What Is Adaptive Reuse Architecture?

How Philadelphia’s Old Buildings Get a Second Life

You have probably walked by a half-block, five-story factory building with the windows infilled, its walls covered in graffiti, neglected for years. It is the kind of building with great potential: undeniable neighborhood character, good bones, and staying power. Its original purpose is no longer viable, but with imagination, there is a real opportunity for something new with a modern purpose. Do you ever find yourself wondering, “What’s the vision for this building? What will its next chapter be?”

What happens to these types of old buildings? A neglected factory, a shuttered church, an old school, an abandoned brownstone? The answer is adaptive reuse, and our Team at Toner Architects specializes in these building transformations.

What Is Adaptive Reuse?

Adaptive reuse is taking an existing purpose-built building and reimagining it for a new use, rather than tearing it down and building a new building.

In simple terms, it’s about reusing what’s already there and making it work for today.

Common Examples of Adaptive Reuse Projects

There are many types of adaptive reuse projects. Our team at Toner Architects has experience in converting historic structures and repurposing old buildings, including:

• Church to Apartment Building
• Church to Daycare
• School to Apartment Building
• School to Small Business and Artist Spaces
• Single Business Office Building to Small Business and Artist Spaces
• Large Rowhouse (Single Family Brownstone) to Apartments
• Religious Building to Single Family Row Houses
• Factory to Apartment
• Factory to Artist Spaces & Gallery Space
• Factory to Distillery
• Factory to Retail
• Factory to Office
• Shopping Mall to Food Packaging Facility
• Corner Store to Restaurant
• Office to Restaurant
• Institutional to Apartments
• Retail to Office

Why Does Adaptive Reuse Matter?

Environmental Benefits

Adaptive reuse is one of the most environmentally responsible and sustainable ways to build. By keeping and repurposing existing structures, we can significantly reduce the amount of demolition debris sent to landfills while also limiting the demand for new raw materials. Many of the walls, beams, and existing foundations can remain in place. The items that remain are resources that don’t need to be extracted, manufactured, and transported again.

Another advantage is the reuse of a previously developed site. All of the utility connections, road, and community services already exist for the existing building. Keeping buildings within the existing community lowers transportation emissions and encourages walkability, biking, and transit use.

Sometimes existing buildings will need environmental remediation due to past contamination. The cleanup process can remove or safely contain contaminants and improve the local environmental and public health. Reusing existing buildings avoids harming untouched ecosystems, protects biodiversity and natural habitats, and limits urban sprawl.

A major positive impact of adaptive reuse is embodied carbon, the energy and emissions already “built into” a building from its original construction. Embodied carbon is the carbon footprint of a building’s materials and construction, including everything from manufacturing and transportation to assembly. Demolishing a structure and starting over discards that investment of already spent carbon and replaces it with a new wave of carbon-intensive activity. Adaptive reuse preserves much of that embodied carbon, making it a far more sustainable choice. For clients who prioritize environmental responsibility, this approach aligns with broader sustainability goals and reflects a thoughtful, forward-looking investment.

The sustainable adaptive reuse approach resonates strongly with our clients today, many of whom are looking for practical ways to reduce environmental impact without sacrificing quality or character. Adaptive reuse aligns naturally with these priorities, and Toner Architects brings proven experience in delivering sustainable projects of all scales and sustainability levels. Many of the Toner Team have LEED Accreditations along with a proven track record of numerous projects that have achieved Enterprise Green Communities certification, reflecting a commitment to thoughtful, measurable sustainability. It’s not just about preserving buildings, it’s about creating spaces that perform better for both people and the environment.

Preserving Community History

The outrage, sadness, and mourning the community experiences when large historic buildings are removed from the existing neighborhood fabric can be felt for years. Our goal at Toner Architects is to help communities keep their beloved buildings by providing them with a new life and purpose. This way, they can continue their roles as community anchors and landmarks.

We love the stories we hear: Aunt Lisa & Uncle Tony’s wedding at the church and how the cake almost didn’t make it into the church hall, Grandpa’s work stories from the factory and the hoagies he would get from the best little deli across the street, and the countless tales of previous students’ school experiences. These buildings have provided the backdrop of day-to-day life for countless years. They are a wayfinding symbol, a cultural and meeting place, and a jewel box of memories that are core to the neighborhood’s identity.

