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2. Limitations, Exceptions & Exclusions

1. Definitions & Scope

3. Standards of Practice

3.1 - Roof

3.2 - Exterior

3.3 - Basement, Foundation, Crawlspace & Structure

3.4 - Heating

3.5 - Cooling

3.6 - Plumbing

3.7 - Electrical

3.8 - Fireplace

3.9 - Attic, Insulation & Ventilation

3.10 - Doors, Windows & Interior

4. Glossary of Terms

Table of Contents

2. Limitations, Exceptions & Exclusions

1. Definitions & Scope

3. Standards of Practice

3.1 - Roof

3.2 - Exterior

3.3 - Basement, Foundation, Crawlspace & Structure

3.4 - Heating

3.5 - Cooling

3.6 - Plumbing

3.7 - Electrical

3.8 - Fireplace

3.9 - Attic, Insulation & Ventilation

3.10 - Doors, Windows & Interior

4. Glossary of Terms

Table of Contents

2. Limitations, Exceptions & Exclusions

1. Definitions & Scope

3. Standards of Practice

3.1 - Roof

3.2 - Exterior

3.3 - Basement, Foundation, Crawlspace & Structure

3.4 - Heating

3.5 - Cooling

3.6 - Plumbing

3.7 - Electrical

3.8 - Fireplace

3.9 - Attic, Insulation & Ventilation

3.10 - Doors, Windows & Interior

4. Glossary of Terms

Table of Contents

2. Limitations, Exceptions & Exclusions

1. Definitions & Scope

3. Standards of Practice

3.1 - Roof

3.2 - Exterior

3.3 - Basement, Foundation, Crawlspace & Structure

3.4 - Heating

3.5 - Cooling

3.6 - Plumbing

3.7 - Electrical

3.8 - Fireplace

3.9 - Attic, Insulation & Ventilation

3.10 - Doors, Windows & Interior

4. Glossary of Terms

Table of Contents

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

Standards of Practice are directly from www.nachi.org

Standards of Practice are directly from www.nachi.org

Standards of Practice are directly from www.nachi.org

Standards of Practice are directly from www.nachi.org

Standards of Practice are directly from www.nachi.org

Go to InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

2. Limitations, Exceptions & Exclusions

2. Limitations, Exceptions & Exclusions

2. Limitations, Exceptions & Exclusions

2. Limitations, Exceptions & Exclusions

2. Limitations, Exceptions & Exclusions

2.1. Limitations:


I. An inspection is not technically exhaustive.

II. An inspection will not identify concealed or latent defects.

III. An inspection will not deal with aesthetic concerns, or what could be deemed matters of taste, cosmetic defects, etc.

IV. An inspection will not determine the suitability of the property for any use. 

V. An inspection does not determine the market value of the property or its marketability.

VI. An inspection does not determine the insurability of the property.

VII. An inspection does not determine the advisability or inadvisability of the purchase of the inspected property.

VIII. An inspection does not determine the life expectancy of the property or any components or systems therein.

IX. An inspection does not include items not permanently installed.

X. This Standards of Practice applies to properties with four or fewer residential units and their attached garages and carports.



2.2. Exclusions:


I. The inspector is not required to determine:

  • property boundary lines for encroachments.

  • the condition of any component or system that is not readily accessible.

  • the service life expectancy of any component or system.

  • the size, capacity, BTU, performance or efficiency of any component or system.

  • the cause or reason of any condition.

  • the cause for the need of correction, repair or replacement of any system or component.

  • future conditions.

  • compliance with codes or regulations.

  • the presence of evidence of rodents, birds, bats, animals, insects, or other pests.

  • the presence of mold, mildew or fungus.

  • the presence of airborne hazards, including radon.

  • the air quality.

  • the existence of environmental hazards, including lead paint, asbestos or toxic drywall.

  • the existence of electromagnetic fields.

  • any hazardous waste conditions.

