- Companies
- Specialist contractors
- Swaffham
- Keystone CMS Ltd
Keystone CMS Ltd
- Company number
- 17216205
- Incorporated
- 13 May 2026
- Registered office
- 24 Market Place, Swaffham, Norfolk, PE37 7QH
- Nature of business
- Other specialised construction activities n.e.c.
Keystone CMS Ltd is a newly incorporated private limited company registered in Swaffham, company number 17216205, one of 11 specialist construction companies in Swaffham. Its next accounts are due at Companies House on 13 February 2028, and its first CT600 is due at HMRC on 12 May 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 Keystone CMS Ltd is registered
The registered office is in Swaffham (PE37), in the Breckland local authority area, East of England. Show PE37 7QH on a map.
Other trade companies in PE37
- Kris Group LimitedBuilders
- Rawh Stock LimitedMotor traders
- Codo Leisure LtdMotor traders
- E Briston Plumbing and Heating LimitedPlumbers and heating engineers
- Chimney Sweep Norfolk LtdCleaning companies
- KT Civil & Safety LtdCivil engineering
- Maple Aquatics LtdLandscapers and gardeners
- Eastern Contracts LtdElectricians
Shared registered office
90 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 Keystone CMS 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 13 February 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 14 Feb 2028 to 13 Mar 2028 | £150 |
| 1 to 3 months late | 14 Mar 2028 to 13 May 2028 | £375 |
| 3 to 6 months late | 14 May 2028 to 13 Aug 2028 | £750 |
| More than 6 months late | From 14 Aug 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2028 | £200 |
| 3 months late | 31 Aug 2028 | another £200 |
| 6 months late | 30 Nov 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 17216205
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 May 2026
- Registered office
- 24 Market Place, Swaffham, Norfolk, PE37 7QH
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 May (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Swaffham
Other active specialist construction companies registered in Swaffham.
- Mesh CMS Limited2020
- RMG Contracting Ltd2025
- SPH (Norfolk) Limited2000
- Comaserve CMS UK Limited2020
- Comaserve Limited2016
- Dimension Brickwork Ltd2022
- Eastern Drainage Services Ltd2010
- Eichinger Equipment Ltd2011
All specialist construction companies in Swaffham · All trades in Swaffham · Specialist contractors across the UK
Frequently asked questions
When are Keystone CMS Ltd's accounts due?
Keystone CMS Ltd's next accounts are due at Companies House by 13 February 2028 (in 489 days), covering the period to 31 May 2027.
When is Keystone CMS 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 12 May 2027, due by 12 May 2028, and one for the period to 31 May 2027, due by 31 May 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone CMS Ltd still trading?
Keystone CMS 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 Keystone CMS Ltd do?
Keystone CMS Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Keystone CMS Ltd?
Keystone CMS Ltd was incorporated on 13 May 2026, less than a year ago.
What is the penalty if Keystone CMS 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 Keystone CMS 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.