Maui’s beaches and reefs aren’t just postcard-perfect; they’re critical assets for homeowners, small businesses and the island’s economy. Building or remodeling near the coast requires navigating the Special Management Area (SMA) rules, which determine whether a project needs a detailed permit review. Now Maui County has launched a comprehensive study of where those SMA boundaries fall. For anyone planning a new home, an addition, or commercial development near the shoreline, this study could redefine what is permitted and where. In this article we explain why the county is reevaluating its coastal boundaries, what the process involves and how proactive planning can save you time and money.

Why the boundary matters for your project

The SMA rules designate a broad strip of land around Maui’s coastline where development must meet stringent environmental standards. If your property lies inside the SMA, even a small project may require a permit that looks at drainage, cultural resources, public access and sea-level rise impacts. The boundaries were originally drawn in 1975 based on simple criteria: anything makai (seaward) of a major highway fell under SMA jurisdiction. Over the decades sea levels have risen, rainfall patterns have shifted and demand for housing and business space has grown. Yet those lines have hardly changed.

The county updated its shoreline setback rules in 2024, requiring buildings to be set back as far as 60 feet to 130 feet depending on erosion rates. That update does not alter the wider SMA boundary. As a result, builders and remodelers must still rely on decades-old delineations that may not reflect today’s hazards or development needs. The new boundary study aims to fix that by asking a simple question: Does this boundary make sense? If you own property near the coast, where that line is drawn could decide whether your project qualifies for a streamlined minor permit or a more involved major permit.

What the study will evaluate

The Planning Department’s request for proposals calls for consultants to examine whether expanding or contracting the SMA boundary would better protect Maui’s coast while balancing development needs. According to Planning Director Kate Blystone, the shoreline boundary update last year was a narrow adjustment; now it’s time to look at the much larger SMA boundary. The county wants experts to:

• Assess current conditions. Consultants will analyze sea-level rise projections, erosion hazard maps and flood data to see how the existing boundary aligns with risks. Blystone noted that newer scientific models from the Pacific Islands Ocean Observing System and University of Hawaiʻi Sea Grant show how different sea-level scenarios could affect Maui’s coast. They will use this data to propose boundary lines based on science rather than arbitrary landmarks.
• Model impacts on permitting. The study will look at how moving the boundary inland or seaward would change the number of parcels subject to SMA review and the associated costs and timelines. Adding more land to the SMA could increase oversight for projects, while shrinking the area might free some developments from review but risk environmental damage.
• Engage the public. Community meetings and workshops will gather feedback from homeowners, business owners, environmental groups and developers. The RFP describes public engagement and technical analysis as core components. The consultant’s recommendations will then go to the Planning Commission and County Council, with a report due by December 2026.

Potential changes for builders and businesses

Any adjustment to the SMA boundary has practical implications for your project:

More properties could require permits

If the boundary is drawn further inland to reflect new erosion and flood hazards, more parcels will fall under SMA jurisdiction. Home renovations, accessory structures, parking lots or business expansions that previously didn’t need a permit may now require one, adding months of review. For major commercial builds, the difference could mean preparing a full Environmental Assessment and attending public hearings.

Some properties may gain flexibility

Conversely, if analysis shows that certain inland areas aren’t at high risk, those properties may be removed from the SMA. Projects there could proceed with less red tape, good news for homeowners wanting to add an ohana unit or remodel a kitchen, or for small businesses expanding their footprint. However, the county hasn’t hinted at shrinking the boundary; Planning Director Ana Lillis said the goal is to ensure policies remain current and responsive to changing shoreline conditions.

Resilience will be essential

Whether or not your project sits in the SMA, Maui’s shoreline is changing. Builders are increasingly raising structures on stilts, relocating buildings away from the coast and using erosion-resistant materials. Even if your lot escapes the SMA, the updated setback rules still require thoughtful design. Climate-resilient features not only protect your investment but also demonstrate to regulators and neighbors that you’re building responsibly.

Uncertain timeline

The county has not committed to any specific boundary changes. Officials emphasize that the study may recommend leaving the line where it is. Final decisions could take until 2027 after public hearings and council approval. Nonetheless, simply studying the boundary signals that Maui’s development landscape is evolving, something savvy builders and businesses should plan for.

How to prepare now

Waiting until the new boundary is finalized could leave you scrambling. Here’s how to stay ahead:

1. Know your property’s status. Check the county’s interactive maps or contact the Planning Department to see if your lot is currently within the SMA. Keep an eye on the study’s progress; you may find your property included or excluded in early recommendations.
2. Follow public meetings. Attend community workshops when the consultant team asks for feedback. Your input as a homeowner or business owner is valuable and can influence where lines are drawn.
3. Start designing with resilience. Even if your project is outside the SMA, incorporate sea-level rise projections and erosion data into your plans. Doing so can avoid costly redesigns later and may speed up approvals.
4. Plan your timeline. Permits can take months. If you anticipate your property could end up inside the SMA, begin gathering surveys, site plans and environmental documentation now to avoid delays.
5. Work with experts. Navigating environmental regulations, community concerns and design requirements isn’t something you should do alone.

Why partner with Shoreline Consulting Hawaiʻi

At Shoreline Consulting Hawaiʻi, we help homeowners, remodelers and businesses throughout the islands turn visions into reality while respecting our fragile coast. Here’s why our clients trust us:

• Up-to-date guidance. We track every rule change and study, from shoreline setbacks to SMA minor permit thresholds. We can tell you exactly how a boundary shift might affect your specific project and whether a permit is required.
• Comprehensive applications. For projects inside the SMA, we prepare complete packages, site plans, environmental narratives, drainage studies and cultural assessments, that meet county standards. Our experience shortens the review process and minimizes costly revisions.
• Resilient design solutions. We can help guide the architectural and design process to account for sea-level rise and erosion. We’ll help you elevate structures, choose durable materials and incorporate landscaping that stabilizes shorelines.
• Community outreach. Public input matters. We coordinate with neighborhood boards, cultural practitioners and environmental advocates to build support for your project and address concerns early.
• Strategic planning. Our consultants can map out different scenarios based on potential boundary changes, so you can decide whether to move forward quickly or wait until the new lines are set. We’ll also help you take advantage of any future exemptions or incentives.

Final thoughts

Maui’s decision to examine its coastal management boundaries reflects a growing awareness that our island’s environment, and the rules governing it, must adapt. For homeowners dreaming of a seaside addition, contractors building homes for clients or businesses planning a coastal facility, this study is a signal to plan proactively. The SMA boundary hasn’t changed in 50 years, but the world around it has. By staying informed and working with experienced consultants like Shoreline Consulting Hawaiʻi, you can navigate these evolving regulations, design projects that stand up to the elements and bring your vision to life without unpleasant surprises.