Underfloor Insulation in Auckland

Kaiser Insulation installs and replaces underfloor insulation in Auckland homes with suspended timber floors. We check the existing insulation and access, explain your options and provide a clear quote. Our owner-operated team regularly works in older villas, bungalows and tight crawlspaces.
200+ 5-star reviews

Google & Builderscrack

Get a free underfloor quote →

Owner-operated • NZS4246:2016 compliant • Quality workmanship

Underneath wooden structure with soil ground, wooden posts, and insulated roof beams.

Underfloor insulation for existing Auckland homes

Insulating a suspended timber floor reduces heat loss through the floor and can make rooms more comfortable. It is worth checking if your home has no underfloor insulation, exposed gaps, sagging material or old foil.A good installation depends on the fit as well as the product.

We assess the existing material, joist layout and access before recommending what to keep, repair or replace. If the current insulation is still doing its job, we will explain where an upgrade is likely to offer value.Insulation and draught sealing address different sources of heat loss. Gaps around floorboards or pipes may need separate attention. For wider improvements, ask about a full insulation upgrade

Attic space with pink fiberglass insulation covering the floor and wooden roof trusses, featuring a flexible silver ventilation duct.
Crawl space with wooden beams, plumbing pipes, blue tubing, and black plastic ground cover.

How much does underfloor insulation cost in Auckland

Underfloor insulation is priced around the area to be insulated, the chosen product and the work needed underneath the house. Two homes with the same floor area can cost different amounts if one has easy access and the other needs old insulation removed or work in a restricted crawlspace.

The main cost factors are:

  • The accessible floor area, joist spacing and selected R-value.
  • Subfloor access and obstacles that affect installation time.
  • Removal and disposal of existing insulation, where required.
  • Any ground moisture barrier included in the proposed work.

Use our insulation cost calculator for an initial estimate, then request a free assessment and quote for your property.

Talk to our team →

Polyester underfloor blanket (our preferred system)

We strongly prefer polyester blanket, because it's the best all-round product for retrofit underfloor work. It's durable, moisture resistant, and holds its shape long term. Underfloor insulation lives in a harsh environment - dampness, dust and the occasional rodent resident. Polyester blanket handles these better than all alternatives.

insulation icon

Installed properly, it's a clean, consistent result that performs for decades. We stock a full range of R-values and widths.

healthy homes certificate icon

Underfloor insulation comes in different materials. On request we can touch up or install glasswool underfloor insulation. Whilst we're happy to replace polystyrene option we can't install it as full solution.

Crawl space with wooden beams, insulation on ceiling, and large black plastic sheet covering the ground.

Should existing underfloor insulation be replaced

Finding insulation under the house does not automatically mean it needs replacing. Its condition, coverage and installation determine what work is worthwhile. These are three common situations we assess.

Reccomend replacement

Foil insulation

Common in 70's–00's homes. It relies on reflection, so the shinier it is, the better it performs.

The problem is it quickly degrades over time - dusty, dull, torn - and loses most of its effect. Less shine means less performance.

⚠️ Foil must be removed before installing new insulation.

⚠️ It is illegal to repair foil insulation

Usually R1.5

Existing polyester blanket

One of the better things to find.

‍R1.5 polyester blanket is very common, often well installed and holding up well.

‍R2.0 is the current modern standard, and we can go higher -which we often recommend for villas and older homes.

Real talk: upgrading decent existing polyester only makes sense if the rest of the home's energy efficiency has been prioritised first.

Commonly R1.4

Polystyrene (EXPOL)

Commonly in the form white or black polystyrene sheets. It has its place, but it's frequently associated with bits falling down and poor installation.

Older homes often have irregular joist spacings and awkward sections needing "puzzle work". When done poorly, you get gaps and lost performance. Value matters - sometimes it's worth replacing, sometimes it isn't.

Despite the manufacturer's claims EXPOL is rarely accepted for recyclng as it's too "dirty". This means the only method of disposal is via landfill at signficant cost.

Wooden beams supporting a ceiling with white insulation in a dark basement or crawl space.Insulated attic ceiling with wooden beams, exposed wiring, and a black plastic-covered roof section.Underneath a house showing wooden beams, concrete pillars, dirt ground, and insulation on the ceiling.View inside a crawl space showing exposed wooden beams, green insulation, pipes, and electrical wiring.Crawl space with wooden beams, foam insulation on ceiling, plastic vapor barrier on floor, and piping.Interior of a wooden structure with insulation on the ceiling and wooden beams supporting the floor.Wooden structure with insulation foam between beams, diagonal support beam, and an outdoor air conditioning unit.Wooden structure with vertical posts supporting a ceiling lined with insulation foam above dirt and plants.Crawl space with wooden support beams, foam insulation on ceiling, and black ground vapor barrier.

Underfloor Insulation FAQ's

What to expect on install day?

