- Companies
- Civil engineering
- RTH Builders Limited
RTH Builders Limited
- Company number
- 04913956
- Incorporated
- 29 Sep 200323 years trading
- Registered office
- John Phillips & Co Ltd, 81 Centaur Court Claydon, Business Park Great Blakenham, Ipswich Suffolk, IP6 0NL
- Nature of business
- Construction of other civil engineering projects n.e.c.
RTH Builders Limited is a 23-year-old private limited company registered in Business Park Great Blakenham, company number 04913956, one of the UK's civil engineering contractors. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 30 September 2026.
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 £2,243 (+44.5%) on the year before, to £7,279.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £30K against £24K owed within a year: 1.3 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 10 years, 2015 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2024 | £7,279 | £30K | £24K | 1 | |
| 30 Sep 2023 | £5,036 | £28K | £24K | 1 | |
| 30 Sep 2022 | £7,705 | £21K | £15K | 1 | |
| 30 Sep 2021 | £18K | £20K | £4,455 | 1 | |
| 30 Sep 2020 | £28K | £31K | £6,560 | 1 | |
| 30 Sep 2019 | £18K | £18K | £3,482 | 0 | |
| 30 Sep 2018 | £17K | £20K | £2,354 | ||
| 30 Sep 2017 | £24K | £26K | £29K | £6,151 | 1 |
| 30 Sep 2016 | £15K | £28K | £13K | ||
| 30 Sep 2015 | £15K | £31K | £16K |
Where RTH Builders Limited is registered
The registered office is in Business Park Great Blakenham (IP6), in the Mid Suffolk local authority area, East of England. Show IP6 0NL on a map.
Other trade companies in IP6
- CDV Thorpe Lodge LimitedProperty developers
- 11:11 Automotive LtdMotor traders
- JS Fire and Intrusion Solutions LtdElectricians
- Lakeview Cars LimitedMotor traders
- LG Contractors LtdCivil engineering
- Concentric Plumbing & Mechanical LtdPlumbers and heating engineers
- CJW Coastal Plumbing and Heating LtdPlumbers and heating engineers
- Ajh Design and Build LtdJoiners and carpenters
Shared registered office
31 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 RTH Builders 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 04913956
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 September 2003 (23 years ago)
- Registered office
- John Phillips & Co Ltd, 81 Centaur Court Claydon, Business Park Great Blakenham, Ipswich Suffolk, IP6 0NL
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2024
- Last confirmation statement
- 29 September 2025
- Previous names
- RTH Builders Limtied (until 21 Nov 2009)
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies
Other active civil engineering contractors.
Frequently asked questions
When are RTH Builders Limited's accounts due?
RTH Builders Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is RTH Builders Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 30 September 2025, due by 30 September 2026, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is RTH Builders Limited still trading?
RTH Builders 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 RTH Builders Limited do?
RTH Builders Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is RTH Builders Limited?
RTH Builders Limited was incorporated on 29 September 2003, 23 years ago.
What is the penalty if RTH Builders 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 RTH Builders 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.