12.2 Site Planning Process: From Analysis to Concept

Site Planning Process: From Analysis to Concept

Quick Answer: The ALE tests site planning as a step-by-step method: synthesize site analysis into a concept, establish the buildable envelope using PD 1096 development controls (PSO, AMBF, FLAR, TGFA), diagram zoning, circulation, and parking, allocate open space, then iterate from a rough bubble diagram toward a resolved, dimensioned site development plan.

From Analysis to Concept: The Synthesis Step

Site analysis generates raw data: sun path, prevailing wind, topography, soil, drainage, adjacent land uses, vehicular access points, utility connections, easements, and views. Site planning is the discipline of converting that raw data into a workable design concept. The critical skill the ALE tests is synthesis: an examinee must look at a site analysis summary and identify the two or three findings that most constrain or unlock the design. For example, a site showing a steep slope toward the rear, a busy arterial road on the north frontage, and a floodway easement along the south boundary should immediately suggest a concept with vehicular access from the arterial, building mass held away from the floodway, and a stepped or terraced form responding to the slope. A site concept is normally expressed first as a simple diagram - bubbles and arrows - before any dimensioned decision is made.

Step 1: Establish the Buildable Envelope

Before diagramming anything, the architect must know how much of the lot can legally be built on. This is governed by PD 1096 development controls:

The area outside the AMBF footprint is the mandatory open space available for setbacks, parking, driveways, and landscaping. Fixing these numbers first prevents an examinee from sketching a footprint or floor count the zone classification does not actually allow.

Step 2: Functional and Zoning Diagrams

With the buildable envelope established, the next step is a functional (bubble) diagram that assigns rough zones to the site without committing to exact geometry: building footprint zone, vehicular entry/exit and parking zone, service/loading zone, pedestrian entry and forecourt zone, and open space/green zone. At this stage, relationships matter more than dimensions - the service and loading zone should bubble adjacent to the kitchen or stockroom side of the building and away from the main pedestrian entrance, while the parking zone should bubble near the vehicular access point identified in site analysis rather than forcing traffic to cross the site.

Step 3: Vehicular and Pedestrian Circulation

Circulation is resolved once the functional diagram fixes rough zones. Vehicular circulation should generally use a single, clearly marked entry/exit, or a one-way in/out pair, that aligns with the site analysis findings on street traffic direction and sight distance, and should be separated as much as possible from the primary pedestrian path so cars and pedestrians do not conflict at the main entrance. Pedestrian circulation should connect the public sidewalk to the building entrance along the shortest comfortable, shaded route - ideally through the semi-public forecourt or arcade discussed in the previous section rather than across a parking aisle.

Step 4: Parking Layout

Parking requirements are computed from Rule VII, Section 707, Item 4 (Table VII.4) of the Revised Implementing Rules and Regulations of PD 1096, which sets minimum parking slots by occupancy type and floor area. Two computational rules are commonly tested: a computed fractional requirement of 0.50 or above rounds up to one additional slot, and where an adequate public parking facility exists within 200 meters of the site, only 30% of the computed on-site parking requirement need actually be provided on the premises. Once the required slot count is known, parking is laid out with clear aisles and accessible slots nearest the accessible building entrance per BP 344, with paving, lighting, and drainage as required - always positioned so parking does not become the dominant visual element at the street frontage.

Step 5: Open Space and Green Space Allocation

The area remaining after subtracting the building footprint, parking, and circulation is allocated to usable and green open space. For an ALE design problem, open space should be purposeful, not leftover: a functional courtyard, garden, or outdoor gathering space tied to the building's use, rather than an unusable sliver against the property line. Where a project falls under subdivision rules (PD 957/BP 220), a minimum of 30% of gross area for projects of one hectare or more must be reserved as open space, with a density-based sliding scale of roughly 3.5% to 9% specifically for parks and playgrounds.

Step 6: Iterating from Rough Concept to Resolved Plan

Site planning is iterative, not linear. After the first bubble diagram and rough zoning are drawn, the architect tests the concept against the buildable envelope numbers (Step 1), refines circulation (Step 3), and re-checks that the building footprint, parking, and open space actually fit within the site boundaries and setbacks. Each iteration should resolve conflicts identified in the previous round - a parking layout blocking the pedestrian path, a footprint exceeding AMBF, an open space that ends up unusably narrow - until the diagram becomes a dimensioned, code-compliant site development plan ready for the next stage of architectural design. On the ALE's design problem-solving component, examinees are expected to show this progression, not present a single finished plan with no evidence of the underlying process.