- Companies
- Specialist contractors
- Bath
- Isopleth Ltd
Isopleth Ltd
- Company number
- 09150373
- Incorporated
- 28 Jul 201412 years trading
- Registered office
- Lower Ground Floor Office, 6 Gay Street, Bath, BA1 2PH
- Nature of business
- Other specialised construction activities n.e.c.
Isopleth Ltd is a 12-year-old private limited company registered in Bath, company number 09150373, one of 46 specialist construction companies in Bath. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 31 July 2026 is due at HMRC on 31 July 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 £62K (+46.7%) on the year before, to £194K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £340K against £152K owed within a year: 2.2 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jul 2026 | £194K | £340K | £152K | 0 | |
| 31 Jul 2025 | £132K | £279K | £154K | 1 | |
| 31 Jul 2024 | £172K | £254K | £87K | 1 | |
| 31 Jul 2023 | £156K | £257K | £107K | 1 | |
| 31 Jul 2022 | £145K | £276K | £137K | 1 | |
| 31 Jul 2021 | £191K | £223K | £37K | 1 | |
| 31 Jul 2020 | £166K | £192K | £32K | 1 | |
| 31 Jul 2019 | £192K | £205K | £247K | £58K | |
| 31 Jul 2018 | £151K | £187K | £220K | £70K | |
| 31 Jul 2017 | £69K | £125K | £57K |
Where Isopleth Ltd is registered
The registered office is in Bath (BA1), in the Bath and North East Somerset local authority area, South West. Show BA1 2PH on a map.
Other trade companies in BA1
- Kindway 24 LtdCleaning companies
- 4TH Generation Builders of Bath LtdBuilders
- 86 Electrics LtdElectricians
- Rosemark Property Cleaning LtdCleaning companies
- Revon Assist Solutions LtdMotor traders
- Prentice Brothers LtdFinishing trades
- Bath Electrical & Renewables LtdElectricians
- Praedium Property Holdings LtdBuilders
What happens if Isopleth 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 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 09150373
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 July 2014 (12 years ago)
- Registered office
- Lower Ground Floor Office, 6 Gay Street, Bath, BA1 2PH
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 July (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 28 July 2026
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 Bath
Other active specialist construction companies registered in Bath.
- JD Building (Maintenance) Ltd2021
- John Cooper Building Services (Bath) Limited2006
- Kilpin & Co. Ltd2025
- Maka Consulting Ltd2025
- Mantaray (Bath) Ltd2002
- McCaffer Limited2026
- Meadgate Recovery Services Limited1988
- Mechanical Electrical Engineering Services Limited2006
All specialist construction companies in Bath · All trades in Bath · Specialist contractors across the UK
Frequently asked questions
When are Isopleth Ltd's accounts due?
Isopleth Ltd's next accounts are due at Companies House by 30 April 2027 (in 200 days), covering the period to 31 July 2026.
When is Isopleth Ltd's CT600 due?
The CT600 for the period to 31 July 2026 is due at HMRC by 31 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is Isopleth Ltd still trading?
Isopleth 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 Isopleth Ltd do?
Isopleth Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Isopleth Ltd?
Isopleth Ltd was incorporated on 28 July 2014, 12 years ago.
What is the penalty if Isopleth 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 Isopleth 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.