Maison Carrée is located on the Avenue de la Gare the D16 that runs from Chalabre towards Mirepoix. It is on the same side as the Rue du Communal (this street borders the garden).
The full address of the property is 357 Avenue de la Gare, 11230 Chalabre, France.
GPS: 42°59'06.5"N 2°00'22.3"E or 42.985143, 2.006196
If driving from the UK we usually get the Eurotunnel to Calais. If you ask Google maps for route it normally suggests the A26 , A1 route that takes you around the outskirts of Paris. We have always avoided that route and take the A16, A28 route towards Rouen.
So our route is Calais > Rouen > Évreux > Dreux > Chartres > Orléans > Limoges > Toulouse > Pamiers > Mirepoix > Chalabre
Route using Michelin route planner is here https://goo.gl/QrnPse
The nearest airports are Carcassonne Airport (50Km) or Toulouse (120Km)