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- Summix Sol Developments Limited
Company profile · Property developers
Summix Sol Developments Limited
Summix Sol Developments Limited is a 8-year-old private limited company registered in London, company number 11495474, one of 14,100 property development companies in London. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 December 2025, as filed at Companies House. Negative net assets mean the company owed more than it owned at that date.
Summix Sol Developments Limited over the years
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 £103K (-18.2%) on the year before, to -£666K.
- Net assets rose in 0 of 7 year-on-year comparisons on record.
- 4 employees 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 Dec 2025 | -£666K | £0 | £1.6M | 4 | |
| 31 Dec 2024 | -£563K | £36 | £1.5M | 4 | |
| 31 Dec 2023 | -£459K | £1.4M | 3 | ||
| 31 Dec 2022 | -£349K | £0 | £967K | £1.3M | 3 |
| 31 Dec 2021 | -£268K | £113 | £967K | £1.2M | 3 |
| 31 Dec 2020 | -£181K | £313 | £965K | £1.1M | 3 |
| 31 Dec 2019 | -£94K | £1,339 | £962K | £1.1M | 3 |
| 31 Dec 2018 | -£4,181 | £835 | £924K | £929K |
Where Summix Sol Developments Limited is registered
The registered office is in London (W1J), in the Westminster local authority area, London. Show W1J 6BY on a map.
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Shared registered office
27 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 Summix Sol Developments 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 11495474
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 August 2018 (8 years ago)
- Registered office
- Fifth Floor, Berkeley Square House, Berkeley Square, London, W1J 6BY
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 31 July 2026
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in London
Other active property development companies registered in London.
- Summix SRD Developments Limited2017
- Summix Vfa Developments Limited2025
- Summix WPW Developments Limited2019
- Sumskas Building Ltd2026
- Sun & Harrow Ltd2015
- Sun City Projects UK Ltd2020
- Sun Contractors Limited2004
- Sun Contractors London Ltd2024
All property development companies in London · All trades in London · Property developers across the UK
Frequently asked questions
When are Summix Sol Developments Limited's accounts due?
Summix Sol Developments Limited's next accounts are due at Companies House by 30 September 2027 (in 353 days), covering the period to 31 December 2026.
When is Summix Sol Developments Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Summix Sol Developments Limited still trading?
Summix Sol Developments 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 Summix Sol Developments Limited do?
Summix Sol Developments Limited is registered under Development of building projects (SIC 41100).
How old is Summix Sol Developments Limited?
Summix Sol Developments Limited was incorporated on 1 August 2018, 8 years ago.
What is the penalty if Summix Sol Developments 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 Summix Sol Developments 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.