Site and Environmental Analysis

Site and Environmental Analysis on the ExAC: the 3 sub-categories you need to know

Examitect's ExAC study plan divides Site and Environmental Analysis into three sub-categories. All three appear on the exam in multiple-choice, scenario-based, and multi-select formats. They collectively form one of the six topics in Section 1 and draw heavily from CHING Chapter 1.

What site and environmental analysis is, and what it produces

Site and environmental analysis is the process of studying a parcel of land to understand the forces that will shape a building design placed on it. You document physical conditions, regulatory constraints, climatic characteristics, and contextual relationships before any schematic design work begins. The product is a site analysis package: a set of drawings, reports, and written notes that the design team references throughout the project.

Under CHOP Chapter 6.1, site evaluation and selection is classified as a pre-design service, separate from basic services. When a client has already acquired a single site, site analysis of that site is also an additional pre-design service. If site analysis is deferred and undertaken during schematic design instead, the architect adjusts the schematic design fee accordingly. This service-classification detail appears on the ExAC in scenario questions that ask you to identify what phase the work belongs to and who pays for it.

2.1 Understand the principles related to the siting of a project

What sub-category 2.1 tests. Sub-category 2.1 of Examitect's ExAC study plan, taken from the CACB blueprint, is "Understand the principles related to the siting of a project." The primary references are CHING 7th ed. pages 1.02-1.13, 1.29-1.32, 1.42-1.44, and CHOP Chapter 6.1. The supplementary references are Architectural Graphic Standards (12th ed.), Flood Resilient Design (CSA W204-19), and Heating, Cooling, Lighting (4th ed., Chapters 5 and 11).

Questions in this sub-category test whether you understand the principles before you apply them. Typical formats: multiple choice on zoning concepts, multi-select on which site forces influence a design decision, and scenario questions on what an architect should investigate first on a new project.

The six layers of site reading

CHING 1.02 notes that buildings are conceived to house human activities "in natural and built environments that constrain as well as offer opportunities for development." Thorough site reading requires working through six layers in order:

1. Physical: topography (contour lines, slope direction), soils (bearing capacity, drainage), drainage patterns, and existing vegetation.
2. Climatic: sun path and solar altitude by season, prevailing wind direction and velocity, precipitation patterns (rainfall, snowfall), and NECB climate zone.
3. Regulatory: zoning category, permitted uses, setbacks from all property lines, maximum height, Floor Area Ratio (FAR) or lot coverage, easements, rights-of-way, and overlay zones (heritage, flood, hazard).
4. Contextual: neighbouring buildings and their massing, heritage resources, view corridors, urban design guidelines, noise sources, and community character.
5. Environmental: flood hazard area, seismic zone, potential contamination (requiring Phase 1 Environmental Site Assessment), and wildfire interface zone.
6. Access: proximity to transit, vehicular access points, service vehicle routes, and emergency vehicle turning radii.

Regulatory principles: zoning

CHING 1.30-1.31 covers zoning ordinances in detail. Zoning manages growth, regulates land use patterns, controls building density, and protects environmentally sensitive areas. For any building site, zoning regulates:

• Permitted use: the types of activities allowed (residential, commercial, industrial, mixed-use).
• Setbacks: minimum distances from property lines, typically from front, side, and rear. Exceptions may be made for architectural projections (roof overhangs, cornices, bay windows, balconies) and accessory structures (low-level decks, fences).
• Height limit: usually measured from average grade to the top of the parapet or roof ridge. Sloping roofs, chimneys, mechanical penthouses, and stair enclosures often have specific exemptions.
• Floor Area Ratio (FAR): the ratio of total gross floor area to lot area. FAR 2.0 on a 1,000 m2 lot permits 2,000 m2 of gross floor area distributed across any number of storeys.
• Lot coverage: the percentage of the lot that can be covered by building footprints and impermeable surfaces.
• Planned Unit Development (PUD): a flexible zoning mechanism that allows a mix of uses or varied setbacks in exchange for community amenities or open space dedication.

Solar siting principles

CHING 1.20-1.21 establishes the core solar principles tested in ExAC questions. The sun's path changes by season and latitude. At Canadian latitudes (roughly 43 to 60 degrees north), the sun rises northeast and sets northwest in summer, rises southeast and sets southwest in winter, and is always to the south at midday. Key implications for siting:

• Elongating the building along the east-west axis maximizes the south-facing facade, which receives the most solar radiation in winter when it's needed and can be shaded efficiently in summer by horizontal overhangs.
• East and west facades are difficult to shade because the sun is at a low angle in the morning and afternoon, making horizontal overhangs ineffective. Vertical fins or recessed windows work better on east and west exposures.
• In cool climates, minimizing north-facing glazing reduces heat loss without loss of daylight gain.
• Southern slopes receive more solar radiation and create a warmer microclimate than north-facing slopes at the same elevation.

