How do I use CubiCasa, Matterport, or iGUIDE floor plans with PlanSnapper?
All three produce to-scale floor plans that work perfectly with PlanSnapper. Export the floor plan image from each platform, prep it to remove labels, and upload.
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Why does appraisal square footage differ from the MLS listing?
MLS listings pull square footage from county records, builder estimates, or prior listings — none of which are required to follow ANSI Z765. Appraisers use exterior dimensions and exclude below-grade space, low-ceiling areas, and garages. The difference is usually legitimate, not an error.
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Does a walk-out basement count as GLA?
No. A walk-out basement does not count as GLA under ANSI Z765 — even with full windows, a sliding door, and direct grade access. If any portion of the floor is below the exterior grade line on any wall, the space is classified as below grade and excluded from GLA.
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Does unpermitted square footage count in an appraisal?
Unpermitted additions are typically excluded from GLA in a home appraisal. Appraisers can note contributory value for the space, but it cannot be counted as above-grade GLA under ANSI Z765 or Fannie Mae guidelines. The impact on value depends on condition, quality, and local market acceptance.
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Does a converted garage count as GLA?
A converted garage can count as GLA if it is above grade, finished to the same standard as the rest of the home, permanently heated, has a 7-foot ceiling over 50% of the area, and has interior access from the main living space. Permits matter too — an unpermitted conversion may be excluded even if it meets the physical requirements.
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How do you measure an L-shaped or irregular home for appraisal?
Break the exterior into rectangles, measure each separately, and add them together. Identify the interior corner of the L, treat each wing as its own rectangle, and be careful not to double-count the overlap area.
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Do covered porches, patios, or decks count as GLA?
No. Covered porches, screened porches, patios, and decks do not count as GLA under ANSI Z765. They must be reported separately. Only fully enclosed, heated, and finished above-grade space with adequate ceiling height qualifies as GLA.
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How do I measure a manufactured home for GLA?
Manufactured homes are measured from the exterior per ANSI Z765 — but exclude the hitch and any non-livable transport extensions. Additions count as GLA only if they are above grade, finished, heated, and directly accessible. Always measure yourself; do not rely on the HUD data plate square footage.
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Does an ADU (accessory dwelling unit) count as GLA?
Detached ADUs are separate structures and are never included in the main home's GLA under ANSI Z765. Attached ADUs may qualify if they are above grade, finished, heated, and have direct interior access to the main home — but local practice varies. Report ADU square footage separately in your appraisal.
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Does a loft count as GLA?
A loft can count as GLA if it is above-grade, finished, and meets the ANSI Z765 ceiling height requirement: at least 7 feet of ceiling height over 50% of the floor area. Open-to-below lofts are measured on their own level; only the actual floor area counts, not the open void.
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What is the difference between Gross Building Area (GBA) and GLA?
GBA includes all enclosed space in a structure -- finished, unfinished, above grade, and below grade. GLA counts only above-grade, finished, heated living space that meets ANSI Z765 ceiling height requirements. GBA is used for commercial and multi-family; GLA is the standard for residential appraisals.
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How do I measure an irregular or complex-shaped home for GLA?
L-shaped, T-shaped, U-shaped, and other irregular homes are measured by tracing the full exterior perimeter as a polygon, or by breaking the footprint into rectangles and summing the areas. ANSI Z765 exterior measurement rules apply. Digital tools like PlanSnapper handle any polygon shape automatically.
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How do I measure an A-frame home for GLA?
A-frame homes are measured normally at the main floor. On upper levels, only the area with at least 7 feet of ceiling height counts as GLA -- measure from the 5-foot ceiling line inward, not from the exterior wall. If the qualifying area covers less than 50% of the upper floor, the entire level is excluded.
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How do appraisers measure square footage?
Appraisers measure from the exterior of the home using ANSI Z765. They walk the perimeter, record each wall length, sketch each floor, and calculate above-grade GLA by summing finished, enclosed, above-grade area. Garages, porches, and below-grade areas are excluded and noted separately.
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Does a closet count as square footage?
Yes — closets count as GLA. Under ANSI Z765-2021, all finished above-grade interior spaces with adequate ceiling height are included, and closets meet that standard. Walk-in closets, reach-in closets, linen closets, and pantries all count. The only exception is closets in a finished basement, which are below-grade and excluded from GLA.
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Does a sunken living room count as GLA?
