Frequently asked questions

If you notice draughts, timber rot, condensation between the panes or windows that don’t close properly, replacement is often a sensible option. New window frames with insulating glazing immediately improve comfort and reduce heat loss.

HR++ double glazing consists of two panes of glass with an insulating coating and a gas-filled gap. Triple glazing has three panes and provides even better insulation. The right choice depends on your window frames and your requirements.

If your existing window frames are still in good condition and can accommodate thicker glass, you can have just the glazing replaced. We’ll check whether this is possible during the inspection.

The gap between the inner and outer walls is filled with insulation through small drilled holes. The holes are then neatly filled to match the colour of the mortar joints.

Most homes with cavity walls are suitable. During an inspection, we check the width and condition of the cavity and look for any damp problems.

If there is a crawl space beneath your floor, the underside of the floor is insulated with polyurethane (PUR) foam or insulation boards. This reduces heat loss through the floor and makes it feel warmer underfoot.

Crawl space ground insulation involves covering the ground beneath your floor with insulating material. This reduces damp and cold rising from the ground and is an option when the floor itself is difficult to access.

We insulate a pitched roof from the inside, exclusively with PIF thermal cushions. A flat roof can be insulated on the top or underside.

Many insulation measures are eligible for the national ISDE subsidy. Some municipalities also have their own schemes. Conditions may change.

The amount depends on the measure, the area in square metres and the number of measures you combine. You’ll find the current amounts for each measure on our grant pages.

Many local councils offer their own scheme in addition to the ISDE grant. Our local council pages show the conditions for each council and whether funding is still available.

Yes. We check which schemes apply to your home and help you with your application, so you don’t miss out.

Yes, there are ways to spread the cost of insulation, for example through the Warmtefonds. We’ll be happy to explain the options available to you.

Many insulation jobs can be completed in a single day. The exact time required depends on your home and the measure you choose.

An inspection helps assess the technical options, ventilation and condition of your home thoroughly in advance.

For most jobs, it’s helpful to have someone at home to let the installers in. We’ll agree this with you in advance.

Yes, our work comes with a 10-year guarantee.

The cost depends on the measure, the area to be insulated and your home’s specific circumstances. Request a free quote for a price tailored to your home.

If you request a quote or a callback during office hours (Monday to Friday, 07:00 to 16:15), we’ll contact you within a few hours. Outside these hours, we’ll usually get back to you within 24 hours.