- Companies
- Finishing trades
- Birmingham
- Master Windows JB Ltd
Master Windows JB Ltd
- Company number
- 11216516
- Incorporated
- 21 Feb 20188 years trading
- Registered office
- 11 Portland Road, Edgbaston, Birmingham, West Midlands, B16 9HN
- Nature of business
- Other building completion and finishing
Master Windows JB Ltd is a 8-year-old private limited company registered in Birmingham, company number 11216516, one of 422 building finishing companies in Birmingham. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Master Windows JB LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £848 (-6.2%) on the year before, to -£15K.
- Net assets rose in 1 of 6 year-on-year comparisons on record.
- Current assets of £33K against £42K owed within a year: 0.8 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | -£15K | £33K | £42K | 2 | |
| 28 Feb 2024 | -£14K | £14K | £30K | 2 | |
| 28 Feb 2023 | -£4,504 | £22K | £30K | 1 | |
| 28 Feb 2022 | £9,605 | £25K | £24K | 1 | |
| 28 Feb 2021 | £5,349 | £2,987 | £11K | 1 | |
| 28 Feb 2020 | £5,454 | £2,940 | £15K | 1 | |
| 28 Feb 2019 | £9,122 | £2,057 | £2,057 | £16K |
Where Master Windows JB Ltd is registered
The registered office is in Birmingham (B16), in the Birmingham local authority area, West Midlands. Show B16 9HN on a map.
Other trade companies in B16
- MD Modern Tiles LtdFinishing trades
- Landkite LtdProperty developers
- Goldspire Property Holdings LtdProperty developers
- Ahpbala Construction LtdPlasterers
- Priority One Maintenance LtdPlasterers
- Doxservice LtdPlasterers
- Midwest Interior Solutions LtdFinishing trades
- Boost Automotive LimitedMotor traders
Shared registered office
61 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Master Windows JB Ltd 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 11216516
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 February 2018 (8 years ago)
- Registered office
- 11 Portland Road, Edgbaston, Birmingham, West Midlands, B16 9HN
- Nature of business
- Other building completion and finishing (SIC 43390)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 20 February 2026
- Previous names
- Smart Conservatories & Construction Ltd (until 18 Dec 2019)
Filing notes for building finishing companies
Finishing trade companies cover a wide range of work. Most are micro-entities with simple accounts and a straightforward CT600.
Similar companies in Birmingham
Other active building finishing companies registered in Birmingham.
- Mastercraft Refurb Limited2026
- Mba Building Services Ltd2019
- MBS Magic Building Services Ltd2026
- MD Modern Tiles Ltd2026
- Mender Mate Ltd2025
- Meridian Works Ltd2026
- MF Building Services Limited2023
- MGB Building Repair and Maintenance Ltd2021
All building finishing companies in Birmingham · All trades in Birmingham · Finishing trades across the UK
Frequently asked questions
When are Master Windows JB Ltd's accounts due?
Master Windows JB Ltd's next accounts are due at Companies House by 30 November 2026 (in 49 days), covering the period to 28 February 2026.
When is Master Windows JB Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Master Windows JB Ltd still trading?
Master Windows JB Ltd 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 Master Windows JB Ltd do?
Master Windows JB Ltd is registered under Other building completion and finishing (SIC 43390).
How old is Master Windows JB Ltd?
Master Windows JB Ltd was incorporated on 21 February 2018, 8 years ago.
What is the penalty if Master Windows JB Ltd 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 Master Windows JB Ltd 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.