External Wall Insulation & Rendering in Swansea
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External Wall Insulation in Swansea

Along the Swansea coastline, the same fixed-price, in-house approach applies to external wall insulation: wrapping external walls in insulation and rendering to improve thermal performance and refresh the exterior, particularly suited to older, traditionally-built homes, with no local subcontractor markup.

Our in-house team covers Swansea and the surrounding Wales regularly for external wall insulation projects, with no subcontractors passing the job around.

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External Wall Insulation & Rendering

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Sound familiar?

Solid walls that let the heat straight out, and the damp in?

Older homes with solid walls have no cavity to fill, so they lose heat straight through the brickwork. In an uninsulated home, around a third of the heat escapes through the walls, and no amount of turning up the thermostat fixes a wall that can't hold it.

External wall insulation wraps the outside of the house in an insulated, rendered layer. Done badly, it traps moisture. Done properly, it's one of the biggest single improvements an older home can have, and your rooms stay exactly the same size.

Assess my walls
  • Cold, heat-hungry walls

    Solid brick that loses heat almost as fast as your heating can put it in.

  • Damp and mould

    Cold inside wall surfaces where condensation settles and black mould follows, often behind furniture and in corners.

  • Tired, weathered exterior

    Crumbling render, blown patches or worn brickwork that needs attention anyway.

  • No room to insulate inside

    Rooms too small to give up space to internal wall insulation.

What's Included

  • Fitted by our own external wall insulation installers, no subcontractors
  • External wall insulation and render as one complete system
  • Weatherproof render finish in a choice of colours and textures
  • Sills, eaves, pipework and openings detailed to keep moisture out

We also deliver external wall insulation work near Swansea in:

UplandsBrynmillMount PleasantSt ThomasPort TennantSkettyKillayDunvantMumblesNewtonLanglandCaswellBishopstonPennardParkmillReynoldstonRhossiliMorristonClydachYnystaweLlansamletBirchgroveFforestfachPenlanGorseinonLoughorPenllergaerPontarddulaisPontardaweNeathBriton FerryPort TalbotLlanelli

External wall insulation in Swansea

Many homes in and around Swansea are older solid-wall properties, and coastal exposure makes wind-driven rain and damp a real consideration. Solid walls lose far more heat than filled cavity walls, and cavity fill isn't an option for them. External wall insulation wraps the outside of the house and finishes it in render, which renews the look of the property and adds a weatherproof layer against wind-driven rain.

What the survey checks

We confirm the wall construction, check for damp, and plan the details around windows, sills, downpipes, meters and the roof line, which are where external insulation succeeds or fails. Swansea is covered by the same in-house team that works across the West Midlands, with surveys arranged around our regular South Wales work.

Planning and building rules in Swansea

External wall insulation changes the outside of the building, so it can need planning permission, particularly in a conservation area or on the front of the property. Welsh planning rules differ from England's in places, so we check what applies to your Swansea address, and the work is notified under Building Regulations.

Often done alongside external wall insulation in Swansea

Beyond Swansea, the same in-house team carries out external wall insulation in Neath, Port Talbot, Bridgend and Wrexham. For how we approach the work anywhere, see our External Wall Insulation & Rendering page.

External Wall Insulation — after
External Wall Insulation — before

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Case study

External Wall Insulation

See the before and after of a full external wall insulation upgrade on an older property, where the solid walls were insulated and finished with a new render by our own installers.

The external walls of this older property were insulated from the outside and finished with a new render, cutting the heat lost through the building fabric and making the rooms far easier to keep warm.

Because the insulation is fixed to the outside of the walls, no room lost any floor space and the household stayed in the property throughout. The render then works as a weatherproof layer over the top, protecting the brickwork from rain and frost.

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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.

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

What it costs

What External Wall Insulation Costs

External wall insulation is priced by the wall rather than by the house, so two homes of the same size can cost very different amounts. These four things set your price.

  • Wall area

    The total area to be insulated and rendered, measured properly at the survey.

  • Access and scaffolding

    Height, ground conditions and how much scaffolding the property needs.

  • Insulation thickness

    How thick the insulation needs to be for your walls to reach the performance we're aiming for.

  • Render and detailing

    The finish you choose, plus sills, eaves and openings, which is where this work is won or lost.

Every quote includes

  • A free site survey, with no obligation to go ahead
  • A fixed price agreed in writing before any work starts
  • Materials, labour and making good, in one price
  • Our own team throughout — no subcontractors marking the job up
  • A written workmanship warranty on completion

We don't quote over the phone from a postcode — the survey is what makes the price fixed rather than an estimate that moves. Finance is available through Ideal4Finance, subject to status.

Get a fixed-price quote

Frequently asked questions

How much does external wall insulation cost in Swansea?+
It depends on the wall area, scaffolding access and the render finish you choose. We survey your Swansea property and give a fixed-price quote. Swansea is covered by the same in-house team that works across the West Midlands, with surveys arranged around our regular South Wales work.
Does external wall insulation suit older homes in Swansea?+
Often, yes. Many homes in and around Swansea are older solid-wall properties, and coastal exposure makes wind-driven rain and damp a real consideration. Solid-wall homes have no cavity to fill, which is exactly where external wall insulation makes the biggest difference.
Do I need planning permission for external wall insulation in Swansea?+
It can depend on how much the appearance of your home changes, particularly on a front elevation. Wales has its own planning rules, which differ from England's in places, so we check what applies to your Swansea address before quoting.
Can external wall insulation help with damp in Swansea?+
It can. Along the Swansea coast, wind-driven rain and cold solid walls are common causes of damp inside. Insulating and rendering the outside keeps the walls warmer and drier, provided the system is chosen and detailed for an exposed site.
Do you install external wall insulation in Neath and Port Talbot?+
Yes. The same in-house team that handles external wall insulation in Swansea also covers Neath, Port Talbot, Bridgend and Wrexham, with the same survey, fixed-price quote and workmanship warranty. See everything we do in Swansea.

Free Local Quote

Get a Free External Wall Insulation Quote in Swansea

Tell us about your external wall insulation project in Swansea and we'll come back within one business day with a straight answer, a plan and a real quote.

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