- Companies
- Installers
- Portsmouth
- Knightwood Southern Limited
Knightwood Southern Limited
- Company number
- 17124236
- Incorporated
- 30 Mar 2026
- Registered office
- Office 83 Regus, Building 1000 Lakeside, Western Road, Portsmouth, Hampshire, PO6 3EZ
- Nature of business
- Other construction installation
Knightwood Southern Limited is a newly incorporated private limited company registered in Portsmouth, company number 17124236, one of 84 installation companies (insulation, lifts, shutters and similar) in Portsmouth. Its next accounts are due at Companies House on 30 December 2027, and its first CT600 is due at HMRC on 29 March 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.
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Where Knightwood Southern Limited is registered
The registered office is in Portsmouth (PO6), in the Portsmouth local authority area, South East. Show PO6 3EZ on a map.
Other trade companies in PO6
- Bellagio Partners LtdBuilders
- Cpenw LtdMachinery repair and installation
- Marla Brickwork & Construction LtdProperty developers
- Miracles in Metal LtdMechanics and garages
- FH Fire & Electrical LtdElectricians
- Thomcore LimitedSpecialist contractors
- JMS Southern LtdElectricians
- The Motum Group LtdSpecialist contractors
Shared registered office
29 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 Knightwood Southern 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 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 31 Dec 2027 to 30 Jan 2028 | £150 |
| 1 to 3 months late | 31 Jan 2028 to 30 Mar 2028 | £375 |
| 3 to 6 months late | 31 Mar 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 17124236
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 March 2026
- Registered office
- Office 83 Regus, Building 1000 Lakeside, Western Road, Portsmouth, Hampshire, PO6 3EZ
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Portsmouth
Other active installation companies (insulation, lifts, shutters and similar) registered in Portsmouth.
- Konnect Contractors Limited2024
- Lamonbys Limited2010
- M & L Page Construction Ltd2004
- MJRM Construction Ltd2026
- Molco Interiors Ltd2024
- Pivotal Ac Limited2026
- Priory Building & Development Limited2003
- Profix Southern Ltd2017
All installation companies (insulation, lifts, shutters and similar) in Portsmouth · All trades in Portsmouth · Installers across the UK
Frequently asked questions
When are Knightwood Southern Limited's accounts due?
Knightwood Southern Limited's next accounts are due at Companies House by 30 December 2027 (in 443 days), covering the period to 31 March 2027.
When is Knightwood Southern Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 29 March 2027, due by 29 March 2028, and one for the period to 31 March 2027, due by 31 March 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Knightwood Southern Limited still trading?
Knightwood Southern 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 Knightwood Southern Limited do?
Knightwood Southern Limited is registered under Other construction installation (SIC 43290).
How old is Knightwood Southern Limited?
Knightwood Southern Limited was incorporated on 30 March 2026, less than a year ago.
What is the penalty if Knightwood Southern 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 Knightwood Southern 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.