Sound and views

CHING 1.29 establishes that sound energy from exterior sources (vehicular traffic, aircraft, machinery) disperses as it travels outward, diminishing with distance. The first strategy for noise reduction is always distance: place the building as far from the noise source as possible. When the site dimensions make this impossible, use:

• Earth berming or mounding between the building and the noise source.
• Solid fences, walls, or dense plantings as acoustic barriers.
• Building orientation so quiet uses (bedrooms, libraries) face away from the noise source.
• Service uses (parking structures, mechanical rooms) as a buffer between the building and the noise source.

2.2 Apply the principles of site design

What sub-category 2.2 tests. Sub-category 2.2 of Examitect's ExAC study plan, taken from the CACB blueprint, is "Apply the principles of site design." The primary references are CHING 7th ed. pages 1.16-1.19, 1.22-1.28, 1.32-1.40, 1.42, and CHOP Chapter 6.2. Supplementary references are the same as 2.1: Architectural Graphic Standards, Flood Resilient Design, and Heating, Cooling, Lighting Chapters 5 and 11.

Questions in 2.2 are applied: given a site condition, what do you do? Typical formats include scenario questions on grading decisions, multiple-choice on passive solar systems, calculation questions on parking counts or turning radii, and multi-select on retaining wall selection criteria.

Grading and topography

CHING 1.16-1.17 covers topography as the configuration of surface features of a plot of land. Contour lines are imaginary lines joining points of equal elevation. They are always continuous and never cross. A building design responds to topography through cut-and-fill operations: cutting removes material from high points; filling adds material to low points. Key design principles:

• Minimize the total volume of cut and fill to reduce cost and the risk of settlement on filled areas.
• Balance cut and fill on-site where possible, avoiding material haul-off.
• Maintain positive drainage away from all building foundations (minimum 2% slope for the first 3 m from the building).
• Avoid placing fill over existing drainage swales without providing alternative drainage paths.

Passive solar design

CHING 1.22-1.23 distinguishes three passive solar system types. The choice of system depends on climate, building type, and glazing area available.

Solar shading devices

CHING 1.24 classifies shading devices by orientation. Exterior devices intercept solar radiation before it reaches the glass and are more effective than interior blinds or curtains.

• Horizontal overhangs: most effective on south-facing facades. At 49 degrees north latitude, a summer sun altitude of roughly 64 degrees and a winter altitude of roughly 17 degrees allow an overhang to shade the window in summer while permitting full winter sun penetration.
• Vertical fins: most effective on east and west facades where the sun is at a low angle in the morning and afternoon.
• Egg-crate (combined): horizontal and vertical elements combined; effective for southeast and southwest facades.
• Light shelves: horizontal elements positioned at or above eye level that reflect diffuse daylight deep into the space while shading the lower portion of the window from direct sun.

Stormwater and site drainage

CHING 1.26-1.27 establishes that developing a site increases impermeable surface area and therefore increases stormwater runoff volume and velocity. Limiting disruption of the natural water hydrology is always preferable and is often required by code. Site drainage strategies:

• Positive surface grading: slope site surfaces toward swales, catch basins, or the street at 1-2% minimum.
• Subsurface drainage: perforated pipes in gravel trenches collect groundwater and convey it to a suitable outlet.
• Surface drainage: open swales, catch basins, and curbs intercept and convey surface runoff.
• Pervious paving: allows stormwater to infiltrate directly through the paving surface, recharging groundwater and reducing peak runoff.
• Vegetated roofs: retain a portion of rainfall in growth medium, reducing peak runoff and providing thermal insulation.
• Retention and detention ponds: store stormwater temporarily (detention) or permanently (retention) to reduce peak flows downstream.

Wind design strategies

CHING 1.28 covers wind direction and velocity as major site considerations in all climates. In cold climates, prevailing winter winds cause heat loss and discomfort. In warm climates, summer breezes provide natural ventilation. Design strategies:

• Orient the long axis of the building perpendicular to prevailing summer breezes to maximize cross-ventilation opportunity through operable windows on windward and leeward facades.
• Plant windbreaks (rows of dense conifers) on the north and northwest sides of a building to reduce winter heat loss.
• Use landforms, berms, or adjacent buildings as winter wind shields when planning building placement.
• Place courtyards or outdoor amenity spaces on the leeward side of the building to create sheltered outdoor areas.

