Harrow Weald is bordered by Bushey Heath (north), Stanmore (west), Wealdstone (south), and is near to Headstone and Hatch End.

[2] Ancient woodland on high ground fills most of the northern part of Harrow Weald on the border of Greater London (and the traditional county of Middlesex) with Hertfordshire.

Along the southern edge of the high ground runs the road Old Redding and a car park here gives views over parts of London.

The house is named after the nearby earthwork Grim's Ditch, a 3-mile (4.8 km) long ancient monument that runs from Harrow Weald to Pinner Green.

It is run by a group of local volunteers who look after and maintain the park on behalf of the community and in collaboration with Harrow Council.

The south of the area is a suburban development with houses, schools, small shops, supermarkets and pubs (notably Bombay Central, formerly the Weald Stone Inn, and before that the Red Lion).

All Saints churchyard and its extension adjoin this cemetery and their most famous interment is of Leefe Robinson, a pilot who was awarded the Victoria Cross.