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- Keystone Architectural Surveying and Developments Limited
Keystone Architectural Surveying and Developments Limited
- Company number
- 15446488
- Incorporated
- 27 Jan 20242 years trading
- Registered office
- 40A Coniscliffe Road, Darlington, DL3 7RG
- Nature of business
- Construction of domestic buildings
Keystone Architectural Surveying and Developments Limited is a 2-year-old private limited company registered in Darlington, company number 15446488, one of 54 building contractors in Darlington. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 January 2025, as filed at Companies House.
Where Keystone Architectural Surveying and Developments Limited is registered
The registered office is in Darlington (DL3), in the Darlington local authority area, North East. Show DL3 7RG on a map.
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What happens if Keystone Architectural Surveying and Developments 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 15446488
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 January 2024 (2 years ago)
- Registered office
- 40A Coniscliffe Road, Darlington, DL3 7RG
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 26 January 2026
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Darlington
Other active building contractors registered in Darlington.
- L Graney Plumbing & Heating Ltd2021
- Merrybent Project Management Ltd.2004
- Metro Ceramics Limited2006
- MMB Properties Ltd2001
- Mulholland Builders Limited2020
- Newalldevelopmentgroup Ltd2024
- Next Level Construction Services Limited2024
- Nicoll Sub Contractors Ltd2025
All building contractors in Darlington · All trades in Darlington · Builders across the UK
Frequently asked questions
When are Keystone Architectural Surveying and Developments Limited's accounts due?
Keystone Architectural Surveying and Developments Limited's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is Keystone Architectural Surveying and Developments Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is Keystone Architectural Surveying and Developments Limited still trading?
Keystone Architectural Surveying and Developments 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 Keystone Architectural Surveying and Developments Limited do?
Keystone Architectural Surveying and Developments Limited is registered under Construction of domestic buildings (SIC 41202).
How old is Keystone Architectural Surveying and Developments Limited?
Keystone Architectural Surveying and Developments Limited was incorporated on 27 January 2024, 2 years ago.
What is the penalty if Keystone Architectural Surveying and Developments 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 Keystone Architectural Surveying and Developments 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.