Site access and circulation

CHING 1.32-1.35 covers site access as a key aspect of site planning. Key dimensions you need to recognize on the ExAC:

Retaining walls and slope protection

When a grade change exceeds the soil's natural angle of repose, a retaining wall is needed. CHING 1.36-1.39 distinguishes three main types:

• Gravity wall: resists overturning by its own mass. Used for walls up to 3,048 mm (10') high. Mass alone provides stability.
• T-type cantilevered reinforced concrete wall: used for walls 3,048 to 6,095 mm (10' to 20') high. The base slab uses the weight of soil over the heel to resist overturning.
• Timber retaining wall: relatively low heights only. Pressure-treated timbers laid with overlapping joints, spiked together, and tied with galvanized steel rods at 1,220 mm (4') centres.

All retaining walls must provide adequate drainage behind the wall to prevent hydrostatic pressure build-up. Weep holes at the base or perforated drainage pipe at the footing are typical.

2.3 Analyze data relevant to the site for a project

What sub-category 2.3 tests. Sub-category 2.3 of Examitect's ExAC study plan, taken from the CACB blueprint, is "Analyze data relevant to the site for a project." The primary references are CHING 7th ed. pages 1.13-1.20, 1.26-1.29, 1.42-1.44, and CHOP Chapter 6.1. Supplementary references are Architectural Graphic Standards, Flood Resilient Design, and Heating, Cooling, Lighting Chapters 5 and 11.

Questions in 2.3 present data (soil classification tables, contour maps, solar altitude figures, geotechnical summaries) and ask you to interpret them correctly. Typical formats: scenario-based questions with a partial site analysis package, table-reading questions from soil classification or sun angle data, and ordering questions on the site analysis process.

Soil analysis and classification

CHING 1.14-1.15 introduces the Unified Soil Classification System (USCS), which the ExAC tests through table-reading questions. You need to recognize the symbol, typical bearing capacity, frost susceptibility, and drainage characteristics for each major soil group.

Poor-bearing-capacity soils (ML, CH) may require deep foundations, wider footings, or a mat slab. High frost-susceptibility soils require foundations below the frost depth. Poor drainage soils require active drainage systems at the foundation level.

The site analysis process

CHING 1.13 describes the site analysis process as studying the contextual forces that influence building siting and spatial organization. The process begins with physical data gathering:

1. Draw the area and shape of the site from the legal survey, defining all boundary lines.
2. Indicate required setbacks, existing easements, and rights-of-way on the base plan.
3. Estimate the area and volume needed for the building program, site amenities, and future expansion.
4. Analyze ground conditions: soil bearing capacity, drainage direction, presence of rock or fill, groundwater depth.
5. Determine solar orientation: record sun angles for summer and winter solstices and equinoxes at the site's latitude.
6. Document prevailing wind: direction and velocity for summer and winter seasons.
7. Identify flood and seismic hazard areas, if applicable.
8. Note existing vegetation: species, canopy spread, root zone, and trees protected by by-law.
9. Record views to and from the site: which are assets (to be framed), which are liabilities (to be screened).
10. Identify contextual factors: heritage resources, noise sources, neighbouring buildings, service access points.

Under CHOP 6.1, the architect may also coordinate: geotechnical and soils reports, Phase 1 Environmental Site Assessments (ESA) for potential contamination, historic and archaeological surveys, and existing-facilities surveys for accessibility.

Reading the site plan

CHING 1.42-1.44 specifies what a complete site plan must include. These items appear directly on ExAC questions that ask you to identify a missing element or confirm a requirement. A completed site plan includes:

1. Name and address of the property owner.
2. Address of the property (if different from the owner's address).
3. Legal description of the property.
4. Source and date of the land survey.
5. Description of site boundaries: dimensions of property lines, their bearings, and total area.
6. Location and dimensions of all existing and proposed structures.
7. Required setback lines and existing easements or rights-of-way.
8. Existing and proposed grades shown by contour lines or spot elevations.
9. Site access, driveways, and parking areas.
10. Proposed landscaping and grading.
11. Utility connections (water, sewer, gas, electrical).
12. North arrow, graphic scale, and revision history.

A legal description (CHING 1.44) uses either a metes-and-bounds survey (courses and lengths of each boundary, starting and ending at a known point) or a rectangular survey system (township, range, section references). The legal description is a mandatory component of the site plan and most permit applications.

How each reference fits the site analysis sub-categories

Each reference cited in Examitect's ExAC study plan contributes a distinct perspective to this topic. Understanding what each one provides helps you know where to look when a question targets a specific type of knowledge.

