Level of intervention into the structure | Cost? | Labour? |
Minor: Interior jobs
|
Low to mid level | Can be DIY or contractor - low to middle amount of labour. |
Mid-Level: Interior and some exterior
|
Mid-level to high |
Contractor, energy advisor Best approach - well planned and noticeable results |
Major: Interior and Exterior
|
High level - phased project, costing spread over years |
General contractor, Energy advisor, Architect, Engineer Most effective results for retrofit aimed at Net Zero, Passive House |