- Companies
- Specialist contractors
- London
- John Simpson Architects Ltd
John Simpson Architects Ltd
- Company number
- 09143766
- Incorporated
- 23 Jul 201412 years trading
- Registered office
- 50 Belsize Park, London, NW3 4EE
- Nature of business
- Other specialised construction activities n.e.c.
John Simpson Architects Ltd is a 12-year-old private limited company registered in London, company number 09143766, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 25 June 2027, and the CT600 for the period to 25 September 2026 is due at HMRC on 25 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 £202K (+130.8%) on the year before, to £47K.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £1M against £1M owed within a year: 1.0 times cover.
- 10 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 |
|---|---|---|---|---|---|
| 25 Sep 2025 | £47K | £4,005 | £1M | £1M | 10 |
| 25 Sep 2024 | -£154K | £4,041 | £1.1M | £1.2M | 10 |
| 25 Sep 2023 | -£127K | £4,063 | £1M | £1.1M | 10 |
| 26 Sep 2022 | -£192K | £3,834 | £919K | £1M | 10 |
| 26 Sep 2021 | -£117K | £4,597 | £910K | £834K | 10 |
| 26 Sep 2020 | -£8,112 | £24K | £778K | £789K | 10 |
| 27 Sep 2019 | £32K | £112K | £812K | £785K | 10 |
| 28 Sep 2018 | £49K | £18K | £1.4M | £1.4M | 3 |
| 30 Sep 2017 | £57K | £1.4M | £1.4M | 3 | |
| 30 Sep 2016 | £18K | £181K | £1.1M | £1.2M |
Where John Simpson Architects Ltd is registered
The registered office is in London (NW3), in the Camden local authority area, London. Show NW3 4EE on a map.
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Also registered at this address
1 other company uses the same registered office as John Simpson Architects Ltd.
- John Simpson Architects International LimitedSpecialist contractors
What happens if John Simpson Architects 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 25 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 26 Jun 2027 to 25 Jul 2027 | £150 |
| 1 to 3 months late | 26 Jul 2027 to 25 Sep 2027 | £375 |
| 3 to 6 months late | 26 Sep 2027 to 25 Dec 2027 | £750 |
| More than 6 months late | From 26 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 26 Sep 2027 | £200 |
| 3 months late | 25 Dec 2027 | another £200 |
| 6 months late | 25 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 25 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
- 09143766
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 July 2014 (12 years ago)
- Registered office
- 50 Belsize Park, London, NW3 4EE
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 25 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 25 September 2025
- Last confirmation statement
- 27 June 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
- Previous names
- JS Architectural Ltd (until 27 Oct 2014)
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in London
Other active specialist construction companies registered in London.
- Johny Best Services Ltd2024
- Joint Stock Limited2012
- Jokayos Ventures Limited2017
- Jon Bradley Limited2002
- Jonathan Martin Watts Ltd2014
- Jonathan Miller Property Services Limited2025
- Jones Safety Consultants Limited2014
- Jopson Consultants Limited2024
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are John Simpson Architects Ltd's accounts due?
John Simpson Architects Ltd's next accounts are due at Companies House by 25 June 2027 (in 256 days), covering the period to 25 September 2026.
When is John Simpson Architects Ltd's CT600 due?
The CT600 for the period to 25 September 2026 is due at HMRC by 25 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 26 June 2027.
Is John Simpson Architects Ltd still trading?
John Simpson Architects 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 John Simpson Architects Ltd do?
John Simpson Architects Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is John Simpson Architects Ltd?
John Simpson Architects Ltd was incorporated on 23 July 2014, 12 years ago.
What is the penalty if John Simpson Architects 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 John Simpson Architects 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.