How to Read a Structural Engineer's Report (Homeowner Guide)

You've just received a 15-page structural engineer's report filled with terms like "differential settlement," "ultimate load capacity," and "flexural reinforcement." The contractor is waiting for your approval to proceed, but you have no idea what you're looking at.

This guide translates structural engineering reports into plain English, explains what each section means for your project, and helps you identify red flags before you commit to expensive foundation work.

When You Need a Structural Engineer's Report

Required by Building Code

Ontario Building Code **requires** a structural engineer's stamp for:

**Any structural modifications** — Removing or altering load-bearing walls, beams, or columns

**Foundation work** — Underpinning, foundation crack repairs affecting structural integrity

**Home additions** — Any addition that affects the existing structure's load paths

**Basement lowering** — Benching or underpinning to increase ceiling height

**Large openings** — New doors/windows in load-bearing walls

**Deck/balcony construction** — Elevated decks over 600mm (24 inches) high

Recommended for Your Protection

Even when not strictly required, get an engineer's report for:

**Foundation cracks** — Before spending $5,000+ on repairs, confirm what's actually wrong

**Sagging floors** — Determine if it's cosmetic settling or structural failure

**Old home renovations** — Buildings pre-1950 often have non-standard framing

**Drainage issues** — Differential settlement can indicate serious foundation problems

**Insurance claims** — Professional assessment supports your claim

**Cost in Ontario:** $500-$2,000 depending on scope and complexity

Anatomy of a Structural Report

1. Executive Summary / Conclusions

What it contains:

One-page overview of findings and recommendations

What to look for:

This is the only section many contractors read. It should clearly state:

Whether the structure is safe

What repairs are necessary (vs recommended)

Estimated scope of work

Whether immediate action is required

Red flags:

Vague language like "monitoring recommended" without specifics

No clear distinction between urgent and non-urgent repairs

Missing cost implications

"Further investigation required" without explaining why

Example — Good vs Bad:

**Good:** "The foundation exhibits vertical cracking at northeast corner consistent with differential settlement of approximately 25mm. Immediate underpinning is not required, but monitoring is recommended. If cracks widen beyond 6mm or show horizontal displacement, underpinning will be necessary at estimated cost of $18,000-$25,000."

**Bad:** "Foundation shows signs of settlement. Further monitoring recommended. See section 4.2 for details."

2. Site Observations

What it contains:

Description of what the engineer saw during the site visit

What to look for:

**Date and time of inspection** — Recent inspection more valuable

**Weather conditions** — Wet conditions reveal drainage issues

**Access limitations** — "Unable to inspect north wall due to finished drywall" means incomplete assessment

**Photographic documentation** — Should include photos with annotations

Key terminology decoded:

Engineering Term	What It Actually Means	Why It Matters
"Efflorescence observed"	White mineral deposits on concrete	Indicates water penetration
"Hairline cracking"	Cracks < 1mm wide	Usually cosmetic, not structural
"Differential settlement"	One part of foundation sinking more than another	Can indicate soil failure or drainage problems
"Spalling"	Concrete surface flaking off	Indicates freeze-thaw damage or corrosion
"Deflection observed"	Beam or floor sagging	May indicate overloading or decay
"Out of plumb"	Wall leaning	Potentially serious structural issue

3. Soil Conditions

What it contains:

Analysis of soil type and bearing capacity (often based on municipal soil surveys, not site-specific testing)

What to look for:

**Soil classification** — Clay, sand, silt, bedrock, or fill

**Bearing capacity** — Measured in kPa (kilopascals)

**Water table depth** — How close groundwater is to your foundation

**Fill soil notes** — Artificial fill is less stable than native soil

Ontario soil challenges:

Soil Type	Common Locations	Bearing Capacity	Foundation Implications
Glacial clay	Toronto, Hamilton, Ottawa	75-150 kPa	Expands when wet, shrinks when dry — differential settlement common
Sand/gravel	Waterloo, Niagara	100-200 kPa	Good drainage, stable bearing
Bedrock	Muskoka, Canadian Shield	1000+ kPa	Excellent bearing but excavation expensive
Fill (uncontrolled)	Older neighborhoods	Varies (50-100 kPa)	Unpredictable settlement, often requires deeper foundations

**Red flag:** If the report doesn't mention soil conditions or relies on "assumed" values without any verification, the engineer may not have done adequate investigation.

