- Companies
- Plumbers and heating engineers
- Cambridge
- Smartplumb Limited
Smartplumb Limited
- Company number
- 04748293
- Incorporated
- 29 Apr 200323 years trading
- Registered office
- 95 New Road, Haslingfield, Cambridge, Cambridgeshire, CB3 7LP
- Nature of business
- Plumbing, heat and air-conditioning installation
Smartplumb Limited is a 23-year-old private limited company registered in Cambridge, company number 04748293, one of 105 plumbing and heating companies in Cambridge. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 down £11K (-41.1%) on the year before, to £16K.
- Current assets of £14K against £6,352 owed within a year: 2.2 times cover.
- 2 employees on average during the year.
- 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 May 2025 | £16K | £14K | £6,352 | 2 | |
| 31 May 2024 | £27K | £21K | £4,991 | 2 | |
| 31 May 2023 | £17K | £26K | £9,023 | 2 |
Where Smartplumb Limited is registered
The registered office is in Cambridge (CB3), in the Cambridge local authority area, England. Show CB3 7LP on a map.
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What happens if Smartplumb 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 04748293
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 April 2003 (23 years ago)
- Registered office
- 95 New Road, Haslingfield, Cambridge, Cambridgeshire, CB3 7LP
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 15 May 2026
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 Cambridge
Other active plumbing and heating companies registered in Cambridge.
- Spaxman Plumbing & Heating Ltd2012
- Speedfixplumbing Ltd2024
- Speedy Plumbing & Drain Ltd2026
- ST Ives Heating & Plumbing Limited2025
- Starling Plumbing & Heating Ltd2011
- Techmanoncall Ltd2022
- The Cambridgeshire Plumbing Company Ltd2019
- The Plumbing Company Limited2002
All plumbing and heating companies in Cambridge · All trades in Cambridge · Plumbers and heating engineers across the UK
Frequently asked questions
When are Smartplumb Limited's accounts due?
Smartplumb Limited's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is Smartplumb Limited's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Smartplumb Limited still trading?
Smartplumb 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 Smartplumb Limited do?
Smartplumb Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Smartplumb Limited?
Smartplumb Limited was incorporated on 29 April 2003, 23 years ago.
What is the penalty if Smartplumb 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 Smartplumb 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.