FAQs

1. What is External Wall Insulation (EWI)?

External Wall Insulation involves fixing a high-performance insulating layer to the outside of your property and finishing it with a durable, weather-resistant render system.
It improves your home’s energy efficiency, comfort, appearance, and long-term protection.

2. How will EWI benefit my home?

EWI provides a wide range of improvements:

  • Reduces heat loss and lowers energy bills (typically 25–40%)

  • Eliminates cold walls, damp patches, and condensation

  • Creates a warmer, more comfortable home all year round

  • Gives the property a modern, clean exterior finish

  • Improves kerb appeal and can increase property value

3. How long does installation take?

Most EWI and render projects are completed within 28 days, depending on:

  • Weather conditions

  • Property size and access

  • Chosen render system

We provide a clear schedule before work begins.

4. Do I need planning permission?

In most cases, no planning permission is required, as EWI is classed as an energy-efficiency upgrade.
However, planning consent may be needed if your home is:

  • Listed

  • In a conservation area

  • In a restricted planning zone

MAINCO will advise you during your free survey.

5. How much does it cost?

Costs vary based on property size, insulation thickness, and chosen finish.
As a guide, most EWI projects range from £90–£120 per m², inclusive of:

  • Materials

  • Labour

  • Scaffolding

  • Render system

  • Warranty

We provide a clear, itemised quotation after your free survey.

6. Is there a warranty?

Yes. All MAINCO installations include a 10-year insurance-backed warranty covering both materials and workmanship.

7. What finishes and colours are available?

We offer a large range of long-lasting finishes, including:

  • Silicone render

  • Acrylic render

  • Mineral render

Available in hundreds of colours and textures.
During your design consultation, we help you select the finish that suits your property.

8. Will the work be messy or disruptive?

We operate a No-Mess Promise:

  • Surfaces are protected before work starts

  • Our team cleans up daily

  • Waste and scaffolding are managed by us

  • Your home and garden are kept tidy throughout

9. How much energy will I save?

Every home is different, but typical savings are:

  • 25%–40% reduction in heating bills

  • Warmer rooms that retain heat longer

  • Dramatically reduced condensation and cold spots

We can show estimated savings with a thermal imaging report during your free survey.

10. Do you offer financing or staged payments?

Yes. MAINCO provides:

  • Low or no-upfront-cost options

  • Staged or milestone-based payment plans

  • Guidance on relevant grants or energy-efficiency schemes (where available)

11. How do I book a Free Energy Survey?

Email: brandon@maincoconstruction.com
We’ll arrange a convenient time to assess your property and provide:

  • A full energy and insulation survey

  • A detailed quotation

  • Thermal imaging (where appropriate)

All completely free of charge.

12. Are you a local company?

Yes. MAINCO Construction is a Bristol-based specialist in:

  • External Wall Insulation

  • Rendering & façade renovation

  • Energy-efficiency upgrades

We serve homeowners across Bristol and the South West.

Cold Walls & Condensation – Additional FAQs

13. Will insulation stop condensation?

In most cases, yes.
Insulation warms the internal wall surface, preventing moisture from turning into condensation. In some homes, we also recommend improved ventilation for the best results.

14. How long does a condensation-related project take?

Most projects take 1–3 weeks, depending on:

  • Property size

  • Weather

  • Access

15. Can you fix mould without insulation?

We can treat mould, but insulation is what prevents it returning.
The root cause is usually cold internal walls — insulation solves this permanently.

(Get a Free Online Estimate )