- Companies
- Civil engineering
- Newbury
- Solarthree Ltd
Solarthree Ltd
- Company number
- 12602707
- Incorporated
- 14 May 20206 years trading
- Registered office
- 2 Toomers Wharf, Canal Walk, Newbury, RG14 1DY
- Nature of business
- Construction of utility projects for electricity and telecommunications; Environmental consulting activities
Solarthree Ltd is a 6-year-old private limited company registered in Newbury, company number 12602707, one of 18 civil engineering contractors in Newbury. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
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 Solarthree 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 £11K (-133.8%) on the year before, to -£19K.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £16K against £103K owed within a year: 0.2 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2020 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | -£19K | £16K | £103K | 1 | |
| 31 Dec 2023 | -£8,257 | £15K | £92K | 1 | |
| 31 Dec 2022 | -£74K | £89K | 1 | ||
| 31 Dec 2021 | -£1,400 | £1,500 | 1 | ||
| 31 Dec 2020 | -£300 | £480 | 1 |
Where Solarthree Ltd is registered
The registered office is in Newbury (RG14), in the West Berkshire local authority area, South East. Show RG14 1DY on a map.
Other trade companies in RG14
- Budova LtdCivil engineering
- Keystone Commercial Design LtdBuilders
- Sama Properties LtdProperty developers
- Waymarc LimitedMotor traders
- Dorneywood Consulting LimitedProperty developers
- Fortis One LimitedProperty developers
- Startech Auto Care LtdMechanics and garages
- Atl Premium Cleaning & Painting Services LtdPainters and decorators
Shared registered office
46 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 Solarthree 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 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
- 12602707
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 May 2020 (6 years ago)
- Registered office
- 2 Toomers Wharf, Canal Walk, Newbury, RG14 1DY
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Environmental consulting activities (SIC 74901) - Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 10 October 2025
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 in Newbury
Other active civil engineering contractors registered in Newbury.
- Still Water Revival Ltd2023
- Usefulalus Limited2021
- 1ST Choice Traffic Management Limited2011
- Ajh Highway Services Ltd2023
- BJT Mechanical Solutions Limited2017
- Budova Ltd2026
- Henvi Surfacing Limited2026
- Makjon Consult Limited2015
All civil engineering contractors in Newbury · All trades in Newbury · Civil engineering across the UK
Frequently asked questions
When are Solarthree Ltd's accounts due?
Solarthree Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Solarthree Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 December 2025, due by 31 December 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 Solarthree Ltd still trading?
Solarthree 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 Solarthree Ltd do?
Solarthree Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Environmental consulting activities (SIC 74901).
How old is Solarthree Ltd?
Solarthree Ltd was incorporated on 14 May 2020, 6 years ago.
What is the penalty if Solarthree 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 Solarthree 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.