Trend watch: Net-zero buildings & retrofits in 2026 — signals, winners, and red flags

Building operations and construction account for 37% of global energy-related CO2 emissions, and the retrofit rate for existing commercial buildings in the US remains below 2% annually, according to the International Energy Agency's 2025 Global Status Report for Buildings and Construction. Yet the economics of net-zero buildings are shifting faster than most market participants realize. This trend watch identifies the signals reshaping the net-zero buildings and retrofits landscape in 2026, the companies and strategies winning, and the red flags that could stall progress.

Why It Matters

Buildings represent the single largest source of emissions that existing technology can cost-effectively address. The challenge is not technical feasibility but deployment velocity. Approximately 80% of the buildings that will exist in 2050 have already been built, making deep energy retrofits the primary lever for decarbonizing the built environment. New construction standards alone cannot solve the problem.

Three forces are converging in 2026 to accelerate the transition. First, building performance standards (BPS) are expanding beyond early adopters. New York City's Local Law 97 began imposing penalties on buildings exceeding emissions limits in 2024, and Washington DC, Boston, Denver, and St. Louis have enacted similar regulations. Over 40 US cities and states now have BPS legislation in place or under development, creating compliance pressure across commercial real estate portfolios.

Second, the Inflation Reduction Act's commercial building energy efficiency tax deduction (Section 179D) was expanded and made permanent, providing up to $5.00 per square foot for qualifying deep retrofits. Combined with state-level incentives and utility rebates, the effective subsidy stack can cover 30-45% of retrofit project costs, fundamentally changing return calculations.

Third, institutional investors and lenders are integrating climate risk into real estate valuations. The "brown discount" on energy-inefficient buildings has moved from theoretical risk to measurable market reality. CBRE's 2025 research found that ENERGY STAR-certified office buildings commanded a 7.1% rental premium and 12.3% higher asset values compared to non-certified peers in the same submarkets.

Key Concepts

Net-zero operational carbon describes a building that produces zero net carbon emissions from its annual energy consumption, achieved through a combination of deep energy efficiency measures, on-site renewable energy generation, and verified renewable energy procurement for any remaining grid electricity.

Deep energy retrofits go beyond equipment upgrades to fundamentally redesign building envelope performance, HVAC systems, lighting, and controls. These projects typically target 50-80% reductions in energy use intensity (EUI) and require integrated design approaches rather than component-by-component replacement.

Building performance standards (BPS) set mandatory emissions or energy intensity limits for existing buildings, typically applying to commercial properties above a square footage threshold. Buildings must demonstrate compliance through measured performance data, with penalties for non-compliance that escalate over time.

Embodied carbon represents the emissions associated with manufacturing, transporting, and installing building materials and systems. As operational carbon decreases through efficiency and electrification, embodied carbon becomes a proportionally larger share of a building's lifecycle emissions, making material selection critical for whole-life carbon performance.

What's Working

Empire State Realty Trust's portfolio-wide decarbonization program demonstrates that large-scale commercial retrofit economics work at current incentive levels. The company has reduced portfolio emissions intensity by 54% from a 2010 baseline across its 10.1 million square feet of office and retail space in the New York metropolitan area. The flagship Empire State Building achieved a 44% reduction in energy consumption through a comprehensive retrofit that included window remanufacturing, chiller plant optimization, and tenant energy management systems. The company reports that efficiency investments generate consistent annual savings of $4.4 million, with simple payback periods averaging 3.1 years across the portfolio.

Passive House retrofits in the multifamily sector are proving viable at scale in Northern European and US markets. Retrofit Chicago's partnership with Elevate Energy has completed Passive House-level deep retrofits on over 2,800 affordable housing units since 2021, achieving 65-75% reductions in heating energy demand. Per-unit retrofit costs have declined from $45,000 to approximately $28,000 as contractors develop standardized approaches and prefabricated insulation panel systems. Tenants report average utility bill reductions of $1,200 per year, making these projects simultaneously climate and equity interventions.

Heat pump adoption in commercial buildings has reached an inflection point. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) reports that heat pump installations in US commercial buildings increased 62% between 2023 and 2025. Variable refrigerant flow (VRF) systems now account for 38% of new commercial HVAC installations in the Northeast and Pacific Northwest, displacing gas-fired heating in climate zones where electrification was previously considered uneconomic. Manufacturers including Mitsubishi Electric, Daikin, and Johnson Controls have introduced cold-climate commercial heat pump systems rated for operation at -15°F, eliminating the performance gap that historically limited adoption in colder markets.