Underfloor insulation isn't disruptive work, but below are things worth considering:
‍
Noise: we use stapling/fixing equipment underneath the home, so it can be a bit noisy. If you’ve got Zoom calls booked or a baby nap schedule, it’s worth planning around it.

Mess: we keep things clean. There’s no dust blowing through the house. We take all our rubbish and take care around any stored items.

Smell: it’s not uncommon to notice a temporary “musty” smell after the install, especially in older homes with original timber floors. That’s just the ground being disturbed, it usually clears within a day.

You don’t need to be home for the job, we just need clear access to the subfloor hatch.

Does underfloor insulation help with dampness in Auckland homes?

Dampness is usually a moisture issue. If the subfloor is damp or musty, we strongly recommend pairing insulation with a ground moisture barrier → for the best result.

What if I already have foil underfloor insulation?

Foil insulation is no longer seen as an efficient or acceptable option. It works through reflection and requires the foil to be shiny for maximum benefit. Over time it dulls, rips and degrades. It needs to be removed before installing any new insulation.

My subfloor access is TIGHT...

Our definition of tight is often different to yours! Tight access is normal in Auckland homes, especially in central suburbs. If it's possible, we’ll do it. We’ve got a reputation of being able to do jobs that others can’t or won’t.

How long does it take to install underfloor insulation?

Most jobs take several hours or so. Larger homes, tight access, or removals can take longer but we’ll set expectations upfront.

Wind-wash?

Negative impact of wind (up to 25%) on insulations performance. Experienced by non-rigid materials like glasswool/fibreglass and polyester. Typically a concern when underfloor cavity is exposed and in a high wind zone.

We're rated a flawless 5-stars across 200+ reviews on Google, Builderscrack and NoCowBoys

Check out some of our detailed reviews on Google , NoCowboys or Builderscrack

Google rating for Kaiser Insulation showing 5.0 stars with 91 reviews.

I was very happy with the work that Alex and his boys did at my place, they installed ceiling insulation, underfloor insulation and also a moisture barrier. Overall the service was professional and efficient. I really appreciated his pragmatic approach and suggestions to get the job done properly and at a fair price. I wouldn't hesitate to use his services again and I recommend him to any of my friends and colleagues who are looking for this kind of work to be done.

Jeremy

So happy with my insulation job completed by Alex and his team of professionals. Alex responded to my enquiry promptly and my job requirements with some different options which gave me choices and all at very good pricing . His team were punctual, incredibly polite and friendly and extremely efficient. They over delivered and left the property in a very tidy and clean condition, taking all their rubbish away with them. I would recommend Kaiser Insulation to absolutely anyone for price, efficiency and service with a smile. The PS3 and Branz information were provided promptly at the end of the job in time for the inspector. Well done guys! and Thank You So Much Alex. You are running a great business!

Kathryn

Alex and his team completed a tricky roof space and under floor insulation install along with the laying, staking and taping of an under house ground moisture barrier. The work carried out is of the highest calibre. The team being polite and considerate throughout the process. Based on our experience, would highly recommend Kaiser Insulation. Thanks Alex and crew. An outstanding result.

John

We had an amazing experience with Kaiser insulation team on our 1910 villa! Alex, Simon and Alesana were incredibly friendly, professional, and clearly took real pride in their work. Everything was done with great care and attention to detail, the install was super tidy and neat, and they left everything spotless. Along with a great service, the pricing was competitive. We’ve already been recommending them to friends and will absolutely use them again in the future. Couldn’t be happier! If you are looking for an insulation company, look no further, these are your guys!

Alice

Alex and the team were simply the best tradies we've had during our 9month renovation. Nothing is too much, he does what he says when he says, prompt and on time and they always have a smile no matter how awkward our "underfloor area was". Quite simply thank you Kaiser Insulation for making our live easier ... and warmer :)

Andrew

Really happy with the work that Alex and his team did with installing underfloor and ground moisture barrier at my house. Very professional and efficient from giving a quote to completing the job. The price quoted was very competitive and he also charged me less after the job completion as the job was less than the quoted measurement which shows his honesty. Highly recommend Alex and Kaiser Insulation for any insulation job.

Amin

Get in touch

Fill in the form below and we will be in touch as soon as we can. Genuine insulation enquiries only, please. Salespeople, save us both the trouble.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Is Underfloor Insulation Worth It for Your Home?

Underfloor insulation makes the biggest difference in Auckland homes with suspended timber floors, especially older properties.

It’s a strong upgrade if:

  • Your floors feel cold year-round
  • Your home is draughty or hard to heat
  • You have little or no existing insulation
  • You’re living in an older villa or bungalow
  • Your heating doesn’t seem to be doing much

Because cold air sits underneath your home, it rises through gaps in the floor and affects the entire space. Proper underfloor insulation stops that at the source.

Full Insulation Upgrades →Insulation Removal →Insulation Insights for NZ →021 178 5994
Privacy PolicyWebsite Credit