- Companies
- Property developers
- Biggleswade
- S.I Design & Build Ltd
S.I Design & Build Ltd
- Company number
- 16707011
- Incorporated
- 10 Sep 20251 year trading
- Registered office
- 3 Macmillan Grove, Biggleswade, SG18 8XL
- Nature of business
- Development of building projects
S.I Design & Build Ltd is a 1-year-old private limited company registered in Biggleswade, company number 16707011, one of 27 property development companies in Biggleswade. Its next accounts are due at Companies House on 10 June 2027, and its first CT600 is due at HMRC on 9 September 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
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Where S.I Design & Build Ltd is registered
The registered office is in Biggleswade (SG18), in the Central Bedfordshire local authority area, East of England. Show SG18 8XL on a map.
Other trade companies in SG18
- Velox Performance LtdMechanics and garages
- Imperial Block and Beam LtdBuilders
- Khyne Homes LimitedProperty developers
- JM Control Installations LtdElectricians
- K Flow Heating and Engineering LimitedPlumbers and heating engineers
- Forward Gear LtdMotor traders
- A-Number One Gardening Services LimitedLandscapers and gardeners
- The Mould Removal Company LtdSpecialist contractors
Also registered at this address
1 other company uses the same registered office as S.I Design & Build Ltd.
- Smith Installations LtdInstallers
What happens if S.I Design & Build 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 10 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Jun 2027 to 10 Jul 2027 | £150 |
| 1 to 3 months late | 11 Jul 2027 to 10 Sep 2027 | £375 |
| 3 to 6 months late | 11 Sep 2027 to 10 Dec 2027 | £750 |
| More than 6 months late | From 11 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 16707011
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 September 2025 (1 year ago)
- Registered office
- 3 Macmillan Grove, Biggleswade, SG18 8XL
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
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 Biggleswade
Other active property development companies registered in Biggleswade.
- Sarc Construction Limited2004
- SSC Ventures Limited2014
- Sutton Properties Limited1995
- Ttsquare Ltd2026
- Whitworth Property Development Ltd2019
- Zero in Developments Ltd2021
- Agrt Enterprises Ltd2020
- Archos Properties Ltd2019
All property development companies in Biggleswade · All trades in Biggleswade · Property developers across the UK
Frequently asked questions
When are S.I Design & Build Ltd's accounts due?
S.I Design & Build Ltd's next accounts are due at Companies House by 10 June 2027 (in 240 days), covering the period to 30 September 2026.
When is S.I Design & Build Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 9 September 2026, due by 9 September 2027, and one for the period to 30 September 2026, due by 30 September 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is S.I Design & Build Ltd still trading?
S.I Design & Build Ltd is listed as active on the Companies House register (checked 13 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 S.I Design & Build Ltd do?
S.I Design & Build Ltd is registered under Development of building projects (SIC 41100).
How old is S.I Design & Build Ltd?
S.I Design & Build Ltd was incorporated on 10 September 2025, 1 year ago.
What is the penalty if S.I Design & Build 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 S.I Design & Build Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.