  • any manufacturers' recalls or conformance with manufacturer installation, or any information included for consumer protection purposes.

  • acoustical properties.

  • correction, replacement or repair cost estimates.

  • estimates of the cost to operate any given system.



II. The inspector is not required to operate:


  • any system that is shutdown.

  • any system that does not function properly.

  • or evaluate low-voltage electrical systems, such as, but not limited to:

1. phone lines;

2. cable lines;

3. satellite dishes;

4. antennae;

5. lights; or

6. remote controls.

  • any system that does not turn on with the use of normal operating controls.

  • any shut-off valves or manual stop valves.

  • any electrical disconnect or over-current protection devices.

  • any alarm systems.

  • moisture meters, gas detectors or similar equipment.


III. The inspector is not required to:


  • move any personal items or other obstructions, such as, but not limited to: throw rugs, carpeting, wall coverings, furniture, ceiling tiles, window coverings, equipment, plants, ice, debris, snow, water, dirt, pets, or anything else that might restrict the visual inspection.

  • dismantle, open or uncover any system or component.

  • enter or access any area that may, in the inspector's opinion, be unsafe.

  • enter crawl spaces or other areas that may be unsafe or not readily accessible.

  • Inspect underground items, such as, but not limited to: lawn-irrigation systems, or underground storage tanks (or indications of their presence),
    whether abandoned or actively used.

  • do anything that may, in the inspector's opinion, be unsafe or dangerous to him/herself or others, or damage property, such as, but not limited to: walking on roof surfaces, climbing ladders, entering attic spaces, or negotiating with pets.

  • inspect decorative items.

  • inspect common elements or areas in multi-unit housing.

  • inspect intercoms, speaker systems or security systems.

  • offer guarantees or warranties.

  • offer or perform any engineering services.

  • offer or perform any trade or professional service other than a home inspection.

  • research the history of the property, or report on its potential for alteration, modification, extendibility or suitability for a specific or proposed use for occupancy.

  • determine the age of construction or installation of any system, structure or component of a building, or differentiate between original construction and subsequent additions, improvements, renovations or replacements.

  • determine the insurability of a property.

  • perform or offer Phase 1 or environmental audits.

  • inspect any system or component that is not included in these Standards.

3. Standards of Practice

3. Standards of Practice

3. Standards of Practice

3. Standards of Practice

3. Standards of Practice

3.2. Exterior

3.2. Exterior

3.2. Exterior

3.2. Exterior

3.2. Exterior

I. The inspector shall inspect:


  • the exterior wall-covering materials;


  • the eaves, soffits and fascia;

  • a representative number of windows;

  • all exterior doors;

  • flashing and trim;

  • adjacent walkways and driveways;

  • stairs, steps, stoops, stairways and ramps;

  • porches, patios, decks, balconies and carports;

  • railings, guards and handrails; and

  • vegetation, surface drainage, retaining walls and grading of the property, where they may adversely affect the structure due to moisture intrusion.


II. The inspector shall describe:

A. the type of exterior wall-covering materials. 

III. The inspector shall report as in need of correction:

A. any improper spacing between intermediate balusters, spindles and rails. 

IV. The inspector is not required to:


  • Inspect or operate screens, storm windows, shutters, awnings, fences, outbuildings, or exterior accent lighting.

  • Inspect items that are not visible or readily accessible from ground, including window and door flashing.

  • Inspect or geological, geotechnical, hydrological or soil conditions.

  • inspect recreational facilities or playground equipment.

  • inspect seawalls, break walls or docks.

  • inspect erosion-control or earth-stabilization measures.

  • inspect for safety-type glass.

  • inspect underground utilities.

  • inspect underground items.

  • inspect wells or springs.

  • inspect solar, wind or geothermal systems.

  • inspect swimming pools or spas.

  • inspect wastewater treatment systems, septic systems or cesspools.

  • inspect irrigation or sprinkler systems.

