Greentek Energy Ltd engineer working on a rendered house wall in Swansea
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Building Construction and Renewable Energy Installers in Swansea

We do three things in Swansea and we do them with our own staff: building construction, solar and heat pumps. Extensions and renovations across SA1 to SA9 and out onto Gower, MCS certified solar PV, and air source heat pumps sized from a heat loss calculation, with insulation alongside all three. Wales sets its own planning rules, its own building regulations and its own funding routes, and we work to those rather than to an English quote with the town name swapped.

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Building, Solar, Heat Pumps and Insulation in Swansea

Every service below is delivered by our own in-house team rather than subcontracted out. Building work runs through one project manager with the Swansea Council planning application and Building Control handled by us, solar and heat pump installations are MCS certified, and insulation is specified after a survey rather than off a price list.

Areas We Cover Around Swansea and Gower

We work across SA1 to SA9 and the whole Gower peninsula, from the Maritime Quarter and Uplands out through Sketty, Killay and Dunvant, up the Tawe valley through Morriston, Clydach and Pontardawe, west to Gorseinon, Loughor and Pontarddulais, and along the coast to Mumbles, Langland and Rhossili. Neath, Port Talbot and Llanelli are inside the same run.

UplandsBrynmillMount PleasantSt ThomasPort TennantSkettyKillayDunvantMumblesNewtonLanglandCaswellBishopstonPennardParkmillReynoldstonRhossiliMorristonClydachYnystaweLlansamletBirchgroveFforestfachPenlanGorseinonLoughorPenllergaerPontarddulaisPontardaweNeathBriton FerryPort TalbotLlanelli

Building on Gower, and What the AONB Changes

Gower was the first Area of Outstanding Natural Beauty designated anywhere in the United Kingdom, back in 1956, and the designation covers most of SA3. That is not a detail for the brochure. Inside an AONB, permitted development rights are tighter than elsewhere, the size and position of an extension is constrained, and the materials and finishes on an external wall are subject to a view that would never be taken in a Swansea suburb. A good number of Gower properties are listed on top of that.

So the first thing we do with a Gower address is establish what it actually sits inside, before anything is drawn. The planning application to Swansea Council, the Building Control sign-off, the party wall notices and the structural calculations are all handled by us, whether the job is a single storey extension, a loft conversion or a full home renovation. Finding out at the design stage that the roof line has to change is normal. Finding out after the drawings are paid for is not.

What Swansea Weather Does to a Building

Swansea is one of the wettest cities in Britain and this stretch of coast sits in the severest driving rain exposure category the British standards define. That is a specification instruction, not a weather comment. A render system that performs perfectly well on a Midlands semi can fail here, because the water arriving at the wall is being driven into it rather than running down it. Near Mumbles and out along Gower there is salt in the air as well, and salt finds any fixing that was not chosen for it.

In practice that means the external wall insulation we specify here uses a render build-up rated for this exposure, with the detailing at sills, reveals and verges done to match, and the mounting hardware and flashings on a solar PV installation are chosen to survive the air they will sit in for twenty five years. None of it costs much more at the point of specification. All of it costs a great deal to put right afterwards.

Swansea Housing, From Uplands Terrace to Valley Cottage

The housing changes completely over a few miles. Uplands, Brynmill and Mount Pleasant are Victorian and Edwardian terraces, solid walled, a lot of them let to students from the university. Sketty, Killay and Dunvant run to interwar and post-war semis with cavities that were often never filled. Penlan, Blaenymaes and Portmead are post-war estate housing. Up the Tawe valley, Morriston, Clydach and Pontardawe are industrial-era terraces built for the copper and tinplate works. And Gower has stone cottages that predate all of it.

Each of those wants a different first job. The semis get the most from cavity fill and a proper loft insulation job. The solid walled terraces cannot be injected at all. The older stone properties on Gower often need breathable materials rather than modern sealed systems, which rules several standard products straight out. And where the fabric is already sound, the useful work is a heating system upgrade or an air source heat pump rather than anything to the walls. The survey decides, not a price list.

