A masonry inspection before buying a home is one of the most valuable due-diligence steps a buyer of any brick property can take, and most buyers skip it entirely. A general home inspector will note cracked mortar or a damaged chimney cap in a written report. What that report will not tell you is whether prior repairs used mortar incompatible with the brick, whether steel lintels are corroding behind the brick above the windows, or whether foundation joints are quietly letting water into the basement wall. On older North Shore homes, those are the numbers that move a negotiation.
The standard home inspection and a dedicated masonry inspection look at the same wall and see different things. This post explains what a masonry inspection covers, why it matters more on some homes than others, and how to use the findings before you close.
What a Masonry Inspection Before Buying a Home Actually Covers
A general home inspector walks the perimeter and notes visible surface conditions. Crack here, missing cap there, efflorescence on the foundation. That report is useful. It is not a masonry assessment.
A masonry contractor performing a pre-purchase inspection does a different set of tasks. On the exterior walls, the work includes testing mortar hardness against brick hardness to determine whether prior repairs used the correct material, identifying spalling patterns that signal moisture trapped behind the mortar joint, and assessing the depth of mortar recession by elevation. These three tasks alone distinguish between a home that needs $1,800 of scheduled tuckpointing and one that needs $12,000 of immediate repair including brick replacement.
Per NPS Preservation Brief 2, repointing mortar in historic masonry must be softer than the brick it contacts. Identifying whether this rule was followed in prior repairs is a masonry-specific judgment that general inspectors are not positioned to make.
On the chimney, a thorough inspection means roof access. From the ground with binoculars, a contractor can see whether the cap is intact. From the roof, they can see crown cracks that are two years away from a partial rebuild, flashing separation at the roofline, and mortar erosion on the top courses that a bird’s-eye angle makes obvious. Many buyers discover after closing that their general inspector’s “minor chimney deterioration” note actually described a $3,000 to $6,000 partial rebuild.
Lintel assessment is the third area that general inspectors routinely underinvestigate. Steel lintels are the structural members spanning window and door openings, and they corrode. When they corrode, they expand. Expanding steel pushes the brick above the opening outward. The early signature is a horizontal crack in the mortar joint directly above a window, sometimes with rust staining on the brick face below. The cost of lintel replacement plus brick reset runs $2,000 to $5,000 per opening. A 1970s Deerfield colonial with five windows showing early rust signatures carries a potential $10,000 to $25,000 exposure the general inspector priced at zero.
For more detail on what lintel rust looks like and when it becomes urgent, see Lintel Repair: Steel, Stone, and Window Openings.
Why Housing Era Changes What You Are Looking For
The inspection questions on a 1925 Evanston greystone are fundamentally different from the questions on a 1974 Northbrook colonial. Both homes need a masonry assessment. The specific failure modes, and the cost exposure, differ substantially.
Older homes from the 1890s through the 1940s used soft Chicago common brick, originally laid in lime or lime-rich mortar. As the NPS Preservation Brief 2 documents, the mortar was intentionally softer than the brick so that seasonal movement and freeze-thaw stress would flex and erode the mortar joint rather than fracturing the brick face. That is the correct system. What disrupts it is when a later owner had the home repointed with Portland cement mortar. Type S cement mortar carries a minimum compressive strength of 1,800 PSI and Type M carries 2,500 PSI per ASTM C270, both significantly harder than soft historic brick. Moisture trapped between the hard mortar and the soft brick freezes, expands, and pops brick faces off. The repair becomes the source of the damage.
Post-war homes from the 1950s through the 1980s used harder machine-pressed brick and Portland cement mortar that was period-appropriate. The failure modes here differ: builder-grade mortar reaching end of service life at 40 to 60 years, steel lintels corroding on 1960s and 1970s construction, and chimney crowns poured thin without adequate reinforcement.
Understanding which era and which failure mode you are dealing with determines both the scope of what to look for and the cost of what you find.
Historic Evanston and Winnetka Homes: The Costliest Surprises
Evanston has the oldest and most varied residential brick stock on the North Shore. The city’s primary building era runs from the 1890s through the 1940s, with a median home age around 1939. The common brick is soft Chicago common brick, and the correct mortar for any repair work is Type O or a lime-based Type N. The documented top problem: prior Portland cement repairs causing spalling on soft original brick.