4. Load Calculations

What it contains:

Mathematical analysis of forces on structural elements

What to look for:

Most homeowners can't verify the math — and don't need to. What matters:

**Load types considered:**

- **Dead load** — Weight of the structure itself

- **Live load** — Weight of people, furniture, snow

- **Wind load** — Lateral forces from wind

- **Seismic load** — Earthquake forces (required in Ontario code)

**Safety factors** — Structures must handle 1.5-2.0× expected loads

**Code compliance statement** — Should explicitly reference Ontario Building Code 2012 (or current version)

Common load values (for reference):

Residential floor live load: 1.9 kPa (40 lbs/sqft)

Residential roof snow load: Varies by region (Toronto ~2.0 kPa, Ottawa ~2.4 kPa)

Bedroom/living areas: 1.9 kPa

Attics with storage: 2.4 kPa

**What this means:** If you're removing a load-bearing wall, the engineer calculates how much weight that wall was supporting and designs a beam to carry the same load plus safety factor.

5. Foundation Assessment

What it contains:

Evaluation of foundation walls, footings, and below-grade structure

What to look for:

Foundation wall condition:

Vertical cracks: Usually less concerning (often shrinkage)

Horizontal cracks: More serious (soil pressure)

Stepped cracks (following mortar joints): Moderate concern

Bulging or bowing: Serious structural issue

Crack measurement guidelines:

Crack Width	Severity	Typical Action
< 1mm (hairline)	Cosmetic	Monitor, seal if water intrusion
1-3mm	Minor	Seal, monitor for growth
3-6mm	Moderate	Repair, investigate cause
6mm+ (1/4"+)	Serious	Structural repair likely required
Any horizontal crack	Serious	Investigate immediately

Footing depth:

Ontario Building Code requires footings below frost line:

Southern Ontario: 1.2m (4 feet) minimum

Northern Ontario: 1.5m+ depending on zone

If footings are shallower, frost heave can cause movement and cracking.

6. Framing Evaluation

What it contains:

Assessment of above-grade structural elements (beams, joists, columns)

What to look for:

Load-bearing vs non-load-bearing identification:

Not all walls carry structural loads. The report should clearly identify which walls are load-bearing. Clues engineers look for:

Wall runs perpendicular to floor joists (usually load-bearing)

Wall aligns with beam or foundation wall below

Double top plate visible in wall framing

Absence of wall on floor below (usually not load-bearing)

Beam sizing:

If you're removing a wall, the engineer specifies replacement beam size. Example:

"Install (1) 4-1/2" × 14" PSL beam spanning 16'-0" supported on (2) 4×6 columns at each end."

**Translation:** Install one 4.5-inch wide by 14-inch deep engineered lumber beam spanning 16 feet, held up by doubled 4×6 posts at both ends.

Wood species and grade matter:

SPF (Spruce-Pine-Fir) #2 grade — Common for framing

Douglas Fir-Larch #1 — Stronger, used for long spans

PSL/LVL/Glulam — Engineered lumber, strongest options

7. Recommendations Section

What it contains:

Specific repair or remediation steps

What to look for:

**Prioritization:** Good reports separate:

**Immediate safety concerns** — Address within weeks

**Short-term recommendations** — Address within 1-2 years

**Long-term monitoring** — Check annually or after events

**Specificity:** Recommendations should be detailed enough to bid, not vague.

**Vague (bad):** "Repair foundation cracks as necessary."

**Specific (good):** "Install (6) helical piers at locations marked on attached site plan, extending to minimum depth of 16 feet or refusal on bedrock. Piers to be loaded to 15 kips minimum. Seal cracks with epoxy injection after stabilization is verified."