What's Not Working

Small and mid-sized commercial buildings remain largely unreached. BPS regulations typically apply to buildings above 25,000-50,000 square feet, leaving the majority of commercial building stock unregulated. Buildings between 5,000 and 25,000 square feet represent roughly 45% of total US commercial floor space but lack access to the project finance structures, energy management expertise, and contractor networks available to institutional-grade properties. Without targeted programs for this segment, net-zero retrofit activity will remain concentrated in Class A office towers while the bulk of emissions persists.

Utility grid constraints are delaying electrification projects. Building owners pursuing full electrification frequently encounter 12-24 month delays for electrical service upgrades, particularly in dense urban markets where transformer capacity and distribution infrastructure cannot accommodate increased loads. In New York City, consolidated Edison's interconnection queue for commercial electrical upgrades exceeded 18 months in 2025. These grid bottlenecks create a structural barrier: building owners cannot comply with BPS deadlines if the utility cannot deliver the electrical capacity needed for heat pump conversions.

Split incentive problems persist in leased commercial space. Building owners bear retrofit capital costs while tenants capture energy savings through lower utility bills. Green lease structures that share savings between landlords and tenants exist but remain the exception rather than the norm. The Building Owners and Managers Association (BOMA) estimates that fewer than 15% of US commercial leases include cost recovery provisions for energy efficiency investments, creating a persistent underinvestment in tenant-occupied spaces.

Workforce shortages constrain retrofit capacity. The National Association of Home Builders reported 406,000 unfilled construction positions in the US as of mid-2025. Specialty trades critical for deep retrofits, including commercial heat pump installation, building envelope air sealing, and advanced controls programming, face even tighter labor markets. Training pipeline expansion is underway through programs like the Building Performance Association's workforce initiative, but graduation rates remain below the levels needed to support the retrofit volumes required by existing BPS timelines.

Key Players

Established Leaders

• Johnson Controls: Operates one of the largest building retrofit and energy services platforms globally, with over $6 billion in annual revenue from building technologies and solutions including OpenBlue digital building management.
• Trane Technologies: Provides commercial HVAC electrification solutions and building performance contracting, with a portfolio of cold-climate heat pumps and energy management systems deployed across 70+ countries.
• Schneider Electric: Delivers integrated building management, energy optimization, and sustainability consulting through its EcoStruxure platform, serving institutional and commercial portfolios worldwide.
• CBRE: Manages energy and sustainability services for over 4 billion square feet of commercial real estate, providing data analytics, benchmarking, and retrofit project management for institutional investors.

Emerging Startups

• BlocPower: Technology-driven building electrification company focused on underserved communities, using machine learning to identify optimal retrofit sequences and financing structures for multifamily and small commercial buildings.
• Kelvin: AI-powered radiator optimization platform for steam-heated buildings, reducing heating energy consumption by 20-30% in pre-war multifamily and commercial buildings without replacing existing infrastructure.
• Sealed: Home and building energy savings-as-a-service company that finances and manages weatherization and heat pump projects with performance guarantees, eliminating upfront cost barriers for building owners.
• Measurabl: ESG data management platform purpose-built for commercial real estate, enabling portfolio-wide energy benchmarking, BPS compliance tracking, and climate risk assessment across thousands of properties.

Key Investors and Funders

• Breakthrough Energy Ventures: Has invested over $300 million in building decarbonization technologies including advanced heat pumps, building envelope materials, and grid-interactive building controls.
• US Department of Energy: Administers over $3.5 billion in building efficiency and electrification funding through the IRA, including the $1 billion National Building Performance Standards Coalition support program.
• Green Climate Fund: Provides concessional financing for building energy efficiency programs in developing countries, with $1.2 billion committed to built environment projects through 2025.

Signals to Watch in 2026

Signal	Current State	Direction	Why It Matters
US cities with active BPS	40+ cities and states	Expanding to 60+ by end of 2026	Regulatory coverage determines addressable retrofit market
Commercial heat pump market share (new HVAC)	38% in leading regions	Growing 15-20% annually	Electrification velocity determines operational carbon trajectory
Average deep retrofit cost per sq ft	$45-85 for commercial	Declining 5-8% annually	Cost reductions unlock mid-market building segments
Section 179D utilization rate	22% of eligible projects	Increasing with IRS guidance clarification	Tax incentive adoption signals market readiness
Green lease adoption in new commercial leases	15%	Growing but slowly	Split incentive resolution unlocks tenant-occupied retrofit market
Grid interconnection wait times for electrification	12-24 months in dense markets	Worsening in constrained markets	Infrastructure bottleneck determines electrification pace

Red Flags

BPS enforcement delays and weakening. Several cities that enacted building performance standards have delayed compliance deadlines or reduced penalty structures in response to real estate industry lobbying. If enforcement timelines slip by more than two years in major markets like New York or Washington DC, the regulatory signal weakens and building owners may defer retrofit investments, creating a self-reinforcing cycle of delay.