  • inspect drain fields or dry wells.

  • determine the integrity of multiple-pane window glazing or thermal window seals.

3.6. Plumbing

3.6. Plumbing

3.6. Plumbing

3.6. Plumbing

3.6. Plumbing

I. The inspector shall inspect:


  • the main water supply shut-off valve;

  • the main fuel supply shut-off valve;

  • the water heating equipment, including the energy source, venting connections, temperature/pressure-relief (TPR) valves, Watts 210 valves, and seismic bracing;

  • interior water supply, including all fixtures and faucets, by running the water;

  • all toilets for proper operation by flushing;

  • all sinks, tubs and showers for functional drainage;

  • the drain, waste and vent system; and

  • drainage sump pumps with accessible floats.


II. The inspector shall describe:

A. whether the water supply is public or private based on observed evidence; 

B. the location of the main water supply shut-off valve;

C. the location of the main fuel supply shut-off valve; 

D. the location of any observed fuel-storage system; and


E. the capacity of the water heating equipment, if labeled. 



III. The inspector shall report as in need of correction:


  • deficiencies in the water supply by viewing the functional flow in two fixtures operated simultaneously;

  • deficiencies in the installation of hot and cold water faucets;

  • active plumbing water leaks that were observed during the inspection; and

  • toilets that were damaged, had loose connections to the floor, were leaking, or had tank components that did not operate.


IV. The inspector is not required to:


  • Light or ignite pilot flames.

  • measure the capacity, temperature, age, life expectancy or adequacy of the water heater.

  • inspect the interior of flues or chimneys, combustion air systems, water softener or filtering systems, well pumps or tanks, safety or shut-off valves, floor drains, lawn sprinkler systems, or fire sprinkler systems.

  • determine the exact flow rate, volume, pressure, temperature or adequacy of the water supply.

  • determine the water quality, potability or reliability of the water supply or source.

  • open sealed plumbing access panels.

  • inspect clothes washing machines or their connections.


H. operate any valve.

I. test shower pans, tub and shower surrounds or enclosures for leakage or for functional overflow protection.

J. evaluate the compliance with conservation, energy or building standards, or the proper design or sizing of any water, waste or venting components, fixtures or piping.

K. determine the effectiveness of anti-siphon, back-flow prevention or drain-stop devices.

L. determine whether there are sufficient clean-outs for effective cleaning of drains.

M. evaluate fuel storage tanks or supply systems.

N. inspect wastewater treatment systems.

O. inspect water treatment systems or water filters.

P. inspect water storage tanks, pressure pumps, or bladder tanks.

Q. evaluate wait time to obtain hot water at fixtures, or perform testing of any kind to water heater elements.

R. evaluate or determine the adequacy of combustion air.

S. test, operate, open or close: safety controls, manual stop valves, temperature/pressure-relief valves, control valves, or check valves.

T. examine ancillary or auxiliary systems or components, such as, but not limited to, those related to solar water heating and hot water circulation.

U. determine the existence or condition of polybutylene, polyethylene, or similar plastic piping.

V. inspect or test for gas or fuel leaks, nor indications thereof.

3.7. Electrical

3.7. Electrical

3.7. Electrical

3.7. Electrical

3.7. Electrical

I. The inspector shall inspect:


  • the service drop;

  • the overhead service conductors and attachment point;

  • the service head, gooseneck and drip loops;

  • the service mast, service conduit and raceway;

  • the electric meter and base;

  • service-entrance conductors;

  • the main service disconnect;

  • panel-boards and over-current protection devices (circuit breakers and fuses);

  • service grounding and bonding;

  • a representative number of switches, lighting fixtures and receptacles, including receptacles observed and deemed to be arc-fault circuit interrupter (AFCI)-protected using the AFCI test button, where possible;

  • all ground-fault circuit interrupter receptacles and circuit breakers observed and deemed to be GFCIs using a GFCI tester, where possible; and

  • for the presence of smoke and carbon monoxide detectors.