Key site and environmental analysis terms (glossary)

Floor Area Ratio (FAR)

The ratio of total building gross floor area to the area of the lot. FAR 2.0 on a 1,000 m2 lot permits 2,000 m2 of gross floor area.

Setback

The minimum required distance between a building and a property line, road allowance, or other regulated boundary. Front, side, and rear setbacks may differ within the same zone.

Easement

A legal right held by a person or entity (utility company, neighbouring owner, municipality) to use a portion of another's land for a specified purpose, such as a utility corridor or drainage swale. The building cannot encroach on an easement area.

Right-of-way

A strip of land reserved for a road, sidewalk, utility line, or similar public use. Buildings and permanent structures cannot be placed within a right-of-way.

Contour line

An imaginary line on a topographic map connecting all points at the same elevation above a datum. Contour lines are always continuous and never cross.

Solar altitude

The angle of the sun above the horizon at a given time and location. At 49 degrees north latitude, noon solar altitude is roughly 17 degrees at winter solstice and 64 degrees at summer solstice.

Solar azimuth

The compass bearing of the sun from north. At Canadian latitudes the sun is always to the south at midday; it rises northeast and sets northwest in summer, rises southeast and sets southwest in winter.

Passive solar design

A design approach that uses the building's orientation, glazing, and thermal mass to capture and store solar heat without mechanical systems. Three system types: direct gain, indirect gain (Trombe wall), and isolated gain.

Trombe wall

A masonry or concrete wall 305 mm (12") thick placed immediately behind south-facing glazing. It absorbs solar heat during the day and radiates it to the interior over 8 to 10 hours.

Unified Soil Classification System (USCS)

A system of classifying soils by particle size, gradation, and plasticity using two-letter symbols (GW, GP, SW, ML, CH, etc.). Used in geotechnical reports to communicate soil type and engineering properties.

Bearing capacity

The maximum unit load a soil can support without failure or excessive settlement. Well-graded gravels (GW) carry up to 479 kPa; high-plasticity clays (CH) may carry only 48 kPa or less.

Metes and bounds

A method of legally describing a parcel of land by the course and distance of each boundary line, beginning and ending at a named reference point.

Phase 1 Environmental Site Assessment (ESA)

A records review and site reconnaissance to identify actual or potential contamination from past land use. Required before acquiring land or commencing construction on a potentially contaminated site.

CPTED

Crime Prevention Through Environmental Design. Site planning principles that use natural surveillance, access control, and territorial reinforcement to reduce the opportunity for crime without adding barriers or security hardware.

Wind rose

A graphic showing the frequency and direction of prevailing winds at a given location for a given period. Used to determine prevailing summer and winter wind directions for ventilation and windbreak design.

Planned Unit Development (PUD)

A flexible zoning mechanism that allows a mix of uses, varied setbacks, or higher density in exchange for community amenities, shared open space, or other public benefits.

Pervious paving

A paving surface with sufficient void space to allow stormwater to infiltrate directly into the underlying soil, reducing surface runoff and recharging groundwater. Examples include interlocking concrete pavers with open joints, porous asphalt, and porous concrete.

Frost depth

The maximum depth to which the ground freezes in winter at a given location. Building footings must be placed below frost depth to prevent frost heave. Ranges from about 400 mm in coastal BC to over 2,000 mm in northern Canada.

Retaining wall

A wall designed to hold back a mass of earth when a change in grade exceeds the soil's angle of repose. Types include gravity walls, cantilevered concrete walls, and timber walls, each suited to different heights and soil conditions.

Resilient design

The intentional design of buildings and sites to resist and recover from natural and human-caused disasters, including floods, wildfires, earthquakes, and extreme weather events associated with climate change.

How site analysis questions are asked on the ExAC

Site and environmental analysis questions appear in several formats across sub-categories 2.1, 2.2, and 2.3. Recognizing the format tells you what kind of reasoning the question is asking for.

Common ExAC traps in site analysis questions

These traps appear repeatedly across sub-categories 2.1, 2.2, and 2.3. Knowing them in advance saves you from predictable mistakes under time pressure.

