- Companies
- Property developers
- Belfast
- Si-Tu Design Limited
Si-Tu Design Limited
- Company number
- NI651299
- Incorporated
- 27 Feb 20188 years trading
- Registered office
- 9 Sarajac Crescent, Belfast, BT14 6SD
- Nature of business
- Development of building projects; Architectural activities; Urban planning and landscape architectural activities
Si-Tu Design Limited is a 8-year-old private limited company registered in Belfast, company number NI651299, one of 402 property development companies in Belfast. 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.
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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 £53 (-0.2%) on the year before, to £22K.
- Net assets rose in 3 of 6 year-on-year comparisons on record.
- Current assets of £32K against £14K owed within a year: 2.2 times cover.
- 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 |
|---|---|---|---|---|---|
| 31 Mar 2025 | £22K | £32K | £14K | 1 | |
| 28 Feb 2024 | £22K | £28K | £8,145 | 1 | |
| 28 Feb 2023 | £29K | £33K | £7,782 | 1 | |
| 28 Feb 2022 | £1,882 | £9,399 | £11K | 1 | |
| 28 Feb 2021 | £20K | £24K | £241 | 1 | |
| 29 Feb 2020 | £9,340 | £16K | £7,389 | 1 | |
| 28 Feb 2019 | £20 |
Where Si-Tu Design Limited is registered
The registered office is in Belfast (BT14), in the Belfast local authority area, Northern Ireland. Show BT14 6SD on a map.
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What happens if Si-Tu Design 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
- NI651299
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 February 2018 (8 years ago)
- Registered office
- 9 Sarajac Crescent, Belfast, BT14 6SD
- Nature of business
- Development of building projects (SIC 41100)
Architectural activities (SIC 71111)
Urban planning and landscape architectural activities (SIC 71112) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 11 March 2026
- Previous names
- Studio Architext Limited (until 22 Jul 2019)
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 Belfast
Other active property development companies registered in Belfast.
- Sifi Properties Limited2019
- Smith Building Contracts Ltd2023
- Sona Homes Ltd2021
- Sovereign Contractors N.I. Ltd2026
- SRH Developments (NI) Ltd2022
- ST Judes Investments Limited2020
- Stang Construction Limited2005
- Station Road RSR (No.1) Limited2016
All property development companies in Belfast · All trades in Belfast · Property developers across the UK
Frequently asked questions
When are Si-Tu Design Limited's accounts due?
Si-Tu Design 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 Si-Tu Design 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 Si-Tu Design Limited still trading?
Si-Tu Design 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 Si-Tu Design Limited do?
Si-Tu Design Limited is registered under Development of building projects (SIC 41100); Architectural activities (SIC 71111); Urban planning and landscape architectural activities (SIC 71112).
How old is Si-Tu Design Limited?
Si-Tu Design Limited was incorporated on 27 February 2018, 8 years ago.
What is the penalty if Si-Tu Design 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 Si-Tu Design 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.