8. Engineering Drawings

What it contains:

Technical drawings showing:

Site plan

Foundation plan

Framing plan

Details and sections

What to look for:

The engineer's stamp:

Every structural drawing page in Ontario must include:

Engineer's seal (round Professional Engineer stamp)

Signature across the seal

Date signed

Project address

**Without a proper stamp, the drawings are legally worthless** — no building permit will be issued.

Drawing elements:

Symbol/Line Type	Meaning
Thick solid line	Existing elements to remain
Dashed line	Elements to be removed
Double line with fill	New elements to be added
Dimension with arrows	Measurements (usually in mm or feet-inches)
Circle with number	Detail reference (see detail drawings)
Grid lines (A, B, C / 1, 2, 3)	Reference system for locating elements

Scale:

Most drawings are 1/4" = 1'-0" scale. A ruler won't help — use the dimension numbers provided.

Understanding Common Structural Solutions

Underpinning

**What it is:** Extending foundation depth or adding support below existing footings

When specified:

Foundation settling due to inadequate depth

Basement lowering (benching)

Adjacent excavation requiring support

Soil failure under existing footings

Typical specification:

"Underpin foundation at 4-foot intervals using mass concrete pits extending to minimum 4-foot depth below existing footing or to competent bearing soil, whichever is deeper."

**Cost:** $18,000-$35,000 for typical basement (see our [underpinning cost guide](/costs/underpinning))

Helical Piers

**What it is:** Steel shafts with helical plates screwed into soil to support or stabilize foundations

When specified:

Foundation settlement due to poor soil

Alternative to traditional underpinning

Situations where excavation is impractical

Typical specification:

"Install 2-7/8" diameter helical piers to minimum depth of 15 feet or 5 turns into competent bearing stratum. Load test to 1.5× design load (22.5 kips)."

**Cost:** $1,200-$2,000 per pier installed

Structural Beam Installation

**What it is:** Installing a beam to carry loads when removing load-bearing walls

When specified:

Opening up floor plans (removing walls)

Supporting floors above removed walls

Replacing undersized existing beams

Typical specification:

"Install (1) 5-1/8" × 18" Glulam beam spanning 20'-0" with 3-1/2" bearing at each end on new 6×6 columns bearing on existing foundation wall."

**Cost:** $2,500-$6,000 depending on span and access

Foundation Crack Repair

**What it is:** Sealing cracks to prevent water entry and further deterioration

When specified:

Cracks > 3mm wide

Any crack with active water infiltration

Cracks showing signs of movement

Typical specification:

"Repair cracks using low-pressure epoxy injection per ASTM C881. Inject from interior, seal exterior with elastomeric membrane if accessible."

**Cost:** $400-$800 per crack for professional epoxy injection

Red Flags in Structural Reports

1. "Monitor and Observe"

**What it says:** "Recommend monitoring for changes over 6-12 months."

**Red flag when:** There's no clear criteria for what constitutes a problem or when to take action

**What to ask:** "What specific measurements or changes would trigger the need for repair? How do I monitor this?"

2. Scope Limitations

**What it says:** "Assessment limited to areas accessible at time of inspection."

**Red flag when:** Large portions of the structure weren't inspected (finished walls, inaccessible crawl spaces)

**What to ask:** "Do we need to open walls or floors to complete the assessment before proceeding?"

3. Missing Cost Implications

**What it says:** Recommendations without any mention of typical costs

**Red flag when:** You can't budget for the recommendations

**What to ask:** "What's the typical cost range for these recommendations in Ontario?"

4. Vague Timeline

**What it says:** "Repairs should be completed in due course."

**Red flag when:** No urgency indicated for potentially serious issues

**What to ask:** "Is this safe to leave for 6 months while I budget? 2 years? Or urgent?"

5. No Code References

**What it says:** Generic recommendations without citing specific building code sections

**Red flag when:** Especially concerning for permit-required work

**What to ask:** "Which OBC sections apply to these recommendations?"

Questions to Ask Your Engineer

Before accepting the report, clarify:

**"Is the structure currently safe to occupy?"** — Sounds dramatic, but you need a clear yes/no answer

**"Which recommendations are required by code vs nice-to-have?"** — Helps prioritize budget

**"What happens if I don't make these repairs?"** — Understand consequences of deferring work

**"Do these repairs require building permits?"** — Factor permit cost and timeline

**"Will you review contractor bids to ensure they match your specifications?"** — Many engineers offer this service for $200-$400

**"Can you recommend contractors experienced with this type of work?"** — Engineers often know qualified specialists

Using the Report to Get Accurate Bids

Don't Just Hand It to Contractors

Many contractors will:

Bid only on easy/profitable parts

Ignore specifications they don't understand

Substitute cheaper methods not approved by engineer

Instead, Do This:

**Highlight key specifications** — Mark beam sizes, depths, materials on the drawings

**Extract scope into a simple list** — "Install 5-1/8×18 Glulam beam, 20-foot span, supported on 6×6 posts..."

**Ask for line-item pricing** — Per-pier cost, per-beam cost, etc.

**Require engineer review** — Contract should state "work to be performed per structural drawings by [Engineer Name], dated [Date], subject to engineer's review"

**Include drawing package** — Every bidder gets full drawings, not just summary

Cost Verification

Typical markups over materials/labor:

Work Type	Material Cost	Labor Cost	Total Typical	Markup
Beam installation (20ft Glulam)	$800-$1,200	$1,500-$2,500	$3,000-$5,000	20-30%
Helical pier (per pier)	$400-$600	$600-$1,000	$1,200-$2,000	25-35%
Underpinning (per lineal foot)	$150-$250	$200-$350	$400-$700	15-25%

If bids are **more than 40% above these ranges**, ask why. Legitimate reasons include:

Difficult access (narrow lots, no excavator access)

Need for specialized equipment

Engineering oversight fees included

Permit costs included

Finding a Licensed Professional Engineer (P.Eng)

Where to Look

Professional Engineers Ontario (PEO) Directory:

www.peo.on.ca — Search by specialty (structural) and region

Requirements to verify:

Current PEO license (check license number on PEO website)

Professional liability insurance ($2M minimum)

Experience with residential structural work

References from similar projects

Cost Ranges by Project Type (Ontario, 2026)

Service	Typical Cost	What's Included
Foundation crack assessment	$500-$800	Site visit, brief report, photos
Load-bearing wall removal	$800-$1,500	Calculations, beam specification, stamped drawings
Underpinning design	$1,200-$2,000	Soil analysis, full drawings, stamped plans
Home addition structural	$1,500-$3,000	Complete structural package for permit
Full house assessment (pre-purchase)	$1,000-$2,000	Comprehensive inspection and report

Questions to Ask Before Hiring

**"Are you a licensed P.Eng in Ontario?"** — Verify license number

**"How many residential projects have you stamped in the past year?"** — Want someone current with residential work

**"Do you provide contractor review services?"** — Valuable for ensuring work matches plans

**"What's your typical timeline?"** — 1-2 weeks for simple projects, 3-4 weeks for complex

**"Do you work with any specific contractors?"** — Not a red flag, but good to know about relationships

After the Report: Next Steps

1. Understand Permit Requirements

Most structural work requires building permits:

Submit engineer's stamped drawings to building department

Pay permit fees ($300-$1,000 depending on scope)

Schedule inspections (usually: start of work, rough-in, final)

Timeline: 2-4 weeks for permit approval

2. Get Multiple Contractor Bids

**Minimum 3 bids** from contractors experienced with structural work

Verify before hiring:

WSIB clearance (essential for excavation/structural work)

Liability insurance ($2M+ for structural projects)

References from similar structural projects

Engineer's approval of their approach

When you hire through [RenoNext](/pros), every contractor is pre-verified for WSIB, insurance, and technical qualifications — no need to verify credentials yourself.