II. The inspector shall describe:


A. the main service disconnect's amperage rating, if labeled; and 

B. the type of wiring observed.



III. The inspector shall report as in need of correction:


  • deficiencies in the integrity of the service-entrance conductors’ insulation, drip loop, and vertical clearances from grade and roofs;

  • any unused circuit-breaker panel opening that was not filled;

  • the presence of solid conductor aluminum branch-circuit wiring, if readily visible;

  • any tested receptacle in which power was not present, polarity was incorrect, the cover was not in place, the GFCI devices were not properly installed or did not operate properly, evidence of arcing or excessive heat, and where the receptacle was not grounded or was not secured to the wall; and

  • the absence of smoke and/or carbon monoxide detectors.



IV. The inspector is not required to:


  • Insert any tool, probe or device into the main panel-board, sub-panels, distribution panel-boards, or electrical fixtures.

  • operate electrical systems that are shut down.

  • remove panel board cabinet covers or dead fronts.

  • operate or re-set overcurrent protection devices or overload devices.

  • operate or test smoke or test smoke or carbon monoxide detectors alarms.

  • inspect, operate or test any security, fire or alarm systems or components, or other warning or signaling systems.

  • measure or determine the amperage or voltage of the main service equipment, if not visibly labeled.

  • inspect ancillary wiring or remote-control devices.

  • activate any electrical systems or branch circuits that are not energized.

  • inspect low-voltage systems, electrical de-icing tapes, swimming pool wiring, or any time-controlled devices.

  • verify the service ground.

  • inspect private or emergency electrical supply sources, including, but not limited to: generators, windmills, photovoltaic solar collectors, or battery or electrical storage facility.

  • inspect spark or lightning arrestors.

  • inspect or test de-icing equipment.

  • conduct voltage-drop calculations.

  • determine the accuracy of labeling.

  • inspect exterior lighting.

3.8. Fireplace

3.8. Fireplace

3.8. Fireplace

3.8. Fireplace

3.8. Fireplace

I. The inspector shall inspect:


  • readily accessible and visible portions of the fireplace and chimneys;


  • lintels above the fireplace openings;


  • damper doors by opening and closing them, if readily accessible and manually operable; and


  • clean-out doors and frames.

II. The inspector shall describe: 

A. the type of fireplace.


III. The inspector shall report as in need of correction:


  • evidence of joint separation, damage or deterioration of the hearth, hearth extension or chambers;

  • manually operated dampers that did not open and close;

  • the lack of a smoke detector in the same room as the fireplace;

  • the lack of a carbon monoxide detector in the same room as the fireplace; and

  • clean-outs not made of metal, pre-cast cement, or other non-combustible material.


IV. The inspector is not required to:


  • inspect the flue or vent system.

  • inspect the interior of chimneys or flues, fire doors or screens, seals or gaskets, or mantels.

  • determine the need for a chimney sweep.

  • operate gas fireplace inserts.

  • light pilot flames.

  • determine the appropriateness of any installation.

  • inspect automatic fuel-fed devices.

  • inspect combustion and/or make-up air devices.

  • inspect heat-distribution assists, whether gravity-controlled or fan-assisted.

  • ignite or extinguish fires.

  • determine the adequacy of draft or draft characteristics.

  • move fireplace inserts, stoves or firebox contents.

  • perform a smoke test.

  • dismantle or remove any component.

  • perform a National Fire Protection Association (NFPA)-style inspection.

  • perform a Phase I fireplace and chimney inspection.

