- Companies
- Plasterers
- Northampton
- Si Interior Sistems Ltd
Si Interior Sistems Ltd
- Company number
- 17443558
- Incorporated
- 7 Sep 2026
- Registered office
- 5 Foskitt Court South, Northampton, NN3 9AX
- Nature of business
- Plastering; Joinery installation; Other building completion and finishing
Si Interior Sistems Ltd is a newly incorporated private limited company registered in Northampton, company number 17443558, one of 44 plastering companies in Northampton. Its next accounts are due at Companies House on 7 June 2028, and its first CT600 is due at HMRC on 6 September 2028.
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?
File the first accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Si Interior Sistems LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Where Si Interior Sistems Ltd is registered
The registered office is in Northampton (NN3), in the West Northamptonshire local authority area, East Midlands. Show NN3 9AX on a map.
Other trade companies in NN3
- Building Services LtdBuilders
- Cma Constuction Group LtdSpecialist contractors
- Auto Correct Repairs LtdMotor traders
- LCK & Son LimitedLandscapers and gardeners
- Atlas Engeenering LtdCivil engineering
- Oakwell Energy Systems LtdElectricians
- Imdl Construction LtdBuilders
- BC Developments and Construction Group UK LtdProperty developers
What happens if Si Interior Sistems 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 7 June 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 8 Jun 2028 to 7 Jul 2028 | £150 |
| 1 to 3 months late | 8 Jul 2028 to 7 Sep 2028 | £375 |
| 3 to 6 months late | 8 Sep 2028 to 7 Dec 2028 | £750 |
| More than 6 months late | From 8 Dec 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2028 | £200 |
| 3 months late | 30 Dec 2028 | another £200 |
| 6 months late | 30 Mar 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 2029 | 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
- 17443558
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 September 2026
- Registered office
- 5 Foskitt Court South, Northampton, NN3 9AX
- Nature of business
- Plastering (SIC 43310)
Joinery installation (SIC 43320)
Other building completion and finishing (SIC 43390) - Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for plastering companies
Plastering companies are usually small, labour-based businesses. Director pay is often a mix of salary and dividends, which only works if the company has profits to pay dividends from.
Similar companies in Northampton
Other active plastering companies registered in Northampton.
- Sibley Plastering Contractors Ltd2022
- Sofia&Boys Ltd2025
- T.W. Plastering Company Ltd2022
- Akcent Aspect Ltd2022
- Artisan Contracts Limited2019
- Ashwood Plastering Northampton Limited2018
- Austin Plastering Ltd2016
- Besleaga Construction Ltd2025
All plastering companies in Northampton · All trades in Northampton · Plasterers across the UK
Frequently asked questions
When are Si Interior Sistems Ltd's accounts due?
Si Interior Sistems Ltd's next accounts are due at Companies House by 7 June 2028 (in 603 days), covering the period to 30 September 2027.
When is Si Interior Sistems 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 6 September 2027, due by 6 September 2028, and one for the period to 30 September 2027, due by 30 September 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Si Interior Sistems Ltd still trading?
Si Interior Sistems 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 Si Interior Sistems Ltd do?
Si Interior Sistems Ltd is registered under Plastering (SIC 43310); Joinery installation (SIC 43320); Other building completion and finishing (SIC 43390).
How old is Si Interior Sistems Ltd?
Si Interior Sistems Ltd was incorporated on 7 September 2026, less than a year ago.
What is the penalty if Si Interior Sistems 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 Si Interior Sistems 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.