Frequently asked questions

Yes. We can install the ceiling and underfloor insulation your rental needs, and arrange a Healthy Homes assessment for you. Give us a call to talk it through.

You can contact us directly on 027 482 0333, email admin@coastlineinsulationnz.com or send the quote form. We aim to call you back within 48 hours.

Absolutely. In New Zealand’s climate, quality insulation keeps your home warm and cosy through winter. It also helps prevent mould and moisture. Plus, insulation can increase your property’s value. Investing in quality insulation like Knauf and Mammoth is a smart choice for comfort, savings and peace of mind.

If rooms are difficult to keep warm, floors feel cold, or your power bills seem high, it is worth checking your insulation. Older insulation may have settled, been damaged, or left gaps.

Yes. Insulation slows heat moving through your home, helping it stay warmer in winter and cooler on hot days.

Insulation can help keep indoor surfaces warmer, but it will not repair leaks or replace good ventilation. Any moisture problems should be identified so they can be addressed properly.

Yes. Coastline Insulation is fully licensed and insured, so you can be confident you are working with a reputable, trustworthy company.

We retrofit ceiling insulation with Knauf batts and underfloor insulation with Mammoth, install underfloor moisture barriers, and remove old insulation fluff (Insulfluff). For new builds, we install ceiling, wall and underfloor insulation at framing stage. We work on homes, businesses and schools.

Most ceiling installs take 1 to 3 hours. Underfloor insulation is typically a one-day job for a 100m² home. We agree a start date and timeline with you before any work begins.

The best starting point depends on the gaps in your home. Ceiling insulation is often a priority for warmth, while underfloor insulation can make a noticeable difference in older homes with raised timber floors.

Insulation that is dry, secure and in good condition may be suitable to keep or top up. Wet, damaged or poorly installed insulation may need to be removed. An inspection will show which option makes sense.

Usually not. We will let you know before work starts if access or safety requirements affect any part of your home.

Yes. We insulate homes, businesses and schools, from new builds at framing stage to older buildings that need an upgrade.

We install wall insulation in new builds, at framing stage before the linings go on. For existing homes, we retrofit ceiling and underfloor insulation.

As a guide, ceiling insulation with Knauf batts is $1,600 to $2,000 for a 100m² home, and underfloor insulation with Mammoth is $2,200 to $2,500 for a 100m² home. Your quote depends on access and materials, so we price every job individually.

Yes. Every consultation and quote is free and no-obligation. You get a clear, detailed quote with no hidden fees, so you know exactly what is being installed and what it costs.

Not always. Most assessments are done through our online system. For more complicated homes, or if you would rather, one of the team will come out to you.

We work mainly along the coast: the Bay of Plenty (Katikati, Tauranga, Mount Maunganui, Whakatāne and Ōhope), the Coromandel and Hauraki (Whangamatā, Whitianga, Coromandel Town, Tairua, Thames, Paeroa and the Hauraki Plains), and Gisborne and the East Coast (Gisborne, Māhia, Tolaga Bay and surrounding areas). We also cover Rotorua and surrounding towns, and travel as far south as Taupō.

We are mainly coastal, but we travel inland to Rotorua and as far south as Taupō. If you are not sure whether we cover your address, give us a call and we will let you know.

As a guide, ceiling insulation is $1,600 to $2,000 for a 100m² home. Your quote depends on access and materials, so we quote each job and there are no hidden fees.

We fit Knauf batts. We use them across homes, businesses and schools.

Old loose-fill insulation can be removed before the new insulation goes in. We check what is in your ceiling space at the assessment and tell you whether it can stay or should come out.

Yes. We work on homes, businesses and schools, including laying insulation over a ceiling grid in a school classroom with the ceiling tiles going back in below it.

As a guide, underfloor insulation is $2,200 to $2,500 for a 100m² home. Your quote depends on access and materials, such as how easy it is to get under the floor.

It is for homes with a raised timber floor and space underneath. If your home sits on a concrete slab, there is no underfloor space to insulate, so ceiling insulation is the place to look.

Often it makes sense to do both together. We look at the subfloor at the assessment and tell you whether a barrier is worth fitting with your insulation.

Yes. We started in Gisborne and still do plenty of work there, and we also install across the Bay of Plenty, the Coromandel and Hauraki, and Rotorua.

At framing stage, once the framing is up and before the linings go on. That is when the walls are open and the insulation can be fitted properly.

Yes. We work with homeowners, builders and developers, as well as schools and businesses putting up new buildings.

Your plans and the details of the build. Tell us about the project through the quote form or give us a call, and we quote each job.

No. We also retrofit ceiling and underfloor insulation in existing homes, and we can remove old Insulfluff and fit ground moisture barriers.

As a guide, ceiling insulation is $1,600 to $2,000 and underfloor insulation is $2,200 to $2,500, each for a 100m² home. Your quote depends on access and materials, and covers any removal or moisture barrier work.

Yes. We can quote the ceiling, the underfloor, or both together, and agree a start date and timeline that suit you.

Only if it needs to go. If it is wet, damaged or poorly installed, it may need removing. Old Insulfluff is taken out before the new insulation goes in.

We can help with the insulation your rental needs and arrange a Healthy Homes assessment for you. Call us to talk it through.

Yes. Gisborne is where we started and we still do plenty of work there, as well as in the Bay of Plenty, the Coromandel and Hauraki, and Rotorua.

It is a polythene sheet laid over the soil under a raised floor. It helps reduce damp rising from the ground into the space below your home.

Often it makes sense to do both together. We look at the subfloor at the assessment and tell you whether a barrier is worth adding.

It helps reduce moisture rising from the soil, but it will not fix leaks, drainage or ventilation problems. If there is a bigger moisture issue, it should be identified so it can be addressed properly.

We quote each job, because it depends on the size of the subfloor and how easy it is to access. You get a clear, detailed quote with no hidden fees.

It is old loose-fill insulation, also called insulation fluff, that was put into ceiling spaces in older homes.

It depends on its condition. Insulation that is dry, secure and in good shape may be kept or topped up. If it has settled, got wet or been damaged, it may need to come out first. An inspection shows which.

Older loose fill can be dusty and can break down or settle over time. Removing it lets the new insulation go into a cleared space.

We quote each job, because it depends on the size of the ceiling space and how easy it is to access. You get a clear, detailed quote with no hidden fees.

Older loose fill can be dusty, so it is a job we are happy to take on rather than have you do it. We can remove it and fit the new insulation in the same job.