Building an extension usually comes down to one thing, you need more space, and you want it done properly.

Whether it’s a bigger kitchen, an extra bedroom, or somewhere to escape the chaos, the last thing you want is a space that’s freezing in winter, boiling in summer, or echoing like a warehouse.

That’s where your insulation choice matters. Get it right and the job feels solid. Get it wrong and you’ll feel it every day. Superglass insulation is one of those products that just does the job, no drama, no messing about.

Why insulation matters in an extension

An extension is basically a fresh build onto your home, so you’ve got one shot to get the basics right.

Choosing the right insulation means:

• Keeping heat in during winter and out in summer, helping reduce energy bills
• Reducing noise between rooms and from outside
• Can form part of a build-up designed to meet UK Building Regulations when correctly specified

Why builders and installers rate Superglass

When you’re on site, you don’t want products that slow you down. Superglass ticks the boxes installers actually care about:

• Lightweight and flexible so it’s easy to handle
• Quick to fit between studs and joists
• Cuts down on waste and awkward trimming
• Suitable for a wide range of applications, subject to specification requirements

One solution from top to bottom

The beauty of Superglass is you can use it across the whole extension, from roof to floor.

• Pitched roofs and loft spaces
• Internal stud walls
• Internal floors
• Suspended timber ground floors
• External timber frame walls

Sustainability that actually makes sense

More customers are asking about more sustainable builds, and this is where Superglass stands out.

It’s Manufactured from up to 84% recycled glass and contains no Ozone-depleting substances or greenhouse gases as well as helping to improve energy efficiency long term.

 

Spotlight on Adapt Slab 35

If you want a proper all-rounder for extensions, Adapt Slab 35 is worth a look.

Why it works

• Thermal Conductivity of 0.035W/mK
• Nominal density of 22kg/m³
• Fits standard stud and joist spacings to reduce gaps and cutting
• Flexible slab makes it easier to install cleanly
• Suitable for walls, floors and pitched roofs

Why choose MKM for your extension

You could run around different suppliers trying to piece everything together, or you could just come to MKM and get it sorted in one go.

At MKM you’ll get everything you need for an extension under one roof with knowledgeable teams who understand Superglass products as well as the whole building envelope. Explore kitchens with a free design service and home measure, bathrooms that make you feel like you’re in your own spa, and everything from doors, floors, plasterboard, insulation, landscaping, plumbing and heating supplies, right down to the tools you need to get the job done.

Don’t get stuck, we can advise on the right products, including insulation, for each part of the build and support from plan to completion. Bring your drawings in, grab a free brew, and let us help you pull it together.

Quick FAQs

What insulation do I need for an extension?

You’ll usually need insulation for walls, floors and the roof. Using a versatile product like Superglass makes it easier to cover all areas.

Is fibreglass insulation good for extensions?

Yes, it’s widely used because it’s cost-effective, easy to install and delivers solid performance.

Will insulation reduce energy bills?

It’s another factor that assists with reducing heat loss and lowering running costs. Read more about how Superglass can help with energy bills here. 

Does insulation help with noise?

It helps reduce sound between rooms and from outside. Some plasterboards can also help to reduce the noise transmission between rooms and externally.

An extension’s a big investment, so it pays to get the hidden stuff right. Superglass gives you a solid, reliable insulation solution that works across the whole build, is easy to install, and delivers long-term comfort. And with MKM, you’ve got the products, the know-how and the support to get it done properly.

No stress, no chasing, just a job well built. Contact your local branch today.