Hogarth exterior rear closed

One-Story Addition

A 300 sq.ft. one-storey addition with 600 sq.ft. ground floor renovation. Including the removal of the back wall of the existing ground floor, adding a large rear addition, replacing flooring and providing a stunning new kitchen.

Project Estimate



Wondering how much your home renovation project will cost? Searching online and talking to friends, family, and experts can be confusing. Accurate cost estimates can only be determined by assessing your property, understanding your needs, and running numbers with a professional.

You can use our price guide to get an idea of costs before investing in professional consulting, design, and estimating services.

Keep in mind these costs don't include taxes or rebates. Contact us today to schedule a call with one of our experienced renovation consultants.

Design & Project Management


Measure and document existing 1200 sf home.

Prepare Plans

Prepare floor plans and elevations of existing house and site plan as required for space planning.

Define Scope

Consult with architectural designer to define project scope and feature requirements.

Prepare Concepts

Prepare conceptual plans with required revisions.

Permit Drawings

Prepare detailed permit drawing package with necessary engineering for structural impact from removal of rear wall.

Interior Design

Prepare detailed cabinet drawings and finishes selections sheet, and provide finishes assistance from interior designer.

Engineer Review

Prepare hvac heat loss calculations and heating system design drawings by heating engineer.

Electrical Plans

Provide electrical and lighting plan for ground floor.

Obtain Permits

Obtain permits.

Project Management

Provide project management planning, oversight and supervision of construction.

Hogarth interior workspace detail
The built-in workstation makes this open-plan space even more functional.

Construction Scope

  1. 1.Demolish and dispose of all finishes and partitions throughout ground floor, exposing perimeter solid masonry walls.
  2. 2.Provide structural reinforcement of 2nd floor floor joists and/or add beams(s) as required to allow fully open concept at ground floor and provide stud walls at perimeter of ground floor to accommodate insulation.
  3. 3.Provide helical pile supports for new rear addition.
  4. 4.Provide framing for new rear addition, including dropped floor structure to ensure comfortable floor condition.
  5. 5.Provide roofing for new rear addition.
  6. 6.Provide patio door and two windows for new rear addition.
  7. 7.Provide perimeter animal-proof skirt for new rear addition.
  8. 8.Provide stucco exterior cladding and required aluminium soffit, fascia, eavestroughs and downspouts for new rear addition.
  9. 9.Provide modifications to existing ductwork as required to feed new rear addition.
  10. 10.Provide plumbing for kitchen and include good quality plumbing fixtures.
  11. 11.Provide electrical upgrades as required for renovated kitchen and code-compliant electrical at addition.
  12. 12.Provide code-compliant insulation at walls, ceiling and floor of new addition.
  13. 13.Provide drywall at walls and ceiling throughout addition and where necessary to make good at renovated kitchen area.
  14. 14.Provide tile flooring at front entrance and provide engineered wood flooring throughout ground floor.
  15. 15.Provide paint grade jamb extensions and casings as required at windows and doors at addition and provide paint grade baseboards at addition and to make-good at kitchen.
  16. 16.Provide custom cabinets and solid surface countertops, with stone backsplash.
  17. 17.Provide priming and painting (2 finish coats) throughout ground floor.

Additional Costs

Not included but potentially required or requested for this type of project.

$14,000 -> $35,000

Gas fireplace and decorative surround.

$5,000 -> $35,000

Modify, finish and/or replace ground to 2nd floor stairs and guardrails.

$5,000 -> $35,000

Added electrical and/or smart home AV electronics.

$8,000 -> $25,000

Added custom millwork/wall units.

Kitchen Appliances.

Above cost range figures include the costs of trade contractors, labour, materials, additional design, permits, project management and GC fees where applicable, but do not include HST