Here is what that looks like on a pre-purchase inspection and why it often gets underpriced. The repointed sections may look intact from four feet away. The mortar lines are crisp and present. What requires closer examination is the brick face within a half-inch of those joints. On a home where Portland cement mortar has been on soft brick for ten or fifteen years, you begin to see fine crazing on the brick surface near the joint, then shallow flaking, then concave depressions where the brick face has actually separated. That is irreversible. Replacement requires sourcing period-matching salvage brick, which adds time and cost.
Evanston greystones add another layer. A greystone uses Indiana limestone facing over common brick backing. Limestone joints and brick joints require different mortar formulations per BIA Technical Note 7B, and damage to limestone facing requires specialized repair techniques, including consolidated injections or dutchman patches, rather than simple repointing. Buyers of Evanston greystones need a masonry contractor who has specifically worked on limestone-over-brick construction. For the full picture on soft brick and lime mortar compatibility, see What Causes Brick Spalling and How to Prevent It.
Winnetka’s housing stock runs 1920s through 1960s, built predominantly with soft Chicago common brick and original lime mortar on Georgian, Colonial Revival, and Tudor homes. Winnetka adds a specific climate factor not present in inland communities: direct Lake Michigan exposure on east-facing facades. East walls on Winnetka homes take moisture-laden air off the lake, freeze-thaw more aggressively than protected sides, and show mortar erosion two to three times faster than south-facing walls on the same home. A pre-purchase inspection on a Winnetka home should include careful documentation of east-elevation condition, not just a general perimeter walkthrough.
Multiple Winnetka properties appear on the National Register of Historic Places. The village has an Architectural Review Committee that oversees exterior changes on many properties. A buyer should confirm whether the specific property carries designation or contributing-structure status, because repair methods, mortar specifications, and permit requirements follow from that. Incorrect repairs on a designated Winnetka property do not just damage the brick. They can complicate future permitting and affect the property’s historic standing. For more on how historic preservation requirements affect masonry work, see Historic Masonry Restoration: Preserving Chicagoland Heritage.
Post-War Northbrook and Deerfield: Different Failure Mode, Still Real Money
Northbrook’s primary building era is 1950s through 1980s, with a median home age around 1968. The common brick is hard machine-pressed. The documented top problem: builder-grade mortar reaching end of service life after 40 to 60 years of freeze-thaw cycling.
On a 1968 Northbrook split-level, the mortar joints on the chimney, garage wall, and north-facing facade are likely showing recession and cracking. The brick itself is durable. The mortar holding it together is not. What makes Northbrook assessments distinct is the chimney situation. Split-level and ranch chimneys sit fully exposed above low rooflines with no wind protection and are almost always further along in deterioration than wall mortar on the same house.
A buyer looking at a 1971 Northbrook colonial should expect the chimney to need attention: full four-side tuckpointing runs $800 to $2,500 in the Chicagoland market for a standard residential chimney. Crown cracking or cap replacement adds $200 to $600. A partial rebuild, if the top courses have deteriorated sufficiently, runs $3,000 to $6,000. These are not surprises if the inspection covers the chimney at roof level. They are surprises when the general inspector’s note said “some deterioration noted on chimney” and a buyer assumed that meant a few hundred dollars.
Deerfield’s primary building era is 1960s through 1980s, with a median home age around 1970. The documented distinctive problem is window and door lintel rust causing brick displacement. Steel lintels on Deerfield colonials and ranches are corroding after decades of moisture exposure. The early sign is a horizontal crack in the mortar joint directly above a window opening, with rust staining on the brick below. Lintel replacement plus brick reset for a single opening is $2,000 to $5,000. A Deerfield colonial built in 1975 may have five to eight window openings at the same age and the same moisture exposure. An inspection that does not specifically examine lintel condition above every opening is not giving you an accurate picture of what you are buying. For more on how to read these crack patterns, see How to Read Cracks in a Brick Wall.
What a Masonry Inspection Will Find That a General Inspection Misses
It helps to be specific. Here are the items that consistently appear on masonry inspection reports for older brick homes in the Chicago area but routinely go unaddressed or underpriced on general home inspection reports.
Mortar chemistry mismatch. A general inspector documents that mortar is present or absent. A masonry contractor assesses whether the existing mortar is compatible with the brick and flags prior repointing that used harder material than the original system. This one item can represent $5,000 to $20,000 in eventual brick replacement costs on a soft brick home.