3. Plan for Contingencies

**Budget 15-20% contingency** for structural projects. Common surprises:

Unexpected conditions when opening walls (rot, previous bad repairs)

Soil worse than anticipated (requires deeper underpinning)

Related work revealed (crack repair reveals drainage issues)

Material price increases (steel, lumber volatility)

4. Document Everything

Before work starts:

Photograph existing conditions

Mark all cracks with dated tape

Video walk through basement/affected areas

During work:

Photo progress at each stage (especially before walls close up)

Keep copies of inspection reports

Collect material certifications (beam grade stamps, concrete test results)

After completion:

Final photos of completed work

Engineer's sign-off letter (if review service was included)

Building department final inspection approval

Warranty documentation

When using [RenoNext](/how-it-works#proof), this documentation is automatically captured and added to your [HouseFax](/house-fax) — creating a permanent, verified record that protects your investment and adds value at resale.

Frequently Asked Questions

Q: Can I proceed with structural work without an engineer's report if my contractor says it's not needed?

A: No. Ontario Building Code requires engineer's stamped drawings for any structural modification, foundation work, or home addition. Proceeding without proper engineering is illegal, will fail building inspection, may void your insurance, and creates liability if something fails. Always get the engineer's stamp, even if it adds $1,000-$2,000 to your project budget.

Q: What's the difference between a home inspector's report and a structural engineer's report?

A: Home inspectors provide general condition assessments but cannot make structural determinations or stamp drawings for permits. Structural engineers are licensed professionals who can perform load calculations, design structural solutions, and provide stamped drawings for building permits. For serious foundation issues, sagging floors, or structural modifications, you need an engineer, not just an inspector.

Q: How long is a structural engineer's report valid?

A: Most municipalities accept structural reports for 1-2 years from the date of stamping. If your project is delayed, you may need the engineer to re-stamp the drawings with a current date (usually $200-$400). Site conditions can also change — if significant time passes, the engineer may require a new site visit before re-stamping.

Q: Should I get a second opinion if the first engineer's report seems expensive to implement?

A: Yes, getting a second structural opinion is reasonable, especially for major work like underpinning ($20,000-$40,000). However, if two independent engineers reach similar conclusions, the problem is likely real. Be wary of engineers who dramatically underestimate scope — structural failures are expensive and dangerous. Sometimes the answer you don't want to hear is the correct one.

Q: Can I make changes to the engineer's plans during construction?

A: Any deviation from stamped structural drawings requires engineer approval and revised stamped drawings. Never let a contractor "improvise" structural solutions, even if they "know a better way." Unapproved changes void the engineer's liability, may fail building inspection, and can create serious safety hazards. If field conditions require changes, stop work and consult the engineer.

Protecting Your Investment

Structural work is expensive — foundation repairs, beam installations, and underpinning projects often run $15,000-$40,000+. The engineer's report is your roadmap to getting it done right the first time.

Get Started with Confidence

**Understand what you need** — Use [RenoNext's Price Check](/price-check) to estimate costs for structural work

**Find verified structural contractors** — Browse [licensed pros](/pros) experienced with foundation and structural projects

**Protect your payments** — Use escrow payment protection to pay as work progresses, not all upfront

**Document everything** — Automatic HouseFax recording creates permanent proof of proper structural work

Every structural project through RenoNext includes verified contractor credentials, escrow payment protection, and complete photo documentation added to your HouseFax. When you eventually sell your home, you'll have professional proof that structural work was engineered properly and built to code — invaluable for buyer confidence and home value.

**Don't gamble with your foundation.** [Find qualified structural contractors now](/pros) and get your project done right.

How to Read a Structural Engineer's Report (Homeowner Guide)