Design Feasibility & Risk Review

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A Design Feasibility & Risk Review is not about producing drawings, exploring concepts, or discussing style. It's about identifying what's already there. Learning about what constraints the site imposes, what risks prior work has introduced, and what decisions need to be made before any design work can responsibly begin.

Think of it as the professional equivalent of a pre-purchase inspection, except far more detailed in scope, and carried out by the team of licensed professionals you hire specifically because they have no interest in what gets built next. Their only job is to tell you the truth about what you're working with.

Existing conditions in a renovation. Non-compliant work that must be remediated before new design can proceed — Existing conditions require more time and money to fix than is often budgeted for. Non-compliant work needs to be addressed first — not designed around.

Most pre-construction problems don't originate with poor workmanship on the current project. They originate with prior work: existing hazardous materials, undisclosed or unpermitted alterations, and decisions made by previous owners that were either ignored, hidden behind fresh paint, or buried in the walls. By the time a contractor discovers them, they're your problem — and your cost.

The purpose of this review is to surface those issues early, when they're still manageable — before the drawings are started, before the contractor is on the clock, and before the project's budget has been committed to a scope that doesn't reflect reality.

What "Feasibility" Actually Means

Feasibility is often misunderstood as a simple yes-or-no question, or mistaken as "just another home inspection". In practice, it answers a more specific set of questions that most homeowners and designers skip over entirely:

Are there risks associated with the building lot itself?
Is there illegal or unpermitted work from prior owners that was never disclosed?
Does the zoning allow for the type of dwelling or use being considered?
Which decisions will drive cost and complexity the most?
- Is the septic system capable of handling the new fixture or occupant load?
- Are the stairs non-conforming and therefore untouchable?
- Are wall, ceiling, and floor assemblies code-compliant and is thermal performance rated for the HVAC system?
- Is the HVAC system too inefficient to be salvaged?
Where is the project most exposed to risk?
- Is the bearing capacity of the soil adequate for the extra loads for the new intended structure?
- Are there structural issues that must be corrected before new work proceeds?
- Are there open building permits (or no permit records at all) for prior work?
- Are there easements or encumbrances from neighbours, utilities, or existing structures?
What needs to be resolved before design can responsibly begin?
- How will illegal or unpermitted work be handled, and by whom?
- What steps are required to address an increased fixture or occupant load?
- Are there site conditions that directly affect the scope of what's being designed?

A feasibility review doesn't tell you what to build. It helps you understand what to consider before deciding to build, and it does so through the input of professionals hired specifically to be free of bias from anyone who stands to profit from construction proceeding.

Stone foundation covered by interior frost wall -- condition hidden until investigation reveals what remediation is required — Stone foundations require investigation. Their condition is often concealed behind interior frost walls, and remedial work tends to be deferred until it becomes unavoidable — and expensive.

What the Review Typically Uncovers

Every project is different, but a Design Feasibility & Risk Review consistently brings clarity to five areas. Each one represents a category of decision that, if left unresolved, will follow the project into construction and expand in cost.

Area 1

Site & Regulatory Constraints

Many projects encounter costly delays or full redesigns because site limitations are discovered too late. Zoning bylaws, shoreline setbacks, floodplain restrictions, and conservation authority requirements don't negotiate, and they don't wait until after drawings are finished.

The review identifies:

Maximum buildable lot area coverage and setback limitations
Building height restrictions, use permissions, and access considerations
Conservation authority jurisdiction, shoreline setbacks, and floodplain overlays
Mature tree protection, driveway access requirements, and service availability
Subdivision covenants or deed restrictions not visible in zoning alone

These factors determine what is realistically possible on the site. Even a partially complete set of drawings becomes useless when one of these constraints surfaces mid-project and forces a full redesign.

Area 2

Existing Conditions & Unknowns

Renovations to older homes, rural properties, cottages, and previously altered buildings carry a level of uncertainty that new construction doesn't. What's behind the walls is often not what anyone expects, and not what anyone disclosed.

The review helps clarify:

Whether the building is asbestos-free and lead-paint risk is understood
Structural limitations, load paths, and foundation or framing concerns
What can reasonably be retained as-is versus what requires replacement
What assumptions are currently being made without any investigation or verification
Whether existing conditions are unsafe or require correction before new work begins

Committing to a design scope without understanding existing conditions means committing to a budget that doesn't yet account for what will be discovered inside the walls.

