- Companies
- Property developers
- Harrow
- Sun-Ex 21 Limited
Sun-Ex 21 Limited
- Company number
- 12278577
- Incorporated
- 24 Oct 20196 years trading
- Registered office
- 5 Jardine House Harrovian Business Village, Bessborough Road, Harrow, Middlesex, HA1 3EX
- Nature of business
- Development of building projects
Sun-Ex 21 Limited is a 6-year-old private limited company registered in Harrow, company number 12278577, one of 679 property development companies in Harrow. 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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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 £118K (-137.7%) on the year before, to -£204K.
- Net assets rose in 0 of 5 year-on-year comparisons on record.
- Current assets of £1.4M against £1.6M owed within a year: 0.9 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | -£204K | £23K | £1.4M | £1.6M | 0 |
| 31 Dec 2024 | -£86K | £14K | £1.4M | £1.4M | 0 |
| 31 Dec 2023 | -£75K | £8,299 | £1.1M | £1.2M | 0 |
| 31 Dec 2022 | -£59K | £5,547 | £1.1M | £1.1M | 0 |
| 31 Dec 2021 | -£32K | £21K | £1.1M | £1.1M | 0 |
| 31 Oct 2020 | £1,415 | £1M | £2,172 | 1 |
Where Sun-Ex 21 Limited is registered
The registered office is in Harrow (HA1), in the Harrow local authority area, London. Show HA1 3EX on a map.
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- Ac Operations LtdScaffolders
- Verde Masters LtdLandscapers and gardeners
- Omega Works Group LtdLandscapers and gardeners
- Call 'Em LimitedPlumbers and heating engineers
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- DRV Property Solutions LtdPainters and decorators
Also registered at this address
20 other companies use the same registered office as Sun-Ex 21 Limited.
- Advanced Cooling & Heating LtdPlumbers and heating engineers
- Akilla Engines LimitedMechanics and garages
- Aurora Terrazzo LimitedSpecialist contractors
- Bampton Property LtdProperty developers
- Carpenters 24/7 Construction LimitedJoiners and carpenters
- Ceo Construction LtdCivil engineering
- Conova Construction LtdProperty developers
- Cornerstone Design & Build LtdFinishing trades
- D-Coded International LimitedFinishing trades
- Elecguard LtdElectricians
- Greenoaks Construction LimitedBuilders
- Harrington Maintenance Company LimitedElectricians
- Home Field Construction LimitedElectricians
- Kas Construction & Project Management LtdSpecialist contractors
- Len Beaman (ST Helens) LtdProperty developers
- Nasco Enterprises LimitedFinishing trades
- NCP Construction LtdFinishing trades
- PDGB LimitedFinishing trades
- Tayross Homes LimitedProperty developers
- TM Linemarking LtdSpecialist contractors
What happens if Sun-Ex 21 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
- 12278577
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 October 2019 (6 years ago)
- Registered office
- 5 Jardine House Harrovian Business Village, Bessborough Road, Harrow, Middlesex, HA1 3EX
- 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
- 8 November 2025
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 Harrow
Other active property development companies registered in Harrow.
- Sunny Top Cookham Limited2025
- Swan Property Developers Limited2017
- Syam Construction Ltd2021
- Syon Hotels Limited2014
- T-Stones Ltd2007
- T.V. Antoni Properties & Investments Limited1962
- Tara Property Company Limited2001
- Target Property and Investments Limited1980
All property development companies in Harrow · All trades in Harrow · Property developers across the UK
Frequently asked questions
When are Sun-Ex 21 Limited's accounts due?
Sun-Ex 21 Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Sun-Ex 21 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 Sun-Ex 21 Limited still trading?
Sun-Ex 21 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 Sun-Ex 21 Limited do?
Sun-Ex 21 Limited is registered under Development of building projects (SIC 41100).
How old is Sun-Ex 21 Limited?
Sun-Ex 21 Limited was incorporated on 24 October 2019, 6 years ago.
What is the penalty if Sun-Ex 21 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 Sun-Ex 21 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.