3.10. Doors, Windows & Interior

3.10. Doors, Windows & Interior

3.10. Doors, Windows & Interior

3.10. Doors, Windows & Interior

3.10. Doors, Windows & Interior

I. The inspector shall inspect:


A. a representative number of doors and windows by opening and closing them; 

B. floors, walls and ceilings; 

C. stairs, steps, landings, stairways and ramps;

D. railings, guards and handrails; and

E. garage vehicle doors and the operation of garage vehicle door openers, using normal operating controls. 

II. The inspector shall describe:

A. a garage vehicle doors manually-operated or installed with a garage door opener. 



III. The inspector shall report as in need of correction:


  • improper spacing between intermediate balusters, spindles and rails for steps, stairways, guards and railings;

  • photo-electric safety sensors that did not operate properly; and

  • any window that was obviously fogged or displayed other evidence of broken seals.



IV. The inspector is not required to:


  • inspect paint, wallpaper, window treatments or finish treatments.

  • inspect floor coverings or carpeting.

  • inspect central vacuum systems.

  • inspect for safety glazing.

  • inspect security systems or components.

  • evaluate the fastening of islands, countertops, cabinets, sink tops or fixtures.

  • move furniture, stored items, or any coverings, such as carpets or rugs, in order to inspect the concealed floor structure.

  • move suspended-ceiling tiles.

  • inspect or move any household appliances.

  • inspect or operate equipment housed in the garage, except as otherwise noted.

  • verify or certify the proper operation of any pressure-activated auto-reverse or related safety feature of a garage door.

  • operate or evaluate any security bar release and opening mechanisms, whether interior or exterior, including their compliance with local, state or federal standards.

  • operate any system, appliance or component that requires the use of special keys, codes, combinations or devices.

  • operate or evaluate self-cleaning oven cycles, tilt guards/latches, or signal lights.

  • inspect microwave ovens or test leakage from microwave ovens.

  • operate or examine any sauna, steam-generating equipment, kiln, toaster, ice maker, coffee maker, can opener, bread warmer, blender, instant hot-water dispenser, or other small, ancillary appliances or devices.

  • inspect elevators.

  • inspect remote controls.

  • inspect appliances.

  • inspect items not permanently installed.

  • discover firewall compromises.


V. inspect pools, spas or fountains.

W. determine the adequacy of whirlpool or spa jets, water force, or bubble effects. 

X. determine the structural integrity or leakage of pools or spas.

4. Glossary of Terms

4. Glossary of Terms

4. Glossary of Terms

4. Glossary of Terms

4. Glossary of Terms

  • accessible: In the opinion of the inspector, can be approached or entered safely, without difficulty, fear or danger.

  • activate: To turn on, supply power, or enable systems, equipment or devices to become active by normal operating controls. Examples include turning on the gas or water supply valves to the fixtures and appliances, and activating electrical breakers or fuses.

  • adversely affect: To constitute, or potentially constitute, a negative or destructive impact.

  • alarm system: Warning devices, installed or freestanding, including, but not limited to: carbon monoxide detectors, flue gas and other spillage detectors, security equipment, ejector pumps, and smoke alarms.

  • appliance: A household device operated by the use of electricity or gas. Not included in this definition are components covered under central heating, central cooling or plumbing.


  • architectural service: Any practice involving the art and science of building design for construction of any structure or grouping of structures, and the use of space within and surrounding the structures or the design, design development, preparation of construction contract documents, and administration of the construction contract.

  • component: A permanently installed or attached fixture, element or part of a system.

  • condition: The visible and conspicuous state of being of an object.

  • correction: Something that is substituted or proposed for what is incorrect, deficient, unsafe, or a defect.

  • cosmetic defect: An irregularity or imperfection in something, which could be corrected, but is not required.

  • crawlspace: The area within the confines of the foundation and between the ground and the underside of the lowest floor's structural component.

  • decorative: Ornamental; not required for the operation of essential systems or components of a home.

  • describe: To report in writing a system or component by its type or other observed characteristics in order to distinguish it from other components used for the same purpose.

  • determine: To arrive at an opinion or conclusion pursuant to examination.

