An extension project must also:

• Consider the character of the building to be extended, including its type, expression and architectural characteristics such as cladding, cornices and openings;
• Take into account the effect of extensions on similar buildings with respect to the size, position in relation to the main building and the architectural characteristics of such extensions;
• Respect, enhance or adapt to the architecture of the fence, grille, wall, stairway or building or be compatible with it in form and materials, in accordance with their architectural value.

6.1.3 Landscaping

• Borough by-laws must set rules or criteria to require that the development of a front yard be carried out by maximizing the vegetation cover and by limiting the areas used for the development of an authorized parking area and lanes for vehicular and pedestrian traffic. Borough by-laws may contain provisions authorizing a front yard before the development of a terrace in cases where other yards are not available for that purpose.
• The planting of the following species must be prohibited under borough by-laws:
  • Garlic mustard (Alliaria petiolata);
  • Wild chervil (Anthriscus sylvestris);
  • Dog-strangling vine (Cynanchum rossicum);
  • Black swallowwort (Cynanchum nigrum);
  • Snow-on-the-mountain (Aegopodium podagraria);
  • Norway maple (Acer platanoides);
  • Alder buckthorn (Rhamnus frangula);
  • Common buckthorn (Rhamnus cathartica);
  • Siberian elm (Ulmus pumila);
  • Lesser periwinkle (Vinca minor);
  • White poplar (Populus alba);
  • Japanese knotweed (Fallopia japonica);
  • Purple loosestrife (Lythrum salicaria).
• Borough by-laws must set criteria requiring that landscaping projects that include a fence, grille, wall, stairway, path, terrace, an inground swimming pool, cluster or row of trees, be undertaken while respecting the value of the archaeology, landscape, vegetation and existing topography of the site so as to ensure their integration into the building and the environment. 

For that purpose, a landscaping project must:

• Take into consideration the character of the building, lot, existing design and plantings, original design, the landscape of neighbouring sites and their integration with buildings of the same type;
• Limit mineralized areas and maximize vegetation covers; 
• Respect, enhance or adapt to the landscape, vegetation and topography of the site or be compatible with them, according to their importance as representative, interesting, exceptional or unique elements of the environment;
• Be designed in full knowledge of the archaeological remains on the site without disturbing remains that may be the subject of archaeological digs, be left in place or be showcased, according to their documentary or educational value;
• Respect or enhance the views between a public space, the river and all exceptional natural or built elements, in accordance with their importance as characteristic or unique views and the level of attendance of the public spaces (scenic lookouts, public thoroughfares, institutions, paths) from which these views are possible.