- Companies
- Builders
- Welwyn Garden City
- Dolphin Civil Engineering Ltd
Dolphin Civil Engineering Ltd
- Company number
- 08891038
- Incorporated
- 12 Feb 201412 years trading
- Registered office
- Albany Chambers, 26 Bridge Road East, Welwyn Garden City, AL7 1HL
- Nature of business
- Construction of commercial buildings; Construction of other civil engineering projects n.e.c.; Other specialised construction activities n.e.c.
Dolphin Civil Engineering Ltd is a 12-year-old private limited company registered in Welwyn Garden City, company number 08891038, one of 53 building contractors in Welwyn Garden City. 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.
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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 £156K (+34.8%) on the year before, to £605K.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £1.2M against £769K owed within a year: 1.6 times cover.
- 33 employees on average, down from 34 the year before.
- Balance sheets on record for 10 years, 2018 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2026 | £605K | £762K | £1.2M | £769K | 33 |
| 28 Feb 2025 | £449K | £918K | £1.4M | £1.1M | 34 |
| 28 Feb 2024 | £324K | £450K | £1.3M | £1.1M | 34 |
| 28 Feb 2023 | £212K | £379K | £763K | £524K | 35 |
| 28 Feb 2022 | £125K | £399K | £399K | £223K | 32 |
| 28 Feb 2021 | £64K | £360K | £360K | £233K | 20 |
| 28 Feb 2020 | £17K | £58K | £41K | 6 | |
| 28 Feb 2019 | £1 | ||||
| 1 Mar 2018 | £1 | ||||
| 28 Feb 2018 | £1 |
Where Dolphin Civil Engineering Ltd is registered
The registered office is in Welwyn Garden City (AL7), in the Welwyn Hatfield local authority area, East of England. Show AL7 1HL on a map.
Other trade companies in AL7
- Mechanicalwise LtdInstallers
- Azalea Services LimitedSpecialist contractors
- Malmech and Mannion LimitedMechanics and garages
- T&D Construction Group LtdFinishing trades
- Vertec Roofing and Building LtdRoofers
- Selectlane LtdMotor traders
- Af Pressure Washing LtdCleaning companies
- Jet Professional LtdCleaning companies
What happens if Dolphin Civil Engineering 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
- 08891038
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 February 2014 (12 years ago)
- Registered office
- Albany Chambers, 26 Bridge Road East, Welwyn Garden City, AL7 1HL
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of other civil engineering projects n.e.c. (SIC 42990)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 28 February (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 12 September 2026
- Previous names
- Plexwood Technologies Limited (until 12 Sep 2019)
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Welwyn Garden City
Other active building contractors registered in Welwyn Garden City.
- Driveway Pro Solutions Ltd2024
- Eco Smart Installations Limited2022
- Elmwood PM Ltd2011
- Esa Spread Development Limited2018
- Footings Limited2024
- G Way Contracts Ltd2019
- Gidi Ltd2025
- Ground Construction Plant Hire Limited2011
All building contractors in Welwyn Garden City · All trades in Welwyn Garden City · Builders across the UK
Frequently asked questions
When are Dolphin Civil Engineering Ltd's accounts due?
Dolphin Civil Engineering Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is Dolphin Civil Engineering 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 Dolphin Civil Engineering Ltd still trading?
Dolphin Civil Engineering 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 Dolphin Civil Engineering Ltd do?
Dolphin Civil Engineering Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of other civil engineering projects n.e.c. (SIC 42990); Other specialised construction activities n.e.c. (SIC 43999).
How old is Dolphin Civil Engineering Ltd?
Dolphin Civil Engineering Ltd was incorporated on 12 February 2014, 12 years ago.
What is the penalty if Dolphin Civil Engineering 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 Dolphin Civil Engineering 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.