9.3 BD+C Project Types and Scope
Key Takeaways
- LEED v4.1 BD+C covers 8 project types: New Construction (NC), Core & Shell (CS), Schools, Retail, Data Centers, Warehouses & Distribution Centers, Hospitality, and Healthcare.
- The LEED project boundary is the portion of the site submitted for certification; it must include all contiguous land associated with the building and is distinct from the legal site/property line.
- If a project occupies less than 40% of the building's gross floor area, BD+C does not apply — the project should pursue LEED ID+C (Interior Design and Construction) instead.
- If a project includes more than 40% of the building's gross floor area, the entire building must pursue BD+C certification, including spaces not in the project scope.
- Multiple-building projects may use Group Certification (one application, identical results) or Campus Certification (one shared application, individual results per building) when buildings sit on a single contiguous site with shared ownership.
The 8 BD+C Rating Systems
LEED v4.1 Building Design and Construction is a family of related rating systems. They share most credits but adjust thresholds, applicability, and a handful of category-specific credits to fit each building type.
| Rating System | Use For | Notable Variations |
|---|---|---|
| NC — New Construction & Major Renovations | Office, multifamily ≥4 stories, and any building type without its own rating system | The default BD+C path |
| CS — Core and Shell | Speculative or developer-led buildings where the owner controls structure and base building only | Pre-certification available; modified IEQ credits for unfinished tenant space |
| Schools | K-12 and higher-education classroom buildings | Acoustic performance prerequisite; mold prevention; master site planning |
| Retail | Stores, restaurants, banks with high customer traffic | Process-energy credits; commercial kitchen ventilation |
| Data Centers | Buildings ≥60% of gross floor area dedicated to data processing | PUE-based energy benchmarking; redundancy-aware energy modeling |
| Warehouses & Distribution Centers | Storage and shipping facilities with limited occupant density | Reduced occupant-comfort thresholds; loading-dock IAQ |
| Hospitality | Hotels, motels, resorts | Guest-room water and energy submetering; in-suite controls |
| Healthcare | Inpatient hospitals; some outpatient with 24/7 operation | Acoustic performance; medical-equipment energy; chemical safety |
If two rating systems could apply to a building (e.g., a mixed-use building with retail at grade and offices above), the team must use the 40/40/20 rule:
- >40% of gross floor area in one use → that rating system is required.
- <40% of gross floor area in one use and >40% in another → choose the rating system that applies to the majority use.
- 20–40% in a secondary use → the team may choose either applicable rating system.
The LEED Project Boundary
The LEED project boundary is the portion of the project site submitted for certification. It is distinct from the legal property line and from the building footprint.
Key rules:
- The boundary must include all contiguous land associated with the building and its operations (parking, hardscape, landscape, stormwater features).
- The boundary cannot exclude land to game a credit (for example, drawing the boundary tight around a building to avoid counting a parking lot in the heat-island calculation).
- For Core & Shell projects, the boundary must include any tenant space that is part of the developer's certification scope.
- The boundary must be reasonably and consistently applied across all credits — the same boundary is used for site, water, transportation, and density calculations.
MPR Reminder: Minimum Site Area
The Minimum Program Requirements (MPRs) require:
- The project must be in a permanent location on existing land.
- The project must use reasonable LEED boundaries.
- The project must comply with applicable laws (environmental, zoning, etc.).
A project that violates an MPR cannot certify regardless of point total.
Substantial Completion and Occupancy
A BD+C project must be designed and constructed for occupancy. The exam expects you to know:
- Substantial completion is when the building is sufficiently complete that the owner can use it for its intended purpose.
- BD+C reviews begin at substantial completion (construction review) — though optional design review can happen earlier.
- A building that has been occupied for more than 60 months (5 years) typically must pursue O+M (Operations and Maintenance), not BD+C.
Phased Projects
Some large developments are built in multiple phases over months or years. LEED handles this through:
- One application per phase — each phase certifies separately if it has a distinct LEED boundary and substantial completion date.
- Master Site / Group Certification — a single application covers all phases when boundaries and ownership are shared.
Multiple-Building Projects
When multiple buildings are pursued together, two paths exist:
| Path | When To Use | Outcome |
|---|---|---|
| Group Certification | Buildings are nearly identical (e.g., a developer building 5 identical hotels) | One certification application; all buildings receive the same certification level |
| Campus Certification | Buildings share a site and shared systems (e.g., a corporate campus) but differ | One shared application for site/shared credits; each building certifies individually |
Both paths require:
- A single contiguous site under shared ownership or control
- Buildings that share the same LEED project boundary for site-level credits
- All buildings pursuing the same rating system (e.g., all NC)
Pre-Certification (Core & Shell Only)
Pre-certification is a unique feature of the Core and Shell rating system. Developers can apply for pre-certification during design to market a building's expected LEED level to prospective tenants before construction is complete.
- Pre-certification is marketing-only — it is not the same as final certification.
- It is available only for CS projects.
- The final CS certification is awarded after construction review.
A developer is constructing a 12-story mixed-use building. The ground floor (8% of gross floor area) is retail, floors 2–4 are a hotel (32% of GFA), and floors 5–12 are speculative office space leased to multiple future tenants (60% of GFA). Which LEED BD+C rating system applies?
A corporate client is building 5 identical fulfillment centers across the country, all under common ownership, using the same design and contractor. The owner wants a single LEED submission and is willing to accept the same certification level for every building. Which LEED certification approach is MOST appropriate?