Rising construction costs outpacing incentive growth. Retrofit project costs have increased 18-25% since 2022 due to labor shortages, material inflation, and supply chain disruptions. While IRA incentives are substantial, they were calibrated to pre-inflation cost structures. If the gap between project costs and available subsidies widens, the effective payback period for deep retrofits extends beyond the 5-7 year threshold that institutional investors require.

Natural gas price declines reducing electrification urgency. Low natural gas prices weaken the operating cost argument for switching from gas heating to heat pumps. In markets where gas remains cheap, the primary driver for electrification shifts from economics to regulation. If BPS enforcement is simultaneously weak, building owners in gas-dependent regions may defer electrification indefinitely.

Embodied carbon blind spots in retrofit programs. Most BPS regulations and incentive programs focus exclusively on operational energy and emissions, ignoring the embodied carbon of retrofit materials and systems. As retrofit volumes scale, the cumulative embodied carbon of replacement HVAC equipment, insulation materials, and facade systems becomes significant. Without whole-life carbon accounting in regulatory frameworks, the net climate benefit of large-scale retrofit programs may be smaller than projected.

Action Checklist

• Benchmark current building portfolio energy use intensity against applicable BPS thresholds and identify properties at compliance risk
• Conduct investment-grade energy audits for properties requiring deep retrofits, prioritizing buildings with the largest gap between current performance and regulatory targets
• Evaluate heat pump electrification feasibility including electrical service capacity and utility interconnection timelines
• Structure green lease provisions in new and renewing leases to enable cost recovery for efficiency investments
• Layer available incentives including Section 179D, state programs, and utility rebates to maximize effective subsidy coverage
• Assess embodied carbon of retrofit material specifications and establish whole-life carbon budgets for major projects
• Develop workforce relationships with qualified retrofit contractors and reserve capacity 12-18 months ahead of planned project starts

FAQ

What is the typical payback period for a deep energy retrofit of a commercial building? Payback periods vary widely depending on building type, climate zone, existing conditions, and incentive availability. For institutional-quality commercial buildings in regulated US markets with full incentive stacking, simple payback periods typically range from 4 to 8 years for comprehensive retrofits achieving 40-60% energy reductions. When including the value of avoided BPS penalties, improved tenant retention, and asset value appreciation, risk-adjusted returns can reach 12-18% IRR over a 10-year horizon.

How do building performance standards affect property values? BPS regulations create a measurable compliance cost for underperforming buildings and a valuation premium for high-performing ones. Research from NYU's Stern Center for Sustainable Business found that buildings in New York City subject to Local Law 97 penalties experienced 3-6% valuation discounts in 2024-2025 transactions relative to compliant peers. Conversely, buildings that meet or exceed BPS targets benefit from lower operating costs, higher tenant demand, and reduced regulatory risk, supporting premium valuations.

Can existing buildings realistically achieve net-zero operational carbon? Yes, though the path varies by building type and location. Most commercial buildings can achieve 50-70% energy use reductions through envelope improvements, HVAC electrification, lighting upgrades, and advanced controls. The remaining energy demand can be met through on-site solar where feasible and verified renewable energy procurement. Over 500 commercial buildings in the US have achieved net-zero operational carbon certification through programs like the International Living Future Institute's Zero Energy certification and LEED Zero.

What role does embodied carbon play in retrofit decision-making? Embodied carbon is increasingly relevant as operational carbon decreases. A deep retrofit that replaces a building's HVAC system, windows, and insulation generates significant upfront embodied carbon from manufacturing and installing new materials. Best practice requires comparing the embodied carbon of retrofit materials against the operational carbon savings achieved over the remaining building life. For most commercial buildings with 30+ year remaining lifespans, deep retrofits deliver net carbon benefits within 3-5 years, but material selection (low-carbon insulation, recycled steel, responsibly sourced timber) can improve this ratio substantially.

Sources

1. International Energy Agency. "2025 Global Status Report for Buildings and Construction." IEA/UNEP, 2025.
2. CBRE. "US Green Building Adoption Index 2025." CBRE Research, 2025.
3. Empire State Realty Trust. "2025 Sustainability Report: Portfolio Decarbonization Progress." ESRT, 2025.
4. US Department of Energy. "Inflation Reduction Act: Building Efficiency Tax Incentives Implementation Guide." DOE, 2025.
5. ASHRAE. "Commercial HVAC Market Trends Report 2025." ASHRAE, 2025.
6. Building Owners and Managers Association. "Green Lease Leader Program: 2025 Market Analysis." BOMA, 2025.
7. NYU Stern Center for Sustainable Business. "Building Performance Standards and Commercial Real Estate Valuations." NYU, 2025.
8. National Association of Home Builders. "Construction Workforce Shortage Analysis: Mid-Year 2025." NAHB, 2025.