- Companies
- Installers
- Upminster
- South East Mastclimbers Ltd
South East Mastclimbers Ltd
- Company number
- 13926191
- Incorporated
- 18 Feb 20224 years trading
- Registered office
- Unit 18 Little Malgraves Industrial Estate, Lower Dunton Road, Upminster, Essex, RM14 3TE
- Nature of business
- Other construction installation
South East Mastclimbers Ltd is a 4-year-old private limited company registered in Upminster, company number 13926191, one of 28 installation companies (insulation, lifts, shutters and similar) in Upminster. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 unchanged on the year before, at -£36K.
- Current assets of £12K against £2,076 owed within a year: 5.9 times cover.
- 1 employee on average, down from 2 the year before.
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | -£36K | £482 | £12K | £2,076 | 1 |
| 29 Feb 2024 | -£36K | £482 | £12K | £2,076 | 2 |
| 28 Feb 2023 | -£2,643 | £100 | £66K | £68K | 2 |
Where South East Mastclimbers Ltd is registered
The registered office is in Upminster (RM14), in the Thurrock local authority area, East of England. Show RM14 3TE on a map.
Other trade companies in RM14
- Bobofresh LtdCleaning companies
- HTS Construction LtdBuilders
- We Fix Energy LtdCivil engineering
- ZH Services LtdBuilders
- Ragasan LimitedBuilders
- Your Serve LtdCleaning companies
- LC Engineering LtdMachinery repair and installation
- Caat Interiors LtdInstallers
Shared registered office
58 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 South East Mastclimbers 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 13926191
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 February 2022 (4 years ago)
- Registered office
- Unit 18 Little Malgraves Industrial Estate, Lower Dunton Road, Upminster, Essex, RM14 3TE
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 17 February 2026
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Upminster
Other active installation companies (insulation, lifts, shutters and similar) registered in Upminster.
- Superior Shutters Limited2025
- Workspace Creations Ltd2021
- Ajk Builders and Property Maintenance Limited2012
- Bluestone B.M.S. Solutions Ltd2017
- Caat Interiors Ltd2026
- Custom Sight and Sound Ltd2002
- DB City Solutions Ltd2026
- DSL Highway Services Ltd2021
All installation companies (insulation, lifts, shutters and similar) in Upminster · All trades in Upminster · Installers across the UK
Frequently asked questions
When are South East Mastclimbers Ltd's accounts due?
South East Mastclimbers Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is South East Mastclimbers Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is South East Mastclimbers Ltd still trading?
South East Mastclimbers 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 South East Mastclimbers Ltd do?
South East Mastclimbers Ltd is registered under Other construction installation (SIC 43290).
How old is South East Mastclimbers Ltd?
South East Mastclimbers Ltd was incorporated on 18 February 2022, 4 years ago.
What is the penalty if South East Mastclimbers 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 South East Mastclimbers 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.