- Companies
- Builders
- Milton Keynes
- S J I Building Maintenance Limited
S J I Building Maintenance Limited
- Company number
- 06386929
- Incorporated
- 2 Oct 200719 years trading
- Registered office
- Ground Floor, Baird House Seebeck Place, Knowlhill, Milton Keynes, Buckinghamshire, MK5 8FR
- Nature of business
- Construction of domestic buildings
S J I Building Maintenance Limited is a 19-year-old private limited company registered in Milton Keynes, company number 06386929, one of 358 building contractors in Milton Keynes. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £73K (+4.9%) on the year before, to £1.6M.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £1.8M against £366K owed within a year: 5.0 times cover.
- 13 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 |
|---|---|---|---|---|---|
| 30 Sep 2025 | £1.6M | £1.3M | £1.8M | £366K | 13 |
| 30 Sep 2024 | £1.5M | £1.2M | £1.8M | £397K | 13 |
| 30 Sep 2023 | £1.4M | £1.2M | £1.8M | £475K | 14 |
| 30 Sep 2022 | £1M | £643K | £1.5M | £584K | 13 |
| 30 Sep 2021 | £638K | £487K | £1.1M | £467K | 10 |
| 30 Sep 2020 | £399K | £214K | £658K | £290K | 9 |
| 30 Sep 2019 | £327K | £250K | £561K | £272K | 8 |
| 30 Sep 2018 | £310K | £156K | £510K | £251K | 11 |
| 30 Sep 2017 | £308K | £168K | £406K | £152K | 10 |
| 30 Sep 2016 | £323K | £152K | £544K | £270K |
Public contracts won
S J I Building Maintenance Limited has 5 public sector contract awards on record; the ones with their own published value total £205K, from 2017 to 2018. Source: Contracts Finder and Find a Tender award notices. 2 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Bpha Limited5 awards
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Bpha Limited | Window Replacements at Rothsay Place & Hurst Grove, Bedford | £62K | 14 Feb 2018 |
| Bpha Limited | External Wall Insulation at Various Properties Within Bedford Borough | £51K | 14 Feb 2018 |
| Bpha Limited | bpha Window Replacement & Associated Works (Leaseholder Properties) | £92K | 27 Nov 2017 |
| Bpha Limited | Window & Door Replacement 2017-19 (Contract Lot 2) | 5 May 2017 | |
| Bpha Limited | Kitchen and Bathroom Replacements 2017-19 Contract Lot 2 | 30 Mar 2017 |
Where S J I Building Maintenance Limited is registered
The registered office is in Milton Keynes (MK5), in the Milton Keynes local authority area, South East. Show MK5 8FR on a map.
Other trade companies in MK5
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- Lajoy LimitedCleaning companies
- Indf7 Investments LimitedProperty developers
- Barnes Electrical MK LtdElectricians
- Gleam and Flow LtdCleaning companies
- Francis the Handyman LimitedInstallers
- DBC Services & Renewables LtdProperty developers
- Grand Royale Cars LimitedMotor traders
Also registered at this address
20 other companies use the same registered office as S J I Building Maintenance Limited.
- Butterfield's Recovery Ltd.Mechanics and garages
- DBC Contracting LimitedProperty developers
- DBC Services & Renewables LtdProperty developers
- DKD Building Services LimitedBuilders
- Farm Garages LimitedMotor traders
- Floorscreed (UK) LimitedFloor and wall tilers
- Henlow Camp Property Co. LimitedProperty developers
- HJK Auto Services LimitedMechanics and garages
- Hurley Electrical Contractors LimitedElectricians
- J S J Roofing LtdRoofers
- Jsi Property LimitedBuilders
- Manor Roofing (Herts) LimitedRoofers
- Marshall Shopfitters LimitedInstallers
- Nawc LimitedFinishing trades
- R.M.S. Decoration LimitedPainters and decorators
- Retro Management LimitedProperty developers
- Siju LimitedProperty developers
- T & L Flooring LimitedFloor and wall tilers
- Thermotech Plumbing & Heating Services LimitedPlumbers and heating engineers
- Wolfwood Consulting LimitedBuilders
What happens if S J I Building Maintenance 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 06386929
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 2 October 2007 (19 years ago)
- Registered office
- Ground Floor, Baird House Seebeck Place, Knowlhill, Milton Keynes, Buckinghamshire, MK5 8FR
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 2 October 2025
- Charges (mortgages)
- 1 outstanding of 1 registered
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Milton Keynes
Other active building contractors registered in Milton Keynes.
- Sanfair Constructions Ltd2018
- Sangha Construction Group Ltd2024
- SDMK Build Services Ltd2024
- SGV Styledge Limited2019
- SH Crown Ltd2024
- Shenley Lodge Developments Limited2001
- Signature Land Ltd2017
- Six Home Improvements Ltd2023
All building contractors in Milton Keynes · All trades in Milton Keynes · Builders across the UK
Frequently asked questions
When are S J I Building Maintenance Limited's accounts due?
S J I Building Maintenance Limited's next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is S J I Building Maintenance Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is S J I Building Maintenance Limited still trading?
S J I Building Maintenance 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 I Building Maintenance Limited do?
S J I Building Maintenance Limited is registered under Construction of domestic buildings (SIC 41202).
How old is S J I Building Maintenance Limited?
S J I Building Maintenance Limited was incorporated on 2 October 2007, 19 years ago.
Has S J I Building Maintenance Limited won public sector contracts?
Yes. S J I Building Maintenance Limited has 5 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £205K), most recently from BPHA LIMITED.
What is the penalty if S J I Building Maintenance 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 I Building Maintenance 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.