Yes. A sunken living room counts as GLA in virtually all cases. The interior step-down is a design feature, not a below-grade condition. GLA grade is determined by the relationship of the floor to the exterior ground, not to adjacent interior floors. On sloped lots, verify the sunken floor is still above exterior grade on all sides.
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Does a Florida room count as GLA?
It depends. Screen enclosures and unheated glass rooms do not count as GLA. A Florida room counts only if it is fully enclosed, heated and cooled by the home's HVAC, finished to the same standard as the rest of the home, and directly accessible from the main living area. Most Florida rooms do not qualify — MLS listings often include them anyway, causing discrepancies.
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How do you measure a garage conversion for square footage?
Measure a garage conversion the same as any room — from exterior walls — but only include it in GLA if it meets all ANSI Z765 criteria: finished to home standard, permanently heated, minimum ceiling height, and directly accessible from main living area. Unpermitted or partially converted garages frequently fail one or more of these tests.
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How much square footage discrepancy is acceptable in an appraisal?
No single universal tolerance exists. Fannie Mae uses a practical guideline of roughly 10% before requiring explanation, but the real test is whether the discrepancy materially affects value. Appraisers must measure independently, disclose any variance from public records, and adjust comparables consistently.
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What changed in ANSI Z765-2021?
The 2021 update clarified below-grade definitions (based on finished exterior grade, not interior floors), stairwell inclusion methodology, garage conversion requirements, and finished attic ceiling height rules. The core exterior-measurement principle for GLA did not change. Fannie Mae updated its Selling Guide to reference the 2021 version specifically.
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How do appraisers count home additions for square footage?
Permitted above-grade additions that are finished, heated, and directly accessible count as GLA. Unpermitted additions are typically excluded from GLA on lender-conforming appraisals. Garage conversions need permits, finished floors, and HVAC to qualify. The addition is measured from the exterior using the same ANSI Z765 methodology as the rest of the home.
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Why does the appraisal square footage differ from the tax record?
Appraisers measure exterior dimensions following ANSI Z765, producing an accurate GLA. Tax assessors carry forward older records, use interior measurements, or rely on permit data that may never have been field-verified. The appraiser's measurement is almost always more accurate. Gaps of 5–15% are common; over 15% warrants investigation.
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Can PlanSnapper replace a field measurement?
PlanSnapper measures from floor plans, not in the field. It can replace the manual calculation step when you already have a reliable, to-scale floor plan from CubiCasa, Matterport, iGUIDE, or a prior appraisal. It cannot substitute for a field visit when no floor plan exists or when physical conditions need verification.
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Does a garage count as square footage?
No. Garages do not count as GLA under ANSI Z765, regardless of whether they are attached or detached. They are reported separately on appraisals. A converted garage may count as GLA if it has been fully finished, heated, cooled, and permitted as living space — but most unpermitted conversions do not qualify.
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Can I dispute my appraisal square footage?
Yes. Submit a Reconsideration of Value (ROV) through your lender with supporting evidence: a competing floor plan measurement, a prior appraisal, or permit records. Fannie Mae requires lenders to have a formal ROV process. The strongest cases include a documented measurement with a stated methodology, not just a Zillow estimate.
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How do I measure a house when I don't have a floor plan?
Check previous appraisal reports, MLS listings, permit records, and builder files first — a floor plan may already exist. If not, scan services like CubiCasa ($25-30) generate a to-scale floor plan from phone photos in a few hours. As a last resort, sketch the exterior yourself, note the wall lengths, and upload a photo of the sketch to PlanSnapper.
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How do I read the scale on a floor plan?
Scale is usually printed in the title block (e.g., 1/4" = 1') or shown as a graphical scale bar. In PlanSnapper you don't need to calculate it manually — just pick any wall whose real-world length you know, click both endpoints, enter the length, and PlanSnapper handles the rest.
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How do I get a floor plan for my house?
Check your original purchase paperwork, MLS listing history, county assessor records, or contact the original builder. For newer homes a builder floor plan may be free online. If nothing exists, CubiCasa offers a $39-$99 DIY phone-photo scan that returns a to-scale floor plan in hours. A licensed appraiser or draftsperson can also measure and draw one for $150-$400.
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How do I verify square footage before buying a home?
MLS square footage is frequently inaccurate. Request the appraisal report if one exists, check county assessor records, obtain a floor plan and measure it yourself with PlanSnapper, or bring a laser measurer during your inspection. A 5% error on a 2,000 sq ft home at $250/sq ft is a $25,000 discrepancy.
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What are the appraisal sketch requirements for UAD?
