- Companies
- Plumbers and heating engineers
- Northampton
- S J Building Group Limited
S J Building Group Limited
- Company number
- 11779859
- Incorporated
- 22 Jan 20197 years trading
- Registered office
- 21 Market Place, Long Buckby, Northampton, NN6 7RR
- Nature of business
- Plumbing, heat and air-conditioning installation; Other building completion and finishing
S J Building Group Limited is a 7-year-old private limited company registered in Northampton, company number 11779859, 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 up £8,642 (+83.4%) on the year before, to £19K.
- Net assets rose in 4 of 6 year-on-year comparisons on record.
- Current assets of £19K against £20K owed within a year: 1.0 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 7 years, 2020 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £19K | £19K | £20K | 1 | |
| 31 Mar 2025 | £10K | £20K | £34K | 1 | |
| 31 Mar 2024 | £14K | £36K | £15K | 1 | |
| 31 Mar 2023 | £7,345 | £35K | £12K | 2 | |
| 31 Mar 2022 | -£20K | £17K | £12K | 2 | |
| 31 Mar 2021 | -£20K | £27K | £13K | 2 | |
| 31 Mar 2020 | £8,113 | -£4,468 | £17K | 2 |
Where S J Building Group Limited is registered
The registered office is in Northampton (NN6), in the West Northamptonshire local authority area, East Midlands. Show NN6 7RR on a map.
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- Wav Sales LimitedMotor traders
- Crease Lightening LimitedCleaning companies
- Noah Landscaping & Grounds Maintenance LtdLandscapers and gardeners
- A3 Exterior Cleaning LimitedCleaning companies
- JR Garden Solutions LtdLandscapers and gardeners
- Benbow Gardens LtdProperty developers
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Also registered at this address
17 other companies use the same registered office as S J Building Group Limited.
- A Grade Building Solutions LtdBuilders
- Ashway Civil Engineering LtdSpecialist contractors
- DT Services (Northampton) LimitedPlumbers and heating engineers
- Gabs Heating and Plumbing Solutions LimitedPlumbers and heating engineers
- J B Carpentry & Kitchens LtdJoiners and carpenters
- Jab Spares LimitedMotor traders
- Jojo Pablo LimitedGlaziers
- Kinder Cabins LtdBuilders
- Kingswell Construction LimitedProperty developers
- LMC Electrical and Property Services LtdElectricians
- Michael David Cars LimitedMotor traders
- Northampton Bathrooms LimitedFinishing trades
- Northants Ground Maintenance LtdFinishing trades
- One for Groundwork’S LtdCivil engineering
- RJC Windows (Northampton) LtdGlaziers
- Snol Lifting LimitedSpecialist contractors
- Vale Electrical (Northampton) LimitedElectricians
What happens if S J Building Group 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
- 11779859
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 January 2019 (7 years ago)
- Registered office
- 21 Market Place, Long Buckby, Northampton, NN6 7RR
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Other building completion and finishing (SIC 43390) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 6 January 2026
- Previous names
- S J Building, Plumbing and Heating Limited (until 25 May 2022)
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.
- S&T Building & Maintenance Ltd2026
- S.P. Marks Services Ltd.1996
- SB Plumbing Northampton Ltd2025
- SBK (Northampton) Limited1992
- Sig Plumbing Ltd2024
- SJB Plumbing & Heating Limited2024
- Spheretech Limited2014
- Statom Renovations Ltd2023
All plumbing and heating companies in Northampton · All trades in Northampton · Plumbers and heating engineers across the UK
Frequently asked questions
When are S J Building Group Limited's accounts due?
S J Building Group 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 S J Building Group 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 S J Building Group Limited still trading?
S J Building Group 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 S J Building Group Limited do?
S J Building Group Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Other building completion and finishing (SIC 43390).
How old is S J Building Group Limited?
S J Building Group Limited was incorporated on 22 January 2019, 7 years ago.
What is the penalty if S J Building Group 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 S J Building Group 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.