- Companies
- Machinery repair and installation
- Northampton
- Mammoth Insulation Services Limited
Mammoth Insulation Services Limited
- Company number
- 08670431
- Incorporated
- 30 Aug 201313 years trading
- Registered office
- Unit 29 Northampton Road, Blisworth, Northampton, NN7 3DW
- Nature of business
- Installation of industrial machinery and equipment
Mammoth Insulation Services Limited is a 13-year-old private limited company registered in Northampton, company number 08670431, one of 107 machinery repair and installation companies in Northampton. 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.
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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 up £55K (+15.3%) on the year before, to £419K.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £413K against £94K owed within a year: 4.4 times cover.
- 8 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 | £419K | £413K | £94K | 8 | |
| 31 Mar 2024 | £363K | £322K | £75K | 8 | |
| 31 Mar 2023 | £336K | £396K | £109K | 6 | |
| 31 Mar 2022 | £249K | £252K | £69K | 7 | |
| 31 Mar 2021 | £221K | £354K | £128K | 6 | |
| 31 Mar 2020 | £144K | £238K | £119K | 7 | |
| 31 Mar 2019 | £124K | £232K | £133K | ||
| 31 Mar 2018 | £123K | £215K | £118K | ||
| 31 Mar 2017 | £147K | £199K | £81K | ||
| 31 Mar 2016 | £131K | £31K | £177K | £79K |
Where Mammoth Insulation Services Limited is registered
The registered office is in Northampton (NN7), in the West Northamptonshire local authority area, East Midlands. Show NN7 3DW on a map.
Other trade companies in NN7
- Cortinox LtdSpecialist contractors
- A & J Build LimitedProperty developers
- House21 Interiors LimitedJoiners and carpenters
- Air Fireshield LtdInstallers
- Autos Ace LtdMechanics and garages
- Alpha Plumbing & Air Conditioning LtdPlumbers and heating engineers
- Antoxa Garage LimitedMechanics and garages
- MLW Civils LtdCivil engineering
Also registered at this address
8 other companies use the same registered office as Mammoth Insulation Services Limited.
- Ac Electrical (MK) LimitedElectricians
- Archihouse Ltd.Property developers
- Chapclad LtdSpecialist contractors
- CW Installations MK LimitedSpecialist contractors
- D B J Services LimitedMachinery repair and installation
- Olivia House Developments LimitedGlaziers
- RDP Cladding LtdRoofers
- Saw Brickwork LimitedSpecialist contractors
What happens if Mammoth Insulation Services 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
- 08670431
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 August 2013 (13 years ago)
- Registered office
- Unit 29 Northampton Road, Blisworth, Northampton, NN7 3DW
- Nature of business
- Installation of industrial machinery and equipment (SIC 33200)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 30 August 2026
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Northampton
Other active machinery repair and installation companies registered in Northampton.
- Marine Tech Service 1983 Ltd2024
- MB Forklifts Ltd2022
- Mercedes Van Services Ltd2025
- Midas Electronic Services Limited2016
- Midlands Catering Equipment Limited2020
- MPG Autos Limited2012
- MSM 2024 Ltd2026
- Northants Pressure Washers Ltd2025
All machinery repair and installation companies in Northampton · All trades in Northampton · Machinery repair and installation across the UK
Frequently asked questions
When are Mammoth Insulation Services Limited's accounts due?
Mammoth Insulation Services 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 Mammoth Insulation Services 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 Mammoth Insulation Services Limited still trading?
Mammoth Insulation Services 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 Mammoth Insulation Services Limited do?
Mammoth Insulation Services Limited is registered under Installation of industrial machinery and equipment (SIC 33200).
How old is Mammoth Insulation Services Limited?
Mammoth Insulation Services Limited was incorporated on 30 August 2013, 13 years ago.
What is the penalty if Mammoth Insulation Services 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 Mammoth Insulation Services 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.