- Companies
- Property developers
- Didcot
- The Harwell Quad One Limited
The Harwell Quad One Limited
- Company number
- 10289329
- Incorporated
- 21 Jul 201610 years trading
- Registered office
- Quad Two Rutherford Avenue, Harwell Campus, Didcot, OX11 0DF
- Nature of business
- Development of building projects
The Harwell Quad One Limited is a 10-year-old private limited company registered in Didcot, company number 10289329, one of 23 property development companies in Didcot. 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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Where The Harwell Quad One Limited is registered
The registered office is in Didcot (OX11), in the Vale of White Horse local authority area, South East. Show OX11 0DF on a map.
Other trade companies in OX11
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- Millbrook Development LimitedProperty developers
- DJM Rail Services LtdElectricians
- Lacy Developments LtdBuilders
- The Harwell Science and Innovation Campus No.5 Nominee LimitedProperty developers
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Also registered at this address
1 other company uses the same registered office as The Harwell Quad One Limited.
- The Harwell Science and Innovation Campus No.5 Nominee LimitedProperty developers
What happens if The Harwell Quad One 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
- 10289329
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 July 2016 (10 years ago)
- Registered office
- Quad Two Rutherford Avenue, Harwell Campus, Didcot, OX11 0DF
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 7 August 2026
- Charges (mortgages)
- 2 outstanding of 8 registered
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 Didcot
Other active property development companies registered in Didcot.
- The Harwell Science and Innovation Campus No.5 Nominee Limited2026
- VMM Fire Ltd2024
- Applethorpe Developments Limited2016
- Aquaterra Limited1998
- Art&J Ltd2026
- Ashbrook Limited1982
- Clarus Brickwork Limited2026
- Classic Dwellings Limited2024
All property development companies in Didcot · All trades in Didcot · Property developers across the UK
Frequently asked questions
When are The Harwell Quad One Limited's accounts due?
The Harwell Quad One 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 The Harwell Quad One 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 The Harwell Quad One Limited still trading?
The Harwell Quad One 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 The Harwell Quad One Limited do?
The Harwell Quad One Limited is registered under Development of building projects (SIC 41100).
How old is The Harwell Quad One Limited?
The Harwell Quad One Limited was incorporated on 21 July 2016, 10 years ago.
What is the penalty if The Harwell Quad One 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 The Harwell Quad One 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.