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.
Liss
Liss (previously led to Lys or Lyss) is an English village as well as civil parish in the East Hampshire area of Hampshire, 3.3 miles (5.3 km) north-east of Petersfield, on the A3 road, on the West Sussex boundary. It covers 3,567 acres (14 km ²) of semi-rural countryside in the South Downs National Park. Liss train station is on the Portsmouth Direct Line. The village consists of an old town at West Liss and a modern village round the 19th-century station. They are separated by the River Rother. Residential areas later on spread out in the direction of Liss Forest.