Loft condensation investigation in Porthmadog
We carry out a loft condensation investigation in Porthmadog and across Gwynedd, starting with a visit that is priced before you book.
We cover the LL49, LL48 and LL47 postcode districts. The local authority is Gwynedd.

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 condensation investigation?
We inspect the loft in daylight and by torch, measure moisture in the timbers, check the underlay, ventilation, insulation and the routes that let warm air in from the house, and look at the roof from outside. You get written findings with photos and a plain list of what we recommend, which may include work we do not offer. More about a loft condensation investigation.
- Loft inspection with moisture readings
- Written findings with photos
- Check of insulation, ventilation and air leaks
Why book with us in Porthmadog
Written findings
You get photos and a plain list of what we found and what we would do about it.
No pressure selling
You get everything in writing and decide in your own time.
Plain-English advice
We explain what we find in plain English, and say so when nothing needs doing.
Clear contact details
Your quote says who to call with questions before, during and after the work.
How much does a loft condensation investigation cost in Porthmadog?
This work is not an energy-saving material for VAT, so it is standard-rated if VAT applies. Where it is done alongside insulation, the quote shows each part separately.
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 condensation investigation in Porthmadog
Can a landlord in Porthmadog book work for a tenanted house?
Yes. We can arrange access with the tenant directly and send you photos once the work is finished.
Do you take on jobs outside Porthmadog?
Yes. We also work in Pwllheli and Caernarfon and elsewhere in Gwynedd.
Do you charge extra to travel to Porthmadog?
Not normally. Our guide prices include normal travel to Porthmadog. If an address needs a ferry or an unusually long journey, we tell you the cost before you book.
Is condensation in my loft normal?
A little on the coldest nights can be normal, especially with old felt. Dripping, wet insulation or mould are signs to investigate.
Is the investigation fee taken off the work?
The investigation is priced on its own so the advice is not tied to selling work. You decide what to do afterwards.