Wales Has Its Own Rules, and Its Own Way of Working

Planning and building regulations are devolved, so the permitted development limits, the energy standards an extension has to meet and the home energy funding routes available to you are all set in Wales rather than Westminster. A quote written against English rules does not simply transfer across the bridge, and we do not write them that way. It is one of the more common reasons a Swansea homeowner ends up with an estimate that falls apart at application stage.

We are honest about the second thing too: our office is in the Midlands, so Swansea is a drive rather than a short hop. We plan the work around that instead of pretending otherwise. Jobs here run in longer continuous stretches on site rather than short visits spread over weeks, materials are scheduled to land before the team does, and you get the same project manager and the same written warranty as anywhere else we work. Landlords, managing agents and commercial sites on planned maintenance contracts are covered on the same basis, as is interior work such as a kitchen renovation or a reworked living room.

  • Welsh planning and building regulations applied, not English ones
  • AONB and listed status checked before anything is designed
  • Render and fixings specified for this coast, not a national average
  • Builders, electricians, heating engineers and insulation fitters all in-house
  • MCS certified for solar PV and air source heat pumps
  • Free survey at the property, and a written workmanship warranty on completion

Swansea is one of six areas we work in, and the same team, the same certification and the same warranty apply wherever the job is. You can see the full list on our areas we cover page, or read how we work as builders and renewable energy installers across the UK. If you would rather spread the cost of a larger job, the terms are set out on our finance page.

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Projects Completed

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

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Years Combined Experience

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

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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.

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

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.

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.

Omer M.

Home Owner

Quick and efficient service.

Review from Google

★★★★★

Amjid H.

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

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.

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.

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 Swansea do you cover?+
We cover SA1 to SA9, which takes in the city centre, Uplands, Brynmill, Sketty, Killay, Dunvant, Morriston, Llansamlet, Clydach, Gorseinon, Loughor, Pontarddulais and Pontardawe, along with the whole Gower peninsula from Mumbles to Rhossili. Neath, Port Talbot and Llanelli are covered too.
My house is on Gower. Does the AONB change what I can do?+
Yes, and more than most people expect. Gower was the first Area of Outstanding Natural Beauty designated in the UK, and inside it permitted development rights are tighter, extensions are limited, and materials and finishes are controlled. Many Gower properties are also listed. We check the designation before designing anything.
Are the planning and building rules different in Wales?+
They are. Planning and building regulations are devolved, so permitted development limits and the energy standards a new build or extension must meet are set in Wales, not Westminster. The home energy funding routes differ too. A quote written against English rules does not transfer, and we do not write them that way.
Do you take on extensions and structural work, or only energy jobs?+
Both, and building work is the larger half. Extensions, loft conversions, knock-throughs, kitchens and full refurbishments all run through our own team, with the planning application to Swansea Council, Building Control, party wall notices and structural calculations handled by us.
Does the coastal weather change how a job is specified?+
It does. This stretch of coast sits in the severest driving rain exposure category in the British standards, and the salt in the air near Mumbles and Gower attacks fixings. Render systems, mounting hardware and flashings are specified for that here, not to a general national default.
You are based in the Midlands. How does that work for a Swansea job?+
We plan it differently rather than pretending the drive does not exist. Swansea work runs in longer continuous stretches on site instead of short visits spread over weeks, with materials scheduled to arrive before the team does. You get the same project manager and the same written warranty either way.
Can I spread the cost of work in Swansea?+
Yes. Finance is available on most of our installation and building work in Swansea, so a larger project can be spread over a term rather than paid in one go. The options, the terms and how to apply are set out on our finance page.

Free Local Quote

Built for Welsh Rules and a Welsh Coast

Tell us what the property needs and we will come and look at it properly, with the designation, the exposure and the Welsh regulations checked before a figure is written down.

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Fully Accredited & Certified.

  • MCS Certified
  • TrustMark Government Endorsed Quality
  • Gas Safe Register
  • HIES accredited
  • Amtivo certified
  • SWIGA member
  • Qualitymark Protection accredited
  • British Assessment Bureau certified