Building Construction and Renewable Energy Installers in Cardiff

Solar panel installers, heat pump engineers, insulation fitters and builders working across Cardiff and South Wales. Local surveys, fixed-price quotes, and every job carried out by our own accredited team rather than a subcontracted local partner.

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Services in Cardiff

Every service below is carried out in Cardiff by our own team, from CF postcodes in the city out to Penarth, Barry, Caerphilly and Newport.

Air Source Heat Pumps in Cardiff

MCS certified air source heat pump installation for homes and businesses, fitted by our own engineers. Every system is sized from a room-by-room heat loss survey, so it keeps every room warm and runs as efficiently as it was designed to, all year round.

Commercial Maintenance in Cardiff

Planned preventative maintenance for offices, shops and commercial buildings. Our in-house team services heating, electrics and building fabric on a fixed PPM schedule across your sites, so small faults are fixed early and your premises stay open.

External Wall Insulation in Cardiff

Solid wall insulation for older homes, fitted to the outside of the house and finished with a new render. Our own installers cut the heat lost through your walls, protect the brickwork from the weather and give the exterior a clean, modern finish.

Full Home Renovation in Cardiff

A full home renovation planned and delivered by one team, from structural work, rewiring and new heating to kitchens, bathrooms, floors and decorating. You get one fixed-price quote, a staged programme and one point of contact from survey to handover.

Heating Upgrades in Cardiff

Complete heating system upgrades for homes and businesses, not just a boiler swap. Our Gas Safe engineers replace boilers, radiators, pipework and controls as one job, giving you a new central heating system that heats every room properly and runs efficiently.

Kitchen Renovations in Cardiff

Kitchen renovations handled from start to finish by one team. We strip out the old kitchen, update the plumbing and electrics, and our own kitchen fitters install your new units and worktops, with one fixed-price quote covering every trade.

Living Room Improvements in Cardiff

Living room improvements that go beyond decorating. We reconfigure the space, build custom media walls, update the lighting and electrics, then replaster and finish the room, all handled by our own in-house team on one fixed-price quote.

Loft Conversions in Cardiff

Loft conversions designed, built and finished by one team, whether that's a Velux, a dormer loft conversion or a hip-to-gable. We check the headroom, structure and stairs first, handle building control, and turn dead roof space into a room you'll actually use.

Loft Insulation in Cardiff

Loft insulation fitted to the recommended depth by our own installers, usually in a single day. We check what's already up there, keep the eaves clear for ventilation, and leave you with a warmer house and less heat escaping through the roof.

Single Storey Extensions in Cardiff

Single storey extensions designed, built and finished by one in-house team. We handle the drawings, planning checks and building control, then build from the foundations to the final coat of paint, on one fixed-price quote.

Solar PV in Cardiff

Solar PV installation designed around your roof, your shading and how you actually use electricity. As MCS certified solar panel installers, we size the system, fit the panels, inverter and battery storage, and sort the paperwork you need to get paid for exports.

Areas we cover around Cardiff

The same in-house team that works in Cardiff covers the towns around it, with the same free survey, fixed-price quote and written workmanship warranty.

NewportBridgendNeathMerthyr Tydfil

Energy Upgrades and Renovations for Cardiff Homes

Many Cardiff homes were built before cavity walls were common. Older terraces in Cathays, Roath and Canton lose heat straight through solid brick, so external wall insulation in Cardiff often does more than a new boiler would. Newer homes in areas like Llanishen and Whitchurch are different. There, loft insulation, solar panels and a heat pump usually give the better return.

Funding is different in Wales too. Wales has its own Warm Homes scheme, and the Boiler Upgrade Scheme for heat pumps covers both England and Wales. We check what applies to your address at the survey, so you know where you stand before you commit.Building work follows Welsh rules as well. Planning and building regulations for extensions and loft conversions are not the same as in England. We confirm what your property is allowed before any drawings are made.

Free local survey across CF postcodes, with no call-out charge
Solar PV, air source heat pumps, insulation and full renovations from one team
Welsh planning, building regulations and funding checked at survey
Also covering Penarth, Barry, Caerphilly, Newport, Bridgend and Merthyr Tydfil

Projects Completed

Solar, heat pump and storage installs delivered across residential and commercial properties.

