Where we work around Porthmadog

Porthmadog is about 21 miles from Bangor (Gwynedd) as the crow flies.

Other towns close by include Pwllheli.

Postcode districts	LL49, LL48, LL47
Council area	Gwynedd
County or area	Gwynedd

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.

Eaves ventilation kept clear
Gaps in the existing layer filled
Depth check and photos before and after

Why book with us in Porthmadog

Plain-English advice

We explain what we find in plain English, and say so when nothing needs doing.

Downlights made safe

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

Eaves kept clear

Insulation is held back from the eaves so the loft can still ventilate.

Boarding done properly

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

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

£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).

Work out a guide price for your loft

Building regulations in Wales

Wales has its own Approved Document L. Insulation alone is not normally notified, but conversions need building control. How the rules work across the UK.

Questions about a loft insulation top-up in Porthmadog

Is loft work in Porthmadog different from anywhere else?

The method is the same, but older terraces, cottages and newer estates each have their own quirks: lath ceilings, low pitches or trussed roofs. We plan for the loft we find.

Will I get a written quote for work in Porthmadog?

Yes. Every quote is in writing with the work, the price and what is included, so you can compare it properly.

How do I pay for work in Porthmadog?

Payment terms are set out on your quote. We never ask for payment on the doorstep or in cash.

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.

Can new insulation go on top of old insulation?

Yes, if the old layer is dry, clean and reasonably even. If it is damp, contaminated or badly compressed we recommend removing it first.

Loft insulation top-up in Porthmadog