1. Treating site analysis as a design step. The most frequent trap is choosing an answer that proposes a design solution before the site has been analyzed. "Draw a south-facing building" is wrong if the question asks what to do first on a new project. The correct answer almost always involves gathering data or commissioning a report.
2. Confusing FAR and lot coverage. FAR controls the total gross floor area relative to lot size; lot coverage controls the footprint percentage. A building can have high FAR with a small footprint by going taller, or high lot coverage with low FAR by spreading out one storey. Many ExAC questions exploit this distinction.
3. Applying the wrong shading device to the wrong orientation. Horizontal overhangs work on south facades. Vertical fins work on east and west facades. Candidates who memorize "use overhangs for shading" without noting the orientation will choose wrong on east-west facade questions.
4. Misreading soil frost susceptibility. GW and SW soils have no frost risk and excellent drainage. ML and CH soils have high frost risk and poor drainage. ExAC questions sometimes describe a site with ML soils and ask what additional investigation or design response is required: the answer involves frost-depth foundations and active drainage, not just deeper footings.
5. Confusing pre-design services with basic services. Under CHOP 6.1, site evaluation and selection is an additional service, not a basic service. Candidates who assume it is included in the basic fee will choose wrong on service-scope and fee-structure questions.
6. Misidentifying the metes-and-bounds purpose. A metes-and-bounds survey defines the legal boundary of a parcel of land, not the topography or soil conditions. Questions that ask about the purpose of a legal survey are answered by CHING 1.44, not the geotechnical report.

Tips for Intern Architects studying site and environmental analysis

• Read CHING Chapter 1 in one sitting. The chapter runs from pages 1.02 to 1.44 in the book and covers every concept tested across all three sub-categories. Reading it in one session lets you see how the topics connect rather than treating them as isolated facts.
• Memorize the USCS soil table. The bearing capacity, frost susceptibility, and drainage columns from CHING 1.14 appear directly in ExAC questions. Make a small flash card for GW, GP, SW, SP, ML, and CH and review it until the values are automatic.
• Draw sun path diagrams for your city. Sketch the summer and winter sun paths for your home city at its approximate latitude. Label the altitude at noon for each solstice. This exercise locks in the solar geometry concepts that many candidates know in theory but miscalculate under time pressure.
• Practice FAR calculations. Given a lot size, FAR, and height limit, calculate the maximum buildable area and check it against the lot coverage limit. Do five to ten of these until it feels mechanical. They appear as calculation questions with tight time constraints.
• Know the retaining wall height thresholds. CHING gives clear limits: gravity walls to 3,048 mm (10'); cantilevered to 6,095 mm (20'). ExAC questions give you a height and ask which type is appropriate. These thresholds are exact and testable.
• Study CHOP 6.1 for the pre-design service scope. The service classification questions (basic vs. additional, pre-design vs. schematic design) come from CHOP 6.1, not CHING. Know that site evaluation and selection is always an additional service, and understand the reasoning: the scope varies so widely by project that it cannot be included in a standard basic service fee.
• Connect site analysis to other Section 1 topics. Sustainable Design Literacy (sub-categories 13.1-13.3) and Schematic Design both draw on site analysis findings. If you understand how sun, wind, and soil data feed into passive solar and massing decisions, you answer questions in adjacent topics more accurately too.
• Use Heating, Cooling, Lighting for the numbers CHING leaves out. CHING states principles; Heating, Cooling, Lighting (Chapters 5 and 11) gives you the thresholds, ratios, and calculation methods. For questions that ask you to justify a design decision with a number, that book is the source.

How to study site and environmental analysis in 10 to 14 hours

1. Hours 1 to 3: Read CHING Chapter 1 pages 1.02 to 1.44 in full, taking brief notes on each major topic (building in context, sustainability, site analysis, soils, topography, plant materials, solar, drainage, wind, sound, zoning, circulation, retaining walls, paving, site plan). Focus on understanding the sequence, not memorizing every number on first pass.
2. Hours 4 to 5: Review CHOP Chapter 6.1 (Predesign), focusing on the definitions of pre-design services, the site evaluation and selection process, feasibility study scope, and the classification of site analysis as an additional rather than basic service.
3. Hours 6 to 7: Go back through CHING Chapter 1 and extract the key numbers into a single reference sheet: solar altitudes, retaining wall height limits, turning radii, parking stall dimensions, slope percentages, bearing capacity values, and Trombe wall thickness. Review this sheet until you can recall the values without looking.
4. Hours 8 to 9: Read Heating, Cooling, Lighting Chapters 5 and 11 for the passive solar and daylighting content that CHING covers only at a principles level. Note the quantitative thresholds for thermal mass area ratios, window-to-wall ratios, and shading geometry.
5. Hours 10 to 11: Work through Examitect practice questions for sub-categories 2.1, 2.2, and 2.3. For each question you get wrong, identify which concept it tested and re-read the corresponding CHING or CHOP section before moving on.
6. Hours 12 to 14: Review the site plan requirements from CHING 1.42-1.44, the USCS soil table, and the zoning concepts from CHING 1.30-1.31. Do a second pass of practice questions with a focus on the question format patterns and traps identified in these study notes.