- Companies
- Civil engineering
- Northwood
- Mastermac Civils Limited
Mastermac Civils Limited
- Company number
- 17041957
- Incorporated
- 18 Feb 2026
- Registered office
- 27A Maxwell Road, Northwood, HA6 2XY
- Nature of business
- Construction of roads and motorways
Mastermac Civils Limited is a newly incorporated private limited company registered in Northwood, company number 17041957, one of 6 civil engineering contractors in Northwood. Its next accounts are due at Companies House on 18 November 2027, and its first CT600 is due at HMRC on 17 February 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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Public contracts won
Mastermac Civils Limited has 4 public sector contract awards on record; the ones with their own published value total £165K (2026). Source: Contracts Finder and Find a Tender award notices. For 1 of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown.
Awards by year
Main buyers
- Epping Forest District Council4 awards
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Epping Forest District Council | Demolition of The Princess of Wales Pub at 41 Westall Road, Debden, Essex | £42K | 10 Aug 2026 |
| Epping Forest District Council | Provision of Repairs and Maintenance | Ceiling, not shown | 21 Jul 2026 |
| Epping Forest District Council | Garage Demolition & Hoarding at Lane B, Garages at Pyrles Lane, Loughton | £60K | 1 Jun 2026 |
| Epping Forest District Council | Garage Demolition & Hoarding at Lane A, Garages at Pyrles Lane, Loughton | £63K | 1 Jun 2026 |
Where Mastermac Civils Limited is registered
The registered office is in Northwood (HA6), in the Hillingdon local authority area, London. Show HA6 2XY on a map.
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Shared registered office
52 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 Mastermac Civils 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 18 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 19 Nov 2027 to 18 Dec 2027 | £150 |
| 1 to 3 months late | 19 Dec 2027 to 18 Feb 2028 | £375 |
| 3 to 6 months late | 19 Feb 2028 to 18 May 2028 | £750 |
| More than 6 months late | From 19 May 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 17041957
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 February 2026
- Registered office
- 27A Maxwell Road, Northwood, HA6 2XY
- Nature of business
- Construction of roads and motorways (SIC 42110)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Northwood
Other active civil engineering contractors registered in Northwood.
- QNB Engineering Ltd2019
- Sigma Ventures Ltd2022
- Ymgb. Ltd2018
- Ame Rail Ltd2025
- Clou Engineering Ltd2014
All civil engineering contractors in Northwood · All trades in Northwood · Civil engineering across the UK
Frequently asked questions
When are Mastermac Civils Limited's accounts due?
Mastermac Civils Limited's next accounts are due at Companies House by 18 November 2027 (in 401 days), covering the period to 31 March 2027.
When is Mastermac Civils Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 17 February 2027, due by 17 February 2028, and one for the period to 31 March 2027, due by 31 March 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Mastermac Civils Limited still trading?
Mastermac Civils 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 Mastermac Civils Limited do?
Mastermac Civils Limited is registered under Construction of roads and motorways (SIC 42110).
How old is Mastermac Civils Limited?
Mastermac Civils Limited was incorporated on 18 February 2026, less than a year ago.
Has Mastermac Civils Limited won public sector contracts?
Yes. Mastermac Civils Limited has 4 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £165K), most recently from Epping Forest District Council.
What is the penalty if Mastermac Civils 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 Mastermac Civils 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.