Updated October 2026/Solar Installation Websites

Top 5 Solar & Renewables web developers in Cardiff

Looking for solar & renewables web developers in Cardiff? Below are 5 agencies worth shortlisting, ordered by how much solar & renewables work they can actually show. Agency rates in Cardiff typically run GBP 200-GBP 550/day, and a business website usually costs £5,000 – £20,000 on the local market. Most solar & renewables sites here are built on WordPress with custom ROI calculator and Next.js for enterprise solar companies; the guide below covers what to ask before you hire.

How this list works. Agencies are ordered by the solar & renewables evidence in their public profiles: published specialisms, platforms and named sector work, so the Cardiff order changes by industry. Tecklogist ranks first. This list is published by Tecklogist; no other agency pays for placement.

The ranking

5 agencies · Solar & Renewables · Cardiff

01

Best overall · Solar & Renewables

Tecklogist

#1 Ranked 2026

Ranked #1 for solar & renewables web projects in Cardiff. Every build starts from: rOI/savings calculator.

Tecklogist builds solar & renewables websites for Cardiff businesses on fixed-price, fixed-timeline projects: solar panel website design, solar installation company website, renewable energy web development. You own the code and content at handover, and every project includes 30 days of post-launch support.

  • Fixed price & timeline
  • Reply within 24h
  • You own the code
  • 10-49 staff
Get a free solar & renewables quote[email protected]
  1. 02

    Ditto Digital

    dittodigital.co.uk

    Cardiff full-service digital agency for Welsh and UK national clients.

    Solar & Renewables fit: Relevant solar & renewables signals in its public profile: wordpress, with. Ask for live solar & renewables website examples before shortlisting.

    Web DesignSEOWordPressDigital Marketing

    Best for Cardiff and South Wales businesses wanting bilingual Welsh-English WordPress builds with ICO compliance

  2. 03

    Yellow Spider Web Design

    yellowspider.co.uk

    Cardiff local WordPress studio for South Wales small businesses.

    Solar & Renewables fit: Relevant solar & renewables signals in its public profile: wordpress, with. Ask for live solar & renewables website examples before shortlisting.

    WordPressWeb DesignSEOBilingual Welsh-English

    Best for Cardiff and South Wales small businesses wanting affordable bilingual Welsh-English WordPress builds

  3. 04

    Box UK

    boxuk.com

    Cardiff bespoke software and web application development agency.

    Solar & Renewables fit: Relevant solar & renewables signals in its public profile: with, custom. Ask for live solar & renewables website examples before shortlisting.

    PHPLaravelBespoke SoftwareWeb Apps

    Best for Cardiff and UK clients building complex bespoke PHP or Laravel web applications and platforms

  4. 05

    Freshwater Agency

    freshwater-uk.com

    Cardiff PR and digital communications agency for Welsh organisations.

    Solar & Renewables fit: Generalist studio with no published solar & renewables specialism. Worth considering for broader builds; ask for comparable solar & renewables website work first.

    Digital PRContent MarketingWeb DesignCrisis Comms

    Best for Cardiff and Welsh public authorities and large employers wanting integrated digital PR and web communication builds

All sectorsWeb developers in CardiffNeed an app too?Browse app developers by industry

How to choose a solar & renewables web developer

Before you sign with any solar & renewables web developer in Cardiff, check these points in the first call. Good teams answer them with live examples rather than promises.

  1. 01

    ROI/savings calculator

  2. 02

    Accreditation badges with verification links

  3. 03

    Case study pages with before/after bills, system size, installation timeline, and verified Google review

  4. 04

    Finance/payment option page

  5. 05

    Postcode/state eligibility checker for government incentives

What a solar & renewables website costs in Cardiff

Indicative ranges as of October 2026. Scope, platform and integrations move the price.

Business website

Cardiff market£5,000 – £20,000

Tecklogistfrom £799

3–6 weeks

E-commerce store

Cardiff market£10,000 – £45,000

Tecklogistfrom £1,499

4–10 weeks

Custom web app

Cardiff market£20,000 – £120,000

Tecklogistfrom £2,999

8–20 weeks

How we build your solar & renewables website

  1. 01

    Discovery & brief

    Your goals, Cardiff competitors, audience and the integrations your site needs, mapped before any design starts.

  2. 02

    Design & prototype

    A clickable prototype you review on a real device before code, with solar & renewables conventions built in.

  3. 03

    Build & integrate

    Built on the agreed platform, connected to your CRM, payments, booking or inventory, and tested across devices.

  4. 04

    Launch & support

    A go-live planned to protect your Cardiff rankings, then 30 days of fixes, updates and monitoring.

The solar & renewables market in Cardiff

Cardiff businesses commissioning websites typically pay agency rates of GBP 200-GBP 550/day. For solar & renewables projects, the agencies worth shortlisting are the ones that can show live solar & renewables work, not just a generic portfolio.

BBC Wales' Cardiff Bay headquarters is home to the production teams behind Doctor Who, Sherlock, and Casualty – making Cardiff one of the UK's top-three television production centres. The BBC's Cardiff presence employs 1,200 people and has seeded a post-production, VFX, and interactive media cluster of 80+ companies in the adjacent Creative Quarter.

1,200
BBC Wales employees in Cardiff Bay – anchor of the Creative Quarter cluster
GBP 1.4bn
Welsh Government Digital Strategy investment programme
GBP 200-550/day
Cardiff agency day rate range

Recent work from Tecklogist

wdsfinance.com
Accountancy firm website by Tecklogist

Finance · Web design

Accountancy firm website

sadiqbrothers.pk
5,000-product online store by Tecklogist

Retail · E-commerce

5,000-product online store

clinic website
Medical practice website by Tecklogist

Healthcare · Web design

Medical practice website

Solar & Renewables web development in Cardiff: FAQs

How much does a solar & renewables website cost in Cardiff?+

In Cardiff, a business website typically costs £5,000 – £20,000, while a custom web app runs £20,000 – £120,000. Agency day rates of GBP 200-GBP 550/day are the main driver, followed by integrations and how much custom functionality you need. Tecklogist quotes solar & renewables projects from from £799 at a fixed price.

How long does it take to build a solar & renewables website?+

A business website usually takes 3–6 weeks; a custom web app takes 8–20 weeks. Delays almost always come from late content, unclear scope or third-party integrations, so agree those before work starts.

Which platform is best for solar & renewables websites?+

The usual options are WordPress with custom ROI calculator and Next.js for enterprise solar companies. The right one depends on how often your team edits content, which systems the site must connect to and your budget, so be wary of any Cardiff agency that recommends the same platform for every client.

What should I ask a solar & renewables web developer in Cardiff before hiring?+

Ask about rOI/savings calculator; accreditation badges with verification links; case study pages with before/after bills, system size, installation timeline, and verified Google review. Then ask for two or three live solar & renewables websites they built, who will actually work on yours, and what support looks like after launch.

Why is Tecklogist ranked first on this list?+

This list is published by Tecklogist, and we rank ourselves first because solar & renewables websites are core work for us: fixed prices, fixed timelines and code you own. The other Cardiff agencies are ordered by the solar & renewables evidence in their public profiles, and none of them pay to appear.

Ready to start your solar & renewables project?

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