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Why Skimping on Insulation Is One of the Biggest Renovation Mistakes Homeowners Make

24/01/2026

When planning a home renovation, it's natural to focus on the visible results — bathrooms, finishes, lighting, and layout.
But one of the most important elements of any renovation is completely hidden once the job is finished.

Insulation.

It's not exciting, but it has a huge impact on comfort, energy efficiency, and the long-term success of a renovation.

Insulation Is Best Done During Renovation — Not After

A renovation is often the only realistic opportunity to improve insulation properly.

Once walls and ceilings are closed:

  • Upgrading insulation becomes disruptive and expensive

  • Finished surfaces may need to be removed again

  • Results are often compromised

Doing it right at renovation stage saves money, time, and frustration later.

📸 Real Renovation Example: Insulation Installed Before Finishes

This stage of the build is critical. Proper insulation must be fitted neatly and continuously before any plastering or decorative finishes begin. Gaps, compression, or poor detailing at this stage can reduce performance significantly.


Comfort Starts Behind the Walls

A renovated home should feel warm, solid, and comfortable — not just look good.

Poor insulation often leads to:

  • Cold spots and uneven room temperatures

  • Drafts, especially in bathrooms and stairwells

  • Condensation on walls and ceilings

  • Higher heating bills year after year

Good insulation creates:

  • Consistent warmth throughout the home

  • Improved sound insulation between rooms

  • A more solid, high-quality feel once complete

No amount of high-end finishes can compensate for a home that's uncomfortable to live in.

Bathrooms & Wet Areas Need Extra Attention

Bathrooms are one of the most common places where insulation is overlooked.

Without proper insulation:

  • Cold wall surfaces attract condensation

  • Moisture can build up behind finished walls

  • Long-term issues may develop unseen

When renovating bathrooms, insulation should be considered as essential as waterproofing and ventilation.

Insulation Helps Protect Your Finishes

High-quality finishes — decorative plaster, polished plaster, microcement — perform best in a stable environment.

Good insulation helps:

  • Reduce temperature fluctuations

  • Control moisture movement

  • Protect finishes from long-term stress

In other words, insulation helps protect the investment you're making in the visible parts of your renovation.

Energy Efficiency & Long-Term Value

Beyond comfort, insulation:

  • Improves energy efficiency

  • Reduces heating costs

  • Enhances your home's overall value

  • Positively affects BER ratings

Buyers are increasingly aware of energy performance — even in older, renovated homes.

Our Approach to Renovations

During renovation projects, we encourage homeowners to think beyond what they'll see on completion day.

Taking the time to get insulation right:

  • Improves comfort

  • Protects finishes

  • Reduces long-term costs

  • Results in a better-quality renovation overall

It's one of the decisions homeowners are most grateful for once they've lived in the space.

Planning a Home or Bathroom Renovation?

If you're planning a renovation, early decisions make the biggest difference.

📩 Get in touch to discuss your renovation project and ensure the work behind the walls is done right — before the final finishes go on.

Marbled Plastering
Home Renovations & Interior Upgrades
Serving Limerick & surrounding counties
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eamon@marbledplastering.ie
+353 85 187 0113
County Limerick, Ireland
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