Probably the least of her problems. Residential street in North London. Planning consent granted and neighbours happy about design.
She then discovered permitted development rights, particularly the 50% rule and changed the plan!
Planning now concerned about height following complaints from surrounding houses. Builder had assured her that height above soil level is the critical factor and lowered the soil by 800mm. Because the building is occupying nearly the full garden width, it is difficult to return soil for the measurement.
This is all before wafting wood smoke filters into bedroom windows.
regards
>