Soft brick condition under repointed sections. General inspectors look at surfaces. Masonry contractors look at what is happening at the joint-to-brick interface, where incompatible prior repairs manifest as early spalling.
Chimney crown integrity from roof level. Crown cracks invisible from the ground become obvious at three feet. A small crown crack caught before a full Chicago winter of water infiltration costs $200 to $600 to seal or replace. The same crack left two or three winters produces $3,000 to $6,000 of partial rebuild.
Lintel condition above all windows and doors. Checked individually, not as a class. Early rust on three lintels prices very differently than active displacement on seven.
Foundation joint condition at grade level. The transition between above-grade masonry and the foundation, where splash-back from rain and snowmelt concentrates moisture, is one of the first places joints fail. Water entering here reaches basement interiors and framing.
Evidence of prior injected sealants or surface coatings. A coat of elastomeric paint applied to a brick exterior may have been installed to stop a leak that was never properly repaired. Finding it should prompt further investigation into what it was covering.
How to Use the Findings in Negotiation
A written masonry inspection report with an itemized repair estimate is a negotiating document. The two most common approaches are a price reduction equal to the repair estimate or a seller credit at closing. Either approach requires the estimate to be written, itemized by scope, and from a contractor who would actually do the work.
General rule: ask for the full estimate amount if repairs are urgent water-exposure risks. Failed chimney crowns, open mortar joints on north and east exposures, and active lintel rust displacement all qualify as items that will cost more if left through another winter. Deferred maintenance items, like stable cosmetic erosion on a protected south wall, are harder to win on in negotiation because a seller can reasonably argue the buyer can defer them too.
On high-value North Shore homes in Winnetka or Lake Forest, where masonry conditions involve historic preservation requirements and premium materials, the estimates themselves can surprise buyers. Historic preservation-compliant work requires custom lime mortar formulations, period-matching brick from salvage sources, and techniques that take longer than standard tuckpointing. The per-foot cost on a Winnetka Georgian can run substantially above the $8 to $25 per linear foot range that applies to standard residential work. Getting a genuine estimate from a contractor experienced in preservation work, not a ballpark from a contractor whose business is tract-home tuckpointing, is the only way to price this accurately.
For guidance on reading a masonry repair estimate once you have one, see How to Read a Masonry Repair Estimate. For a broader look at how masonry condition affects what a home appraises and sells for, see Masonry and Home Resale Value.
Before Closing: The Practical Sequence
Most purchase contracts allow the buyer to commission third-party specialty inspections during the due-diligence window. A masonry inspection is appropriate for any brick home, and essentially mandatory for any pre-1960 soft brick home in Cook or Lake County.
Contact a masonry contractor during the same week as your general home inspection. Provide the address and ask whether they have experience with the home’s era and construction type. Schedule the inspection to allow time for the written estimate to come back before your inspection contingency expires, since you will want the estimate in hand before deciding whether to proceed, negotiate, or walk.
Walk the property with the masonry contractor if you can. Ask them to explain what they are seeing and why it matters. The education you get from that walkthrough is worth having whether or not you buy the home.
For guidance on selecting a masonry contractor qualified to assess historic and soft brick construction, see How to Choose the Right Masonry Contractor in Illinois. For context on how masonry deferred maintenance affects resale position on both sides of a transaction, see Masonry and Home Resale Value.
Scheduling a Pre-Purchase Masonry Inspection
We perform pre-purchase masonry inspections across Chicagoland’s North Shore and northwest suburbs. We have specific experience with the soft brick and lime mortar systems on historic Evanston, Winnetka, and Kenilworth homes, and with the post-war hard brick and lintel issues common in Northbrook, Deerfield, and Highland Park.
We serve buyers in Winnetka, Evanston, Wilmette, Northbrook, Deerfield, Highland Park, Lake Forest, Kenilworth, and throughout the North Shore and Lake County. Call (847) 713-1648 or contact us online to schedule your inspection during your due-diligence window. We provide written reports with itemized estimates. We have been working these streets since 1987.
For guidance on what to do once you own the home, see 5 Signs Your Chimney Needs Immediate Repair and What Causes Brick Spalling and How to Prevent It. And for a full picture of what masonry maintenance costs on an ongoing basis, see Tuckpointing Cost in Illinois 2026.
The home inspector flagged a hairline crack in the chimney. The masonry inspector found three steel lintels beginning to rust and prior Portland cement repointing on 1930s soft brick. Same house, very different picture.