- Companies
- Specialist contractors
- Harpenden
- Khalkedon & Co. Ltd
Khalkedon & Co. Ltd
- Company number
- 12819190
- Incorporated
- 17 Aug 20206 years trading
- Registered office
- C/O Fdca- Office 2 Bennet's House, 21 Leyton Road, Harpenden, Hertfordshire, AL5 2HU
- Nature of business
- Other specialised construction activities n.e.c.; Translation and interpretation activities; Other education n.e.c.; Other service activities n.e.c.
Khalkedon & Co. Ltd is a 6-year-old private limited company registered in Harpenden, company number 12819190, one of 17 specialist construction companies in Harpenden. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £268 (-52.1%) on the year before, to £246.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £3,519 against £3,273 owed within a year: 1.1 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £246 | £4 | £3,519 | £3,273 | 1 |
| 31 Dec 2024 | £514 | £22 | £9,252 | £8,738 | 1 |
| 31 Dec 2023 | £448 | £1,231 | £4,856 | £4,408 | 1 |
| 31 Dec 2022 | £300 | £228 | £3,137 | £2,837 | 1 |
| 31 Dec 2021 | £116 | £1,157 | £1,798 | £1,682 | 1 |
Where Khalkedon & Co. Ltd is registered
The registered office is in Harpenden (AL5), in the St Albans local authority area, East of England. Show AL5 2HU on a map.
Other trade companies in AL5
- M&T Building Services LimitedBuilders
- Rolfe Groundworks LtdGroundworks and demolition
- Rolls and Sons LtdProperty developers
- WM Holdings Group LtdProperty developers
- A Hussain Motor Group LtdMotor traders
- Harpenden Window Cleaning LtdCleaning companies
- Honey Bear Energy LimitedPlumbers and heating engineers
- M&D Paving LtdCivil engineering
Also registered at this address
12 other companies use the same registered office as Khalkedon & Co. Ltd.
- Amd Ceramics LimitedSpecialist contractors
- Atlas Yachting LimitedMachinery repair and installation
- DCS Smart Control Systems LimitedMachinery repair and installation
- Fineall Consulting LtdCivil engineering
- Flash Tiles LtdBuilders
- Goobe Construction Solutions LtdProperty developers
- Kanar Engineering LtdBuilders
- Ozdemir Construction LtdCivil engineering
- Ozgur Car Body Repair LtdMotor traders
- Sarikaya Plumbing and Heating LtdPlumbers and heating engineers
- Sunrise Marine LtdMachinery repair and installation
- Tema Construction LtdProperty developers
What happens if Khalkedon & Co. 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 12819190
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 August 2020 (6 years ago)
- Registered office
- C/O Fdca- Office 2 Bennet's House, 21 Leyton Road, Harpenden, Hertfordshire, AL5 2HU
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
Translation and interpretation activities (SIC 74300)
Other education n.e.c. (SIC 85590)
Other service activities n.e.c. (SIC 96090) - Year end
- 31 December (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 25 April 2026
- Previous names
- Khalkedon Language & Consultancy Services Ltd (until 1 Jun 2023)
Ci Translation Services Ltd (until 15 Jan 2021)
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 Harpenden
Other active specialist construction companies registered in Harpenden.
- Lewis Property Design & Build Ltd2026
- Marshall Carpentry Services Ltd2015
- MHR Renovations Ltd2026
- Ridgewood Contractors Limited2010
- Sachelle Interior Designs Limited1980
- Shoreline Press (UK) Ltd2012
- Abel Street Limited2019
- Amd Ceramics Limited2019
All specialist construction companies in Harpenden · All trades in Harpenden · Specialist contractors across the UK
Frequently asked questions
When are Khalkedon & Co. Ltd's accounts due?
Khalkedon & Co. Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Khalkedon & Co. Ltd's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Khalkedon & Co. Ltd still trading?
Khalkedon & Co. 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 Khalkedon & Co. Ltd do?
Khalkedon & Co. Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999); Translation and interpretation activities (SIC 74300); Other education n.e.c. (SIC 85590); Other service activities n.e.c. (SIC 96090).
How old is Khalkedon & Co. Ltd?
Khalkedon & Co. Ltd was incorporated on 17 August 2020, 6 years ago.
What is the penalty if Khalkedon & Co. 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 Khalkedon & Co. 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.