to (1) construct a new extension to the west elevation of the existing dwellinghouse (2) proposed external and internal alterations to existing dwellinghouse (3) proposed domestic garage and new access road to the rear of the existing dwellinghouse (4) replace existing septic tank and percolation area with new treatment system with polishing filter (5) proposed alterations to existing site entrance as well as all ancillary site works (Gross floor space proposed 254sm;retained 69sqm)