- Companies
- Civil engineering
- Cambridge
- M G Monk & Son Limited
M G Monk & Son Limited
- Company number
- 06861878
- Incorporated
- 27 Mar 200917 years trading
- Registered office
- 1 the Maples, Fulbourn, Cambridge, CB21 5DW
- Nature of business
- Construction of other civil engineering projects n.e.c.
M G Monk & Son Limited is a 17-year-old private limited company registered in Cambridge, company number 06861878, one of 52 civil engineering contractors in Cambridge. 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 M G Monk & Son 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 down £32K (-97.4%) on the year before, to -£65K.
- Net assets rose in 2 of 9 year-on-year comparisons on record.
- Current assets of £93K against £172K owed within a year: 0.5 times cover.
- 5 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | -£65K | £93K | £172K | 5 | |
| 31 Mar 2024 | -£33K | £100K | £139K | 5 | |
| 31 Mar 2023 | -£1,892 | £147K | £144K | 4 | |
| 31 Mar 2022 | £443 | £11K | £219K | £196K | 4 |
| 31 Mar 2021 | £977 | £753 | £152K | £110K | 4 |
| 31 Mar 2020 | £265 | £251 | £100K | £102K | 5 |
| 31 Mar 2019 | -£21K | £251 | £92K | £112K | 5 |
| 31 Mar 2018 | £62 | £237 | £89K | £90K | 5 |
| 31 Mar 2017 | £8,450 | £13K | £125K | £125K | |
| 31 Mar 2016 | £11K | £0 | £147K | £148K |
Who runs and owns M G Monk & Son Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| C*** M*** | Director | Mar 2009 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| M*** M*** | Director | Mar 2009 | Dec 2022 |
Person with significant control
Where M G Monk & Son Limited is registered
The registered office is in Cambridge (CB21), in the South Cambridgeshire local authority area, East of England. Show CB21 5DW on a map.
Other trade companies in CB21
- Frosty Fellas LtdPlumbers and heating engineers
- Joe's Auto Tuning LtdMechanics and garages
- Camputer LtdRepair services
- Davis Projects LimitedBuilders
- Taurus Racing LimitedMechanics and garages
- Mizon Thatchers LtdRoofers
- Constellation Housing LtdProperty developers
- C&A Londonconstruction LtdSpecialist contractors
What happens if M G Monk & Son 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
- 06861878
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 March 2009 (17 years ago)
- Registered office
- 1 the Maples, Fulbourn, Cambridge, CB21 5DW
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 16 December 2025
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 Cambridge
Other active civil engineering contractors registered in Cambridge.
- Martyn Leeks Limited2006
- Mead Construction (Cambridge) Limited2000
- MT Groundworks (East Anglia) Ltd2015
- New Civils Construction Limited2014
- P&T Munnelly Construction Limited2018
- Potter & Potter (Building Consultants) Limited2005
- Power Distribution Support Ltd2014
- Pro Patch Limited2021
All civil engineering contractors in Cambridge · All trades in Cambridge · Civil engineering across the UK
Frequently asked questions
When are M G Monk & Son Limited's accounts due?
M G Monk & Son 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 M G Monk & Son 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 M G Monk & Son Limited still trading?
M G Monk & Son 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 M G Monk & Son Limited do?
M G Monk & Son Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is M G Monk & Son Limited?
M G Monk & Son Limited was incorporated on 27 March 2009, 17 years ago.
Who runs M G Monk & Son Limited?
M G Monk & Son Limited has 1 active director, the longest-serving appointed in Mar 2009. Their names and service addresses are on the Companies House register.
Who owns M G Monk & Son Limited?
One person or company has significant control of M G Monk & Son Limited: an individual (owns 25% to 50% of the shares).
What is the penalty if M G Monk & Son 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 M G Monk & Son 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.