Years Combined Experience

An accredited team with decades of hands-on energy and construction work behind it.

Industry Accreditations

Independently audited by MCS, TrustMark, Gas Safe and five other industry bodies.

Client Stories

Trusted By Homeowners And Businesses Alike

See how our renewable energy solutions are helping customers reduce costs, increase efficiency, and gain greater energy independence.

Amjid H.

Home Owner

I got my insulation done by greentek they were fantastic from the start. On the way we had one two problems from the contractors but greentek took care of it! Kept me informed and solved the issues. They communicated consistently and kept me in the loop.

Review from Google

★★★★★

Luki

Business Owner

We required an urgent new boiler installation due to the old one breaking down and being unrepairable. Greentek Energy supplied and fitted a new one at very short notice so our tenants could have heating and hot water again. We are very grateful to Greentek Energy and would recommend them highly.

Review from Google

★★★★★

Ian B.

Home Owner

Part of the Ecobility company. the people at Greentek know their stuff. Got a quote in just under 20 minutes where others insisted on coming around the house. They were cheaper too!

Review from Google

★★★★★

Omer M.

Home Owner

Quick and efficient service.

Review from Google

★★★★★

Amjid H.

Home Owner

Review from Google

★★★★★

Luki

Business Owner

Review from Google

★★★★★

Ian B.

Home Owner

Part of the Ecobility company. the people at Greentek know their stuff. Got a quote in just under 20 minutes where others insisted on coming around the house. They were cheaper too!

Review from Google

★★★★★

Omer M.

Home Owner

Quick and efficient service.

Review from Google

★★★★★

Our Process

Four Steps.
Zero Surprises.

From the first call to the final handover, a clear, transparent process designed to deliver solar, home improvement, and renovation work with zero hassle.

STEP 1

Free Survey

Book online or call. A Greentek specialist visits your property to assess your solar, heating, insulation, or renovation needs.

STEP 2

Custom Quote

Get a clear, fixed-price quote with material and brand options, and an honest timeline, no hidden fees.

STEP 3

Expert Installation

Our in-house accredited team carries out the work, solar, heat pump, insulation, or renovation, no subcontractors passing the job around.

STEP 4

Handover & Warranty

We walk you through everything on completion, clean up after ourselves, and hand over your written warranty.

Frequently asked questions

Which areas around Cardiff do you cover?+

As well as Cardiff itself, our in-house team covers Newport, Bridgend, Neath and Merthyr Tydfil, and the wider Wales area. Every job gets the same free survey, fixed-price quote and written workmanship warranty, wherever it is.

How quickly can you survey a property in Cardiff?+

We reply to every enquiry within one business day to arrange a survey. Cardiff is covered by the same in-house team that works across the West Midlands, with surveys arranged around our regular South Wales work.

What work do you do in Cardiff?+

Energy upgrades such as solar panels, air source heat pumps, heating upgrades and external wall insulation, and building work including loft conversions, extensions, kitchens and full renovations.

Do you use local subcontractors in Cardiff?+

No. The same in-house team surveys, quotes and carries out the work in Cardiff, so there's no chain of subcontractors passing the job between them, and one team is responsible for the result.

What kind of homes do you work on in Cardiff?+

All kinds. Cardiff has whole streets of Victorian terraces, alongside inter-war semis and more modern estates, and the age and construction of a house changes what an upgrade involves, from the insulation it needs to how a heat pump is sized. That's why every quote follows a survey of the property itself.

Do I need planning permission for work in Cardiff?+

It depends on the work. Most energy upgrades and many extensions and loft conversions are permitted development, while structural, electrical and drainage work comes under Building Regulations. Wales has its own planning rules, which differ from England's in places, so we check what applies to your Cardiff address before quoting.

Can I spread the cost of work in Cardiff?+

Yes. We offer finance options through Ideal4Finance, subject to status, including interest-free options over shorter terms.

Free Local Quote

Get a Free Quote in Cardiff

Tell us about your solar, heating, insulation or renovation project in Cardiff and we'll come back within one business day with a straight answer, a plan and a real quote.

0333 533 4567 info@greentekenergy.co.uk 6060 Knights Court, Birmingham Business Park, Solihull, B37 7WY

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