- Companies
- Specialist contractors
- Bristol
- Lab-Sea-Systems Ltd
Lab-Sea-Systems Ltd
- Company number
- 11211233
- Incorporated
- 19 Feb 20188 years trading
- Registered office
- The Bristol Office 2ND Floor, 5 High Street, Westbury on Trym, Bristol, BS9 3BY
- Nature of business
- Other specialised construction activities n.e.c.; Engineering related scientific and technical consulting activities; Other service activities n.e.c.
Lab-Sea-Systems Ltd is a 8-year-old private limited company registered in Bristol, company number 11211233, one of 442 specialist construction companies in Bristol. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 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 £2,315 (-5.3%) on the year before, to -£46K.
- Net assets rose in 1 of 6 year-on-year comparisons on record.
- 1 employee on average during the year.
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | -£46K | £3,867 | £0 | 1 | |
| 30 Apr 2024 | -£43K | £7,250 | £0 | 1 | |
| 30 Apr 2023 | -£43K | £5,387 | £466 | 1 | |
| 30 Apr 2022 | -£30K | £16K | £166 | 2 | |
| 30 Apr 2021 | -£19K | £19K | £1,526 | 2 | |
| 30 Apr 2020 | £12K | £12K | £0 | 2 | |
| 30 Apr 2019 | £4,000 | £4,000 | £0 |
Where Lab-Sea-Systems Ltd is registered
The registered office is in Bristol (BS9), in the Bristol, City of local authority area, South West. Show BS9 3BY on a map.
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- Nido Design & Build LtdBuilders
- Eb Maintenance LimitedSpecialist contractors
- West Country Auto Tech LtdMachinery repair and installation
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Also registered at this address
19 other companies use the same registered office as Lab-Sea-Systems Ltd.
- 1ST 4 Electrical Services LtdElectricians
- Ad Ascent Developments LtdProperty developers
- Alan's Bicycle Workshop LtdMachinery repair and installation
- Ample Electrical LtdElectricians
- Conclave Consulting LtdRepair services
- CRP Design LtdBuilders
- Dovedale Homes LimitedProperty developers
- Ecoore LtdProperty developers
- Encura LtdMachinery repair and installation
- Facility Complete Services LtdFacilities management
- Ikaya Construction LtdProperty developers
- Jointek LtdProperty developers
- Mobile Surface Restoration LtdCleaning companies
- Nick Lundy Draughting Services LimitedJoiners and carpenters
- Odrone LtdCleaning companies
- Quantum Construction Consultants LtdSpecialist contractors
- R A Motor Store LtdMotor traders
- The Knowledgeable Frenchman LtdMechanics and garages
- Yarrow Services LtdFacilities management
What happens if Lab-Sea-Systems 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 11211233
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 February 2018 (8 years ago)
- Registered office
- The Bristol Office 2ND Floor, 5 High Street, Westbury on Trym, Bristol, BS9 3BY
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
Engineering related scientific and technical consulting activities (SIC 71122)
Other service activities n.e.c. (SIC 96090) - Year end
- 30 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 17 April 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 Bristol
Other active specialist construction companies registered in Bristol.
- Lane Building Contractors Ltd2026
- Lap Diamond Drilling Ltd2025
- Lay of Land Limited2019
- LB Brickwork & Construction Ltd2026
- LD Commercial Movers Ltd2020
- Lda Carpentry and Construction Ltd2024
- Lee Currie Services Limited2016
- Legacy Contracts Ltd2025
All specialist construction companies in Bristol · All trades in Bristol · Specialist contractors across the UK
Frequently asked questions
When are Lab-Sea-Systems Ltd's accounts due?
Lab-Sea-Systems Ltd's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is Lab-Sea-Systems Ltd's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Lab-Sea-Systems Ltd still trading?
Lab-Sea-Systems 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 Lab-Sea-Systems Ltd do?
Lab-Sea-Systems Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999); Engineering related scientific and technical consulting activities (SIC 71122); Other service activities n.e.c. (SIC 96090).
How old is Lab-Sea-Systems Ltd?
Lab-Sea-Systems Ltd was incorporated on 19 February 2018, 8 years ago.
What is the penalty if Lab-Sea-Systems 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 Lab-Sea-Systems 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.