What to Budget for Permit Drawings and Approvals Before Construction Starts

Almost every conversation we have with a homeowner starts in the same place: they know roughly what construction costs — they've heard the per-square-foot numbers, they've talked to a contractor cousin — but they have almost no idea what it costs to get to the point where a contractor can legally start. That gap is where projects quietly go over budget before they've even begun. So let's talk plainly about the phase nobody photographs: drawings, engineering, applications, and approvals.

Here in Ontario, you cannot pour a footing or move a load-bearing wall on the strength of a good idea. You need permit-ready drawings that a municipal plan examiner will accept, and depending on the scope, you need those drawings signed off by qualified designers and engineers. Budgeting for construction while treating the paperwork as a rounding error is the single most common planning mistake we see.

When people hear "permit drawings," they picture a floor plan. In reality a permit set is a coordinated package: dimensioned plans, elevations, building sections, structural details, and the code-compliance information a plan examiner needs to approve the work. For an interior renovation or a legal basement suite (an Additional Residential Unit), that package is relatively contained. For a two-storey addition or a custom home, it grows to include structural engineering, HVAC and energy compliance (SB-12), and often a site plan prepared from a current survey.

As a rough order of magnitude for the Greater Toronto and Hamilton area: a legal basement suite / ARU permit set typically runs somewhere in the range of $3,500 to $8,000 in design and drawing fees. A meaningful addition tends to land between $8,000 and $20,000 once structural engineering is included. A full custom home is a different animal — design and consultant fees commonly reach 8 to 15 percent of construction cost, because you're paying for months of design development, not a single drawing set. These are ballparks, not quotes, but they're honest ballparks.

Then there are the fees that don't go to your designer at all. The municipal building permit fee is calculated on floor area — often in the range of $15 to $25 per square metre of new or renovated space, with minimums that catch small jobs. Add a survey if you don't have a recent one ($1,500–$3,000), a Real Property Report or lot grading plan where required, and development charges on new dwelling units, which in some municipalities can be substantial. None of these appear in a contractor's quote, and all of them are due before you build.

If your project fits neatly inside the zoning by-law, your path is straightforward: prepare drawings, submit for a building permit, respond to any plan-examiner comments, and receive your permit. Budget six to twelve weeks for that review, longer in busy municipalities or over the winter backlog.

The moment your project doesn't fit — an addition too close to a side yard, a suite that needs an extra parking space, height or coverage over the limit — you're into a different process. A Minor Variance through the Committee of Adjustment adds application fees (often $1,500–$4,000 depending on the city), a public notice period, and a hearing. Realistically that's three to five months added to your timeline, plus the cost of a planner or designer to prepare the application and, sometimes, attend the hearing. A full rezoning is longer and more expensive still — measured in seasons, not weeks.

That's why the first money you spend should buy clarity, not deliverables. A modest upfront fee for a zoning and feasibility review — reading the by-law against your lot, confirming what's permitted as-of-right, flagging where a variance is likely — is the best-value dollar in the whole process. It tells you which budget you're actually in before you commit to the larger one.

A sensible way to plan is to set aside a pre-construction allowance separate from your build budget. For a typical addition or ARU, budgeting roughly $12,000 to $25,000 to cover design, engineering, survey, and permit fees is not pessimistic — it's realistic, and it keeps a variance or an extra consultant from derailing you. For a custom home, treat soft costs as a defined percentage from day one rather than a surprise.

Two more things worth building in. First, a contingency of ten to fifteen percent on the drawing phase, because scope evolves and plan examiners ask for revisions. Second, time. The paperwork phase for a straightforward addition is commonly two to four months from first sketch to permit in hand; anything requiring committee approval doubles that. If you need to be living in your finished space by a certain date, count backwards from that date through approvals — not from the day the shovel hits the ground.

None of this is meant to be discouraging. The pre-construction phase is where a project is actually shaped — where the difference between a permit that sails through and one that gets bogged down is decided. Budget for it honestly, sequence it properly, and the construction phase becomes what it should be: the part where a well-resolved plan simply gets built.