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Ontario now permits up to three residential units on many urban residential lots, for example a basement apartment and a garden suite alongside the main house. The details, however, are set by each municipality's zoning by-law, and they vary.

Before design starts, check four things: whether your zoning permits the unit type you want, whether the lot has the space and access the by-law requires, whether existing water, sewer and electrical services have capacity, and whether the building can meet fire separation, exit and ceiling height requirements.

A short feasibility review answers these questions before you spend money on full drawings. If the answer is yes, the same team can carry the project through design, permit and construction.

A load-bearing wall supports the floors and roof above it. When it is removed, a new beam has to carry that load, and the posts at each end have to bring it down to footings that can support it.

The process starts with an engineer confirming what the wall supports. The beam, posts and any new footings are then designed and drawn for a building permit. During construction, temporary shoring holds the structure up while the wall comes out and the beam goes in.

Skipping the engineering step is how sagging floors and cracked finishes happen years later. Done properly, the work is usually completed in days and inspected before the walls are closed.

A building condition assessment reviews the structure, envelope, roofing and mechanical and electrical systems of a property, and estimates the remaining life of each.

For buyers and lenders, the most useful part is the capital plan: which repairs are needed now, which are coming in the next five to ten years, and roughly what they will cost. That turns an inspection into a number you can negotiate with.

For commercial and multi-unit properties, the assessment is often required by lenders. For older houses before a major renovation, it shows what has to be fixed before new finishes go in.

Cold-climate air-source heat pumps keep working well below freezing, but their capacity drops as the outdoor temperature falls. Good design starts with an accurate heat-loss calculation for the coldest days, not a rule of thumb.

From there, the choices are about sizing, backup heat and distribution: whether existing ductwork can carry the airflow, whether a ducted or ductless system suits the house, and what provides heat during extreme cold snaps.

Improving the building envelope first, with air sealing, insulation and better windows, often allows a smaller and cheaper heat pump that runs more efficiently all year.

On a typical project, the architect, the structural engineer, the mechanical and electrical engineers and the contractor are hired separately. Each produces good work, but their drawings are checked against each other late, and conflicts are found on site.

When the same group designs, engineers and builds, coordination happens from the start. Ducts are routed around beams before anything is drawn in detail, costs are checked while the design can still change, and questions on site are answered by people who already know the project.

The result is fewer change orders, a more reliable schedule and one point of contact for the client.