- Company number
- 14359334
- Incorporated
- 15 Sep 20224 years trading
- Registered office
- 84 Brook Street, Mayfair, London, W1K 5EH
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings; Buying and selling of own real estate; Real estate agencies
Keystone MHD (Entrepreneurs) Limited is a 4-year-old private limited company registered in London, company number 14359334, one of 12,075 building contractors in London. 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.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Keystone MHD (Entrepreneurs) LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 up £34K (+200.6%) on the year before, to £17K.
- Current assets of £1.1M against £54K owed within a year: more than 10 times cover.
- 3 employees on average, up from 2 the year before.
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £17K | £1.1M | £54K | 3 | |
| 31 Mar 2024 | -£17K | £1.1M | £51K | 2 | |
| 30 Jun 2023 | £6,350 | £26K | £32K | 0 |
Where Keystone MHD (Entrepreneurs) Limited is registered
The registered office is in London (W1K), in the Westminster local authority area, London. Show W1K 5EH on a map.
Other trade companies in W1K
- Automotive Networks LimitedMotor traders
- Ahml Didcot LtdProperty developers
- Mayfair Property Services LtdCleaning companies
- Auto Forge NK LimitedMotor traders
- Immofin Re 1 LtdProperty developers
- A&B Coreflow Construction LtdBuilders
- Astor Opco LimitedProperty developers
- Invictus Fire & Security LtdElectricians
Also registered at this address
3 other companies use the same registered office as Keystone MHD (Entrepreneurs) Limited.
- Astor Opco LimitedProperty developers
- Euroglobe Solar Systems LtdSpecialist contractors
- Waterstone Group LtdBuilders
What happens if Keystone MHD (Entrepreneurs) 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
- 14359334
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 September 2022 (4 years ago)
- Registered office
- 84 Brook Street, Mayfair, London, W1K 5EH
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202)
Buying and selling of own real estate (SIC 68100)
Real estate agencies (SIC 68310) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 11 April 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 London
Other active building contractors registered in London.
- Keystone Property Services MS Ltd2025
- Keystone Spaces Ltd2024
- Kezel Ltd2021
- KFL Group Ltd2020
- KG Building Solutions Ltd2015
- KG Design & Build Ltd2024
- KG Fine Constructions Ltd2026
- KG Interior Limited2017
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Keystone MHD (Entrepreneurs) Limited's accounts due?
Keystone MHD (Entrepreneurs) 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 Keystone MHD (Entrepreneurs) 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 Keystone MHD (Entrepreneurs) Limited still trading?
Keystone MHD (Entrepreneurs) 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 MHD (Entrepreneurs) Limited do?
Keystone MHD (Entrepreneurs) Limited is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202); Buying and selling of own real estate (SIC 68100); Real estate agencies (SIC 68310).
How old is Keystone MHD (Entrepreneurs) Limited?
Keystone MHD (Entrepreneurs) Limited was incorporated on 15 September 2022, 4 years ago.
What is the penalty if Keystone MHD (Entrepreneurs) 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 MHD (Entrepreneurs) 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.