In addition to the memories, the craftsmanship would not easily be replicated today. The large expansive windows, the vaulted ceilings, the heavy timber trusses, and the brick detailing all would add considerable cost and time to a new construction project. Saving the existing features is priceless.

Economic Advantages

Adaptive reuse can make strong financial sense. In many cases, there can be lower development costs due to the reuse of the existing building. This includes less structural work since the foundation, exterior walls, and some floors already exist. There is reduced labor and materials cost due to the existing structure, and because the site work is already in place, there can be savings on the site design and construction.

Many times, adaptive reuse projects have shorter timelines than new construction. And time equals money! These shorter timelines lead to occupying the building sooner!

If the building is historic, it could qualify for Historic Tax Credits at both the State and federal levels. The City of Philadelphia has a tax abatement for historic buildings undergoing construction and adaptive reuse. And there are also multiple other programs available depending on the end use and location of the building, including Low-Income Housing Tax Credits, local grants, and redevelopment subsidies.

Most importantly, there is huge value in neighborhood revitalization and returning the building to a productive use. Neighborhood revitalization creates measurable economic value through higher property sale prices and rental rates, increased property tax revenue for municipalities, and stronger comparables for future development. Revitalization often is a catalyst for more development, which unlocks financing and creates momentum. Through revitalization, there are benefits such as job creation through the construction activities, permanent jobs for the end use of the building, and increased spending at local businesses.

What Makes Adaptive Reuse Challenging?

Navigating Zoning and Building Codes

One of the first steps to analyzing the potential of an adaptive reuse project is a code analysis. This includes both zoning and building codes.

Zoning codes vary by municipality. The zoning code rules what uses are permitted, as well as the size (and sometimes form) of a building. Zoning codes can be dense and confusing, so having an expert go through all the relevant elements is a must. If the building is historic, there may be parts of the zoning code that allow exceptions from certain requirements, or even bonuses for the developer. Knowing the zoning code and how it applies to your project is crucial–it will tell you how many apartments you can have, whether a restaurant is allowed, whether you can build an addition, and even how much parking will be required.

The second major code to review is the building code. This is the code that covers structure, materials, and life-safety elements such as fire ratings, sprinklers, stairs, corridors, windows, and doors, among other things. Older buildings were not built to modern standards, and in an adaptive reuse situation, they weren’t built for the use you may be proposing. A full building code analysis will help you understand where your pain points might be and what hurdles you’ll face during the conversion.

Toner Architects has experts in both the zoning and the building code. This expertise includes a deep understanding of the codes and, more importantly, the way that code officials interpret them. This allows us to guide you along a path to your goal that provides the least resistance, and also allows us to suggest alternatives and opportunities you might not have considered yet.

Structural Surprises

It’s impossible to predict all the surprises that might come up on a project. However, through experience and careful study of past projects, our team knows what is most likely to arise, what to look for, and what questions to ask.

Whether it’s hidden structural failures, leaks, asbestos, or outdated systems, finding issues and building them into the project’s budget and schedule is essential for success. Our team has learned to be “stewards” of old buildings–loving the good parts and knowing how to deal with the shortcomings of a building that was built in another era (and maybe hasn’t been well cared-for in a while).

Balancing Old and New

One of the central challenges in adaptive reuse is finding the right balance between preservation and transformation.

• How much do you keep?
• What do you change?
• How do you make a building designed for a completely different purpose adapt to a new function?
• How do you fit in modern systems?
• How do you balance client proformas and expectations?

These decisions are rarely straightforward. Existing materials may be deteriorated, layouts may not align with new uses, and code requirements often require significant intervention. At the same time, those very constraints are what make these projects compelling.

At Toner Architects, we see this tension as an opportunity. The goal is not to freeze a building in time, but to thoughtfully evolve it, retaining or repurposing the elements that give it character while introducing new systems, layouts, and uses that allow it to thrive again. When done well, the contrast between old and new doesn’t feel forced; it feels intentional. The building’s history becomes part of the experience, not an obstacle to overcome.

How Toner Architects Approaches Adaptive Reuse

Adaptive reuse projects require a different mindset than new construction. Old buildings demand patience, investigation, a vision, and a willingness to respond to what the building reveals over the course of the project. At Toner Architects, we approach this work as stewards of the building. As stewards, we seek to understand the building’s history, materials, and structure before making decisions about its future. Our process is grounded in uncovering potential, navigating constraints, and delivering practical, buildable solutions that respect both the building and the client’s goals.