Real-world impact

In one Ottawa suburban renovation, an existing basement apartment had been built without a building permit. The City ordered the owner of the building to immediately evict the tenant, demolish the existing basement kitchen, and write a letter of intent indicating the basement apartment would remain vacant until remedial work was done to bring the wall and ceiling assemblies up to code. This cost the owner $24K in annual revenue, which they were counting on to help offset their mortgage. The information needed to identify this situation was available at the municipal building department for a charge of $75.00. It was simply never requested before design on a renovation in another part of the house began.

Area 3

Building Envelope & Moisture Risk

Many long-term performance problems originate with the building envelope, the barrier that separates the conditioned interior from the unconditioned and hostile exterior environment. This is especially true for cottage-to-year-round conversions and homes more than 30 years old, where previous upgrades or oversights have created conditions that aren't visible from the outside.

The review may uncover:

Surface water management, roof drainage performance, and water table exposure
Thermal insulation gaps and indoor air quality implications
Below-grade water infiltration risks and waterproofing adequacy
Compatibility issues between existing assemblies and current building code requirements
Thermal package performance constraints — especially relevant if larger windows are part of the design intent

Knowing whether the current envelope can support the intended use — or whether it must be corrected first — is essential for building a project scope and budget that reflects reality.

Framing system outside of building code defined systems -- requires structural engineer review before design can proceed — Existing structural systems that fall outside of the building code's defined scope require a structural engineer's review before any design work can responsibly proceed.

Area 4

Early Cost & Complexity Drivers

While the review does not produce a detailed estimate or a remediation plan, it does identify the factors that will disproportionately affect project cost, the ones that tend to get discovered mid-construction when changing them is no longer straightforward.

The review helps identify:

Design decisions that carry outsized cost implications relative to their apparent complexity
Areas where scope expansion is likely due to concealed or deferred conditions
Complexity that isn't obvious from the initial project description or site photos
Where defining requirements carefully — rather than shoe-horning wants into the existing structure — materially reduces risk and cost

Understanding what drives cost before design begins is what allows a project budget to be built on real numbers rather than optimistic assumptions.

Area 5

Decision Sequencing — What Must Be Decided First

One of the most consistently valuable outcomes of a feasibility review is clarity around decision order. Not everything can or should be decided at once, and making decisions out of sequence is one of the primary ways projects accumulate unnecessary cost.

The review helps answer:

Which decisions must happen now, before design starts — and which can follow
How to address issues that arise in the most cost-effective sequence
Where the budget will absorb the greatest impact if the sequence is ignored
Which design approaches are not worth pursuing given the site's constraints
Which external consultants need to be engaged — and in what order — to support a thorough review and analysis

This prevents premature commitments that later need to be undone — or abandoned entirely.

What this review does not do

Produce permit drawings or any construction documentation
Provide design solutions or finalize layouts, materials, or finishes
Supply corrections or remediation plans for illegal or unpermitted work
Replace engineering assessments, structural reviews, or site surveys
Commit you to any further services with TLOL or any other firm

It is an independent, professional advisory step focused entirely on giving you the knowledge needed to make an informed decision about whether and how to proceed, not on selling you what comes next.

Who Benefits Most From This Review

This review is especially valuable for homeowners who are dealing with complexity, uncertainty, or existing conditions that haven't been fully investigated. In most cases, what the review surfaces saves more time, money, and stress than it costs.

Planning a renovation or addition on an existing home

Converting a cottage to year-round use

Remodelling a home built more than 30 years ago

Considering a new build on a complex site: waterfront, bedrock, treed, or steep terrain

Unsure what level of design services the project actually requires

Trying to avoid costly redesigns and mid-construction surprises

Evaluating whether a property is worth purchasing or proceeding with at all

Working with a builder who has flagged concerns about existing conditions

In many cases, this review provides a clear indication that the risk of proceeding outweighs the potential benefit, and that clarity, delivered early, is itself a significant return on the investment.

What You Gain From the Review

Clients typically leave the review with:

A clearer understanding of what's possible, and what's not, on their specific site
Awareness of risks while they're still manageable, not after commitments have been made
Better questions to ask builders, engineers, and other consultants before engaging them
Confidence in the next step, whether that's proceeding, modifying scope, or walking away from the project entirely

The best projects start here

If you're feeling uncertain, overwhelmed, or pulled in different directions at the outset of a project, that's often a sign that the foundational questions haven't been answered yet. It's not a reason to push forward faster, it's a reason to stop and get those answers first.

The best projects start with a clear understanding of what's possible and what costly mistakes to avoid. A feasibility review is how that understanding gets built, before the clock is running.