- Companies
- Plumbers and heating engineers
- Northampton
- Hartwell & Son Limited
Hartwell & Son Limited
- Company number
- 09310577
- Incorporated
- 14 Nov 201411 years trading
- Registered office
- Pacioli House 9 Brookfield, Duncan Close, Moulton Park, Northampton, NN3 6WL
- Nature of business
- Plumbing, heat and air-conditioning installation
Hartwell & Son Limited is a 11-year-old private limited company registered in Northampton, company number 09310577, one of 197 plumbing and heating companies in Northampton. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £17K (-8.6%) on the year before, to £184K.
- Net assets rose in 5 of 8 year-on-year comparisons on record.
- Current assets of £408K against £229K owed within a year: 1.8 times cover.
- 3 employees on average, down from 4 the year before.
- Balance sheets on record for 9 years, 2018 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £184K | £26K | £408K | £229K | 3 |
| 31 Mar 2025 | £202K | £100K | £444K | £248K | 4 |
| 31 Mar 2024 | £198K | £199K | £278K | £85K | 4 |
| 31 Mar 2023 | £185K | £223K | £289K | £111K | 4 |
| 31 Mar 2022 | £141K | £165K | £243K | £109K | 4 |
| 31 Mar 2021 | £53K | £80K | £140K | £95K | 4 |
| 31 Mar 2020 | £68K | £93K | £104K | £47K | 4 |
| 31 Mar 2019 | £21K | £19K | £22K | £19K | 5 |
| 31 Mar 2018 | £51K | £40K | £45K | £23K | 4 |
Where Hartwell & Son Limited is registered
The registered office is in Northampton (NN3), in the West Northamptonshire local authority area, East Midlands. Show NN3 6WL on a map.
Other trade companies in NN3
- Building Services LtdBuilders
- Cma Constuction Group LtdSpecialist contractors
- Auto Correct Repairs LtdMotor traders
- LCK & Son LimitedLandscapers and gardeners
- Atlas Engeenering LtdCivil engineering
- Oakwell Energy Systems LtdElectricians
- Imdl Construction LtdBuilders
- BC Developments and Construction Group UK LtdProperty developers
Also registered at this address
10 other companies use the same registered office as Hartwell & Son Limited.
- Ashby House Land and Development LimitedProperty developers
- Aspen Brown LimitedBuilders
- Award Stair Fitting LimitedProperty developers
- C.R. Properties LimitedProperty developers
- Form Five Group LimitedBuilders
- Integral Development Solutions LimitedProperty developers
- Kam Construction LimitedSpecialist contractors
- Spheretech LimitedPlumbers and heating engineers
- W&M (Projects) LimitedBuilders
- Wow Exterior Cleaning Services LimitedCleaning companies
What happens if Hartwell & 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 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 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
- 09310577
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 November 2014 (11 years ago)
- Registered office
- Pacioli House 9 Brookfield, Duncan Close, Moulton Park, Northampton, NN3 6WL
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 14 November 2025
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Northampton
Other active plumbing and heating companies registered in Northampton.
- Heat Source Plumbing, Heating & Renewable Energy Limited2016
- Heatex Gas Solutions Ltd2026
- Heaton Plumbing & HTG Ltd2026
- High Acre Developments Limited2014
- Hogben Plumbing and Heating Limited2021
- Holywell Heating Ltd2026
- Hunsbury Heating Ltd2018
- Hunter Heating Ltd2024
All plumbing and heating companies in Northampton · All trades in Northampton · Plumbers and heating engineers across the UK
Frequently asked questions
When are Hartwell & Son Limited's accounts due?
Hartwell & Son Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Hartwell & Son Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Hartwell & Son Limited still trading?
Hartwell & 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 Hartwell & Son Limited do?
Hartwell & Son Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Hartwell & Son Limited?
Hartwell & Son Limited was incorporated on 14 November 2014, 11 years ago.
What is the penalty if Hartwell & 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 Hartwell & 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.