Step 1: Deep Study of the Existing Building

Every project begins with a thorough understanding of what exists. This starts in the office with a review of public documents. Is the building on the local or national historic register? What is the current zoning? What is the zoning and building permit history? What code issues should we be worried about? What hearings does the local municipality require?

Next, we continue in the physical building. This study includes 3D scanning that provides detailed measurements and photo documentation, documentation of structural systems, documentation of existing utilities and systems, and identification of deficiencies such as settlement, water infiltration, or material deterioration. Additional destructive investigation is often needed, including digging test pits to determine foundation depth, removing portions of ceilings to reveal floor and roof structure, and opening walls to determine structural systems and bearing locations.

We treat this phase as critical groundwork, because informed design decisions can only come from a clear understanding of the building’s current condition. Often, this process reveals both challenges and unexpected opportunities that shape the direction of the project.

Step 2: Feasibility and Zoning Analysis

Before the design even starts, we evaluate what is actually possible. In our initial service proposal, we outline what approvals we believe are needed for the specific project. In design, this outline converts into a feasibility study. This feasibility study looks at the relevant building codes, zoning codes, and historic requirements to determine whether a proposed use aligns with local regulations, what approvals may be required, and the timelines that would apply for the different approvals. Simple sketches are then created to illustrate the proposed designs. These simple sketches typically show space sizes and circulation. These can be used by the owner to determine if the project can work with their expectations of use and finances for the building and project.

In Philadelphia, this often involves navigating the complex zoning code, zoning board of adjustment process, including registered community organization (RCO) meetings, historic commission process, including public hearings, and the associated considerations for the specific project. Our experience working extensively within these systems allows us to guide clients early, identifying risks, outlining potential paths forward, and helping set realistic expectations for the general timeline and costs.

Step 3: Design That Celebrates History

With a clear understanding of the project constraints and opportunities, the design process focuses on unlocking the building’s potential. Rather than covering up what makes a space unique, we look for ways to highlight it, exposing original materials, preserving key architectural elements, and using light and volume to enhance the experience. The goal is to create spaces that feel authentic to the building while supporting modern use. When successful, the design doesn’t compete with the existing structure; it works with it.

Step 4: Stewardship Through Construction

Adaptive reuse projects don’t stop evolving once construction begins. Unknown conditions are often uncovered, and special moments and details are discovered. Both require quick decisions, sometimes triggering design pivots and close coordination between the design team, contractor, and consultants. Toner Architects remains actively involved throughout construction, helping to resolve field conditions, maintain design intent, and keep the project moving forward. This hands-on approach ensures that the final result reflects both the original vision and the realities of the building.

Adaptive Reuse in Philadelphia

Philadelphia is uniquely suited for adaptive reuse. The city is filled with 19th- and early 20th-century buildings, churches, schools, factories, warehouses, and large single-family homes, all constructed with durable materials and designed with a level of craftsmanship that is difficult to replicate today. These structures offer both challenges and opportunities, making them ideal candidates for transformation.

Toner Architects has worked extensively within this context, helping to reposition buildings for new uses while preserving their architectural character. Completed projects such as the adaptive reuse of Immaculate Conception Church, St. Agnes School, The Mill at Howard, and Appletree Daycare and Learning Center, along with numerous other institutional and industrial buildings, demonstrate how these structures can be successfully reimagined. In a city defined by its history, adaptive reuse is not just a design strategy; it’s a way of continuing Philadelphia’s architectural story.

Frequently Asked Questions About Adaptive Reuse

Adaptive reuse is more than a design strategy, it’s a way of thinking about buildings as long-term assets rather than disposable structures. Adaptive reuse reduces environmental impact, preserves the character and history that define our neighborhoods, and creates spaces that simply cannot be replicated with new construction. When done well, these projects don’t just solve a problem; they elevate a building’s next chapter, turning something overlooked or underutilized into something meaningful, functional, and lasting.

At Toner Architects, this is the work we are most passionate about. We see ourselves as stewards of these buildings, helping uncover their potential and guiding them through a thoughtful, practical transformation. If you’re considering repurposing an existing building, or are simply wondering what’s possible, we would welcome the opportunity to talk. Reach out to start the conversation.