UAD-compliant appraisals require a floor plan sketch showing all exterior dimensions, area calculations per level, and clear GLA vs non-GLA labeling. Sketches must use ANSI Z765-2021 exterior measurement methodology. Dimensions must be internally consistent — if they do not add up to your reported GLA, expect a Collateral Underwriter flag.
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Can PlanSnapper measure commercial buildings?
Yes — PlanSnapper measures any to-scale floor plan, including small retail, office, mixed-use, and multifamily buildings. It is built around ANSI Z765 for residential GLA, but the measurement tool itself works for any building type. For BOMA-certified commercial measurements (required for leases and institutional appraisals), a certified commercial measurement professional is still needed.
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Does a carport count as GLA?
Carports do not count as GLA under ANSI Z765-2021. They are open, unenclosed structures with no finished interior space. A carport converted into a fully enclosed, heated, and finished room can qualify — but the conversion must meet all GLA requirements and ceiling height minimums.
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Does a mudroom count as square footage?
Yes — a mudroom counts as GLA if it is finished, above grade, heated, and has at least 7-foot ceiling height. Most mudrooms attached to the main living area meet all of these criteria and are included in the exterior perimeter trace. An unfinished, unheated entry vestibule or an attached mudroom on a below-grade level would be excluded.
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Does a utility room count as square footage?
A utility room counts as GLA if it is above grade, finished, and permanently heated — even if it only contains mechanical systems. Laundry rooms, mechanical rooms, and HVAC closets that are accessible from the main living area and meet ceiling height requirements are included in GLA. A utility room in the basement or an unfinished mechanical space is excluded.
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Is Zillow square footage accurate?
Often not. Zillow pulls square footage from county tax records and MLS listings — neither independently verified. Errors of 5 to 20% are common due to outdated assessor data, unpermitted additions, basement inclusion inconsistencies, and agent data entry mistakes. For anything important — buying, selling, or insuring — verify the number from a to-scale floor plan.
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Can real estate agents use PlanSnapper for listings?
Yes. Agents use PlanSnapper to verify square footage before listing, catch discrepancies with assessor records, and support price-per-square-foot calculations in CMAs. Upload any to-scale floor plan, trace the exterior perimeter, and get above-grade GLA in under two minutes — matching the methodology appraisers will use at closing.
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How do you measure square footage from a PDF floor plan?
Upload the PDF to PlanSnapper — page 1 renders automatically as an image. Trace the exterior perimeter, set one known wall length as your scale reference, and click Calculate. Works with CubiCasa, Matterport, iGUIDE, architect, and appraisal PDFs. If your floor plan is on a later page, print that page to a new single-page PDF and upload that.
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Do stairs count as square footage?
Stairs count as square footage on the floor where they originate but not on the floor above, where the stairwell creates an open void that is excluded from GLA. The net result is that a staircase contributes roughly its footprint area once — not twice. Double-counting or zero-counting stairs is a $4,000 to $8,000 error in most markets.
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Are there square footage requirements for VA loans?
VA loans have no minimum square footage requirement. VA Minimum Property Requirements focus on habitability — adequate space for living, sleeping, cooking, and sanitation — not square footage numbers. VA appraisers measure GLA using the same ANSI Z765 exterior methodology as conventional appraisals.
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How do I calculate my home office deduction using square footage?
Divide your office square footage by total home square footage to get the business use percentage. Apply that to eligible home expenses (rent, utilities, mortgage interest) on IRS Form 8829. The simplified method deducts $5 per square foot up to 300 sq ft. Either way, you need accurate, documented square footage — estimates won't survive an audit.
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What is the difference between square footage and lot size?
Square footage is the finished living area inside the home (GLA). Lot size is the total land parcel area including yard, driveway, and outbuildings. They measure completely different things. GLA drives most of the per-square-foot value comparison in appraisals, while lot size adds a secondary premium that varies significantly by market.
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How do you measure an irregular shaped room?
Divide the room into rectangles (or right triangles), measure each one, calculate the area of each, and add them together. This decomposition method works for L-shaped, T-shaped, U-shaped, and any other non-rectangular layout. In PlanSnapper, simply trace each section as a separate polygon.
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How is condo square footage measured?
Condos are measured from interior wall surfaces, not exterior like a single-family home. The exact method (interior wall-to-wall, drip-line, or center-line of shared walls) depends on the condo declaration and local convention. This is why condo square footage often differs between MLS listings, county records, and an appraiser's measurement.
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