Loft insulation top-up in Hertfordshire

Where we work around Hertfordshire

We work across the Hertfordshire council area.

That covers the AL, CM, EN, HP, SG and WD postcode areas.

Councils	Hertfordshire
Postcode areas	AL, CM, EN, HP, SG, WD
Towns listed	18

What is a loft insulation top-up?

Before we quote we measure the existing layer in several places and check its condition. If it is wet, dirty, matted or full of droppings, laying fresh wool on top just buries the problem, so we say so and price removal instead. More about a loft insulation top-up.

Tank jacket and pipe lagging in the loft
Eaves ventilation kept clear
Gaps in the existing layer filled

Why book with us in Hertfordshire

Tank and pipes protected

Every insulation job includes a tank jacket and pipe lagging, so nothing freezes in a colder loft.

Downlights made safe

Fire-rated covers or a clear zone around recessed lights.

Boarding done properly

Storage boards go on loft legs, never straight onto the insulation.

Honest about grants

If you might qualify for funding, we tell you before we quote.

How much does a loft insulation top-up cost in Hertfordshire?

£395 to £545Terraced house, average loft, topping up from about 100 mm. Free survey and a fixed written quote before any work.

Installing insulation in a home is zero-rated for VAT until 31 March 2027 and 5% after that, under HMRC's rules for energy-saving materials (notice 708/6). The Energy Saving Trust puts a typical professionally installed loft at about £750 from bare joists, or £600 to top up from 120 mm.

Work out a guide price for your loft

Building regulations in England

In England, a loft insulated across more than half its area should reach a U-value of 0.16 W/m²K. Insulation alone is not usually notified to building control. How the rules work across the UK.

Funding in England

ECO4, the energy supplier scheme, runs until 31 December 2026 for eligible households, with no supplier scheme to follow it.
The Great British Insulation Scheme closed on 31 March 2026.
The Warm Homes Plan, announced in January 2026, funds upgrades for low-income households, including through councils under Warm Homes: Local Grant.
Check what is open for your address on GOV.UK before agreeing to any funded offer.

GOV.UK: find ways to save energy in your home

Questions about a loft insulation top-up in Hertfordshire

Can you quote for several properties in Hertfordshire?

Yes. Landlords and agents can send a list of addresses and we will survey them in as few visits as we can.

Which council covers my address in Hertfordshire?

Addresses in Hertfordshire come under Hertfordshire council. The council matters for building control questions and some funding schemes.

Which way should the top-up layer run?

Across the joists, at right angles to the first layer. That covers the tops of the joists, which otherwise let heat escape along the timber.

Is it worth topping up 100 mm of loft insulation?

Often, if the existing layer is in good condition and you also want a warmer house or a better EPC. On bill savings alone, a top-up from about 100 mm takes decades to pay back, so the case is strongest when it is done alongside other loft work.