundworks LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Where SQ1 Groundworks Ltd is registered
The registered office is in Southend-on-Sea (SS3), in the Southend-on-Sea local authority area, East of England. Show SS3 9QY on a map.
Other trade companies in SS3
- Truck Components LtdMotor traders
- S1 Automotive Group LtdMechanics and garages
- MKF Cleaning LtdCleaning companies
- Tranquil Solutions LimitedElectricians
- Nord Air Conditioning LtdPlumbers and heating engineers
- Noco Group LtdCivil engineering
- Garrison Gardens LtdLandscapers and gardeners
- Freddaf Investments LimitedProperty developers
Also registered at this address
5 other companies use the same registered office as SQ1 Groundworks Ltd.
- SGT Building Services LimitedPainters and decorators
- SQ1 Decorating LtdPainters and decorators
- SQ1 Projects LtdBuilders
- Swe Electrical Contractors LimitedElectricians
- Tempfencing 24/7 LtdInstallers
What happens if SQ1 Groundworks 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 30 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 16617748
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 July 2025 (1 year ago)
- Registered office
- Seedbed Business Centre Vanguard Way, Shoeburyness, Southend-on-Sea, SS3 9QY
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 29 July 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Southend-on-Sea
Other active specialist construction companies registered in Southend-on-Sea.
- Tihson Builders Ltd2023
- Trebor Restorations Ltd2011
- Triple Shield Compliance Ltd2026
- Ads Groundworks Ltd2009
- Advanced Building Facilities Limited2007
- Aswara Construction Ltd2019
- B-Secure Locksmiths Ltd2006
- Birkys Limited2026
All specialist construction companies in Southend-on-Sea · All trades in Southend-on-Sea · Specialist contractors across the UK
Frequently asked questions
When are SQ1 Groundworks Ltd's accounts due?
SQ1 Groundworks Ltd's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 31 July 2026.
When is SQ1 Groundworks 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 29 July 2026, due by 29 July 2027, and one for the period to 31 July 2026, due by 31 July 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is SQ1 Groundworks Ltd still trading?
SQ1 Groundworks 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 SQ1 Groundworks Ltd do?
SQ1 Groundworks Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is SQ1 Groundworks Ltd?
SQ1 Groundworks Ltd was incorporated on 30 July 2025, 1 year ago.
What is the penalty if SQ1 Groundworks 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 SQ1 Groundworks 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.