Bungalow Addition Ideas & Costs

Bungalows are beloved for their simplicity, charm, and efficiency. These homes are especially common in cities like Chicago, Los Angeles, Portland, and Denver, where early 20th-century neighborhoods feature rows of single-story residences with cozy footprints. As lifestyles change and families grow, one of the most practical ways to gain extra space is by adding an addition to a bungalow—whether it’s an expanded kitchen, new family room, or even a full second floor.

Because bungalows often have modest square footage and low rooflines, expanding them requires special considerations but isn’t impossible. When done with care, a bungalow addition can preserve character while opening up entirely new possibilities for how a home functions and feels.

Common addition options for bungalows

Bump-outs

A bump-out is a smaller extension that pushes one wall outward to expand an existing room, like a kitchen, dining room, or bathroom. It’s an ideal choice for bungalow owners that want extra comfort or function without major construction. Because these additions are compact, they minimize disruption while improving daily livability.

Typical cost range for bungalows: $20,000–$75,000 depending on size, structure, and finishes.

Adding new rooms

Adding an entirely new room gives your bungalow a major livability upgrade. It’s a versatile way to expand without disrupting the home’s core structure or charm. These additions are often built off the rear or side of the house, where there’s more flexibility for extending the foundation and integrating the roofline. 

Bungalow homeowners often build this type of addition to create guest suites, extra bathrooms, or multi-purpose spaces. 

Typical cost range for bungalows: $80,000–$150,000 depending on size, complexity, and structural work required.

For more guidance, read How Much Does It Cost to Add a 12x12 Room to a House? and How to Calculate the Cost of a Room Addition.

Second floor addition

A second floor addition transforms a single-level bungalow into a spacious multi-story home. It