  • dismantle: To open, take apart or remove any component, device or piece that would not typically be opened, taken apart or removed by an ordinary occupant.


  • engineering service: Any professional service or creative work requiring engineering education, training and experience, and the application of special knowledge of the mathematical, physical and engineering sciences to such professional service or creative work as consultation, investigation, evaluation, planning, design and supervision of construction for the purpose of assuring compliance with the specifications and design, in conjunction with structures, buildings, machines, equipment, works and/or processes.


  • enter: To go into an area to observe visible components.

  • evaluate: To assess the systems, structures and/or components of a property.

  • evidence: That which tends to prove or disprove something; something that makes plain or clear; grounds for belief; proof.

  • examine: To visually look (see inspect).

  • foundation: The base upon which the structure or wall rests, usually masonry, concrete or stone, and generally partially underground.

  • function: The action for which an item, component or system is specially fitted or used, or for which an item, component or system exists; to be in action or perform a task.

  • functional: Performing, or able to perform, a function.

  • functional defect: A lack of or an abnormality in something that is necessary for normal and proper functioning and operation, and, therefore, requires further evaluation and correction.

  • general home inspection: See "home inspection."

  • home inspection: The process by which an inspector visually examines the readily accessible systems and components of a home and operates those systems and components utilizing this Standards of Practice as a guideline.

  • household appliances: Kitchen and laundry appliances, room air conditioners, and similar appliances.

  • identify: To notice and report.

  • indication: That which serves to point out, show, or make known the present existence of something under certain conditions.

  • inspect: To examine readily accessible systems and components safely, using normal operating controls, and accessing readily accessible areas, in accordance with this Standards of Practice.

  • inspected property: The readily accessible areas of the home, house, or building, and the components and systems included in the inspection.

  • inspection report: A written communication (possibly including images) of any material defects observed during the inspection.

  • inspector: One who performs a real estate inspection.

  • installed: Attached or connected such that the installed item requires a tool for removal.

  • material defect: A specific issue with a system or component of a residential property that may have a significant, adverse impact on the value of the property, or that poses an unreasonable risk to people. The fact that a system or component is near, at, or beyond the end of its normal, useful life is not, in itself, a material defect.


  • normal operating controls: Describes the method by which certain devices (such as thermostats) can be operated by ordinary occupants, as they require no specialized skill or knowledge.

  • observe: To visually notice.

  • operate: To cause systems to function or turn on with normal operating controls.

  • readily accessible: A system or component that, in the judgment of the inspector, is capable of being safely observed without the removal of obstacles, detachment or disengagement of connecting or securing devices, or other unsafe or difficult procedures to gain access.

  • recreational facilities: Spas, saunas, steam baths, swimming pools, tennis courts, playground equipment, and other exercise, entertainment and athletic facilities.

  • report (verb form): To express, communicate or provide information in writing; give a written account of. (See also inspection report.)

  • representative number: A number sufficient to serve as a typical or characteristic example of the item(s) inspected.

  • residential property: Four or fewer residential units.

  • residential unit: A home; a single unit providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.

  • safety glazing: Tempered glass, laminated glass, or rigid plastic.

  • shut down: Turned off, unplugged, inactive, not in service, not operational, etc.

  • structural component: A component that supports non-variable forces or weights (dead loads) and variable forces or weights (live loads).

  • system: An assembly of various components which function as a whole.

  • technically exhaustive: A comprehensive and detailed examination beyond the scope of a real estate home inspection that would involve or include, but would not be limited to: dismantling, specialized knowledge or training, special equipment, measurements, calculations, testing, research, analysis, or other means.

  • unsafe: In the inspector's opinion, a condition of an area, system, component or procedure that is judged to be a significant risk of injury during normal, day-to- day use. The risk may be due to damage, deterioration, improper installation, or a change in accepted residential construction standards.

  • verify: To confirm or substantiate.

InterNACHI® Standards of Practice

InterNACHI® Standards of Practice

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