In New York City, where sustainability targets continue to intersect with ambitious development goals, the Ultra-Low Energy Building (ULEB) program offers a unique pathway forward. This innovative zoning mechanism provides a 5% Floor Area Ratio (FAR) bonus for projects that surpass NYC Energy Conservation Code requirements by at least 15%, offering a rare opportunity for developers to build more — while using less.
What Defines an Ultra-Low Energy Building?
Outlined in NYC Zoning Resolution Chapter 2, Section 12-10, an Ultra-Low Energy Building must meet two core criteria:
Full electrification, consistent with Local Law 154 of 2021.
At least 15% better energy performance than code baseline using an approved NYC Energy Conservation Code modeling method.
Unlike previous standards, ULEB applies a comprehensive approach that includes both regulated and non-regulated end-uses — a crucial distinction when calculating energy savings. For residential buildings, tenant-installed lighting, cooking appliances, and elevators are factored in; for commercial office buildings, food service and elevator systems are included in the model.
The Business Case: Maximizing Value Through Energy Performance
The 5% FAR bonus can significantly increase developable area — a direct financial incentive that balances sustainability with business objectives. For developers, ULEB provides a clear mechanism to maximize project potential while contributing to New York City’s broader climate objectives under Local Law 97 and the 80x50 carbon reduction targets.
Supporting ULEB Projects from Concept to Approval
From early-stage modeling to DOB approvals, SOCOTEC helps clients navigate both the technical and procedural complexities of ULEB compliance. Our integrated expertise across energy modeling, building envelope consulting, commissioning, and code advisory allows clients to fully capitalize on available zoning incentives — while ensuring lasting performance outcomes.
Case Studies:
ULEB in Action
SOCOTEC’s Energy & Sustainability team has successfully supported multiple projects through the ULEB certification process, helping clients realize both energy savings and zoning benefits:
18-Story Multifamily Tower
Located in NYC, this residential tower includes 246 units. The project achieved 18.3% energy savings through a combination of enhanced wall assemblies, high-efficiency HVAC systems, and reduced lighting power densities throughout the building. The design team optimized building envelope details and implemented strategic HVAC selections to meet ULEB thresholds while maintaining cost-efficiency.
5-Story Residential Development
This smaller-scale multifamily project reached 17.6% energy savings, driven by a fully electrified system design featuring 19% improved opaque envelope performance, careful thermal bridge mitigation, and high-efficiency heat pump water heating with a COP of 3.7.
In both cases, SOCOTEC’s early involvement helped streamline the review process. With comprehensive submission packages prepared, both projects received DOB approvals within approximately one week — demonstrating how proper planning and technical coordination can significantly accelerate the ULEB approval timeline.
SOCOTEC’s Energy & Sustainability team has successfully supported multiple projects through the ULEB certification process, helping clients realize both energy savings and zoning benefits:
18-Story Multifamily Tower
Located in NYC, this residential tower includes 246 units. The project achieved 18.3% energy savings through a combination of enhanced wall assemblies, high-efficiency HVAC systems, and reduced lighting power densities throughout the building. The design team optimized building envelope details and implemented strategic HVAC selections to meet ULEB thresholds while maintaining cost-efficiency.
5-Story Residential Development
This smaller-scale multifamily project reached 17.6% energy savings, driven by a fully electrified system design featuring 19% improved opaque envelope performance, careful thermal bridge mitigation, and high-efficiency heat pump water heating with a COP of 3.7.
In both cases, SOCOTEC’s early involvement helped streamline the review process. With comprehensive submission packages prepared, both projects received DOB approvals within approximately one week — demonstrating how proper planning and technical coordination can significantly accelerate the ULEB approval timeline.
Key Technical Strategies for ULEB Compliance
SOCOTEC's cross-disciplinary team applies a strategic, integrated approach to guide clients through ULEB certification. Proven strategies include:
ULEB’s Role in NYC’s Climate Future
As New York City advances toward its aggressive carbon reduction mandates, ULEB offers a model for how zoning incentives can directly support sustainable, electrified building design. By aligning real estate development interests with climate objectives, the program enables high-performance buildings that are positioned for long-term success — both environmentally and financially.
Ultra Low Energy Building Solutions Overview
To explore how SOCOTEC can support your ULEB project, contact our Energy & Sustainability team today.
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