It shouldn’t do. Most companies will do all the interior work first, and the last job to do will be creating the opening from the house to the conversion. A reputable company will make sure they cause as little disruption as possible during this time.
Talybont
Tal-y-Bont is a tiny town in Conwy County Borough, Wales and hinges on the Conwy Valley, west of the River Conwy, on the B5106 road, six miles from the community of Conwy to the north, and also six miles from Llanrwst to the south, and also in the area of Caerhun. It lies adjacent to the village of Dolgarrog to the south, and listed below the small settlement of Llanbedr-y-Cennin to the west. The 'Bont' (the altered type of pont, Welsh for "bridge") in the name probably describes the bridge over the Afon Dulyn, a tributary of the nearby River Conwy, which runs through the town. Tal-y-Bont is the starting factor for the roadway to Llyn Eigiau as well as the southern Carneddau mountains. Access to the northern end of the Carneddau Range as well as the Roman road over to Aberystwyth can also be accomplished by following the road up from Tal-y-Bont via Llanbedr-y-Cennin - which is on the eastern side of the Snowdonia National Park - and also taking a left fork at the bar, Ye Olde Bull Inn, in Llanbedr. Walkers can access optimals in the northern end of the Carneddau Range such as Drum as well as Foel Fras, and afterwards continue southern eastern to reach Carnedd Llewelyn.