- Companies
- Specialist contractors
- Harlow
- London Sealant Services Limited
London Sealant Services Limited
- Company number
- 10580819
- Incorporated
- 24 Jan 20179 years trading
- Registered office
- O-I Building First Floor, the West Wing, Edinburgh Way, Harlow, Essex, CM20 2DB
- Nature of business
- Other specialised construction activities n.e.c.
London Sealant Services Limited is a 9-year-old private limited company registered in Harlow, company number 10580819, one of 116 specialist construction companies in Harlow. 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.
Is this your company?
File the 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 London Sealant Services LimitedOr 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.
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 £1,563 (+454.4%) on the year before, to £1,907.
- Net assets rose in 3 of 7 year-on-year comparisons on record.
- Current assets of £145K against £97K owed within a year: 1.5 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £1,907 | £145K | £97K | 1 | |
| 31 Mar 2024 | £344 | £163K | £112K | 1 | |
| 31 Mar 2023 | £404 | £169K | £115K | 1 | |
| 31 Mar 2022 | £1,569 | £125K | £71K | 1 | |
| 31 Mar 2021 | -£7,759 | £112K | £69K | 1 | |
| 31 Mar 2020 | £191 | £61K | £58K | 2 | |
| 31 Mar 2019 | £79 | £47K | £43K | 2 | |
| 31 Jan 2018 | £11K | £44K | £30K | 2 |
Where London Sealant Services Limited is registered
The registered office is in Harlow (CM20), in the Harlow local authority area, East of England. Show CM20 2DB on a map.
Other trade companies in CM20
- Alpha Security, Auto Care and Facilities Maintenance LtdMechanics and garages
- VLD Partners LtdProperty developers
- Ata Pro LtdBuilders
- TLK Cons LtdSpecialist contractors
- Cavity Drain Pumps ( CDP ) LtdInstallers
- United Auto Solutions LtdMechanics and garages
- Ace Consolidate LimitedFinishing trades
- Wersatis & Global Parts LtdMotor traders
Shared registered office
46 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if London Sealant Services 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
- 10580819
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 January 2017 (9 years ago)
- Registered office
- O-I Building First Floor, the West Wing, Edinburgh Way, Harlow, Essex, CM20 2DB
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 23 February 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 Harlow
Other active specialist construction companies registered in Harlow.
- M&Y Construction Ltd2016
- Mack Building Services Ltd2016
- Mara Tim Ltd2015
- Martin Iliev Ltd2017
- MB Membranes Limited2015
- Mena London Ltd2026
- Metwin Limited1958
- Mihaloiu Slip Form Ltd2015
All specialist construction companies in Harlow · All trades in Harlow · Specialist contractors across the UK
Frequently asked questions
When are London Sealant Services Limited's accounts due?
London Sealant Services Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is London Sealant Services 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 London Sealant Services Limited still trading?
London Sealant Services 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 London Sealant Services Limited do?
London Sealant Services Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is London Sealant Services Limited?
London Sealant Services Limited was incorporated on 24 January 2017, 9 years ago.
What is the penalty if London Sealant Services 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 London Sealant Services 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.