Mill House, 10 Portaferry Road, Bootown, Greyabbey, Newtownards, Co. Down, BT22 2RU

Mill House is a long, plain rectangular two-storey gabled house of probable 18th century origin, situated on the north east side of Portaferry Road, roughly half a mile south east of Greyabbey, County Down. The building was lengthened in later years and extended at the rear.

The front south west elevation is asymmetrical. The front facade is finished in lined render, now partly covered in creeping plants, while the rear is finished in roughcast. The roofs of the main house and the return are pitched with Bangor blue slates. There are four brick chimneys to the north west side of the roof of the main house and one to the gable of the return. The rainwater goods are a mixture of cast iron and PVC.

To the left of centre of the front elevation is a flat roofed porch with a timber panelled front door to its north west face and a fixed light window with Georgian panes to the south west. To the left of the porch on the ground floor are three sash windows with Georgian panes, two to the immediate right of the porch and a further similar window much further to the right. The first floor has ten similar but smaller windows. A distinct space appears between the sixth and seventh first floor windows, a gap repeated on the ground floor. From the seventh window onwards on the first floor, the level of the window openings is marginally higher than those further to the left. This arrangement suggests that the section to the left, containing the first six first floor windows, is the original dwelling house, while the section to the right was a store. This is supported by the chimney arrangement, with all four chimney stacks located to the north west and none to the south east.

Attached to the north west gable is a small single storey store with a corrugated asbestos roof, intersected by a high rubble wall, with a further row of stores attached beyond. The south east gable features a canted oriel window to the first floor with similar window frames.

The rear elevation has a complex arrangement. To the far left are stone steps ascending to a timber and glazed door at first floor level, providing access to the south east section, now largely occupied by a self-contained flat. Near the base of these steps is a fixed light six-pane window. To the right of the steps is a large sliding timber sheeted double door with a timber and glazed rear door and small sash window to its right. Directly above are two sash windows with Georgian panes and two smaller windows with six and four panes respectively. To the right is a full height gabled return with a single storey lean-to kitchen extension attached to its south east facade, featuring a large modern window and plain timber sheeted door. To the upper level of the return are two gabled half dormers, each with a sash window, shaped barges and finial. The gable of the return is blank. The north west facade of the return has a tripartite sash window with Georgian panes to the first floor. To the right, where the return intersects with the main house, is a small lean-to with a small window opening. Above this lean-to, at the first floor of the main house, is a much narrower sash window as the front. To the far right on the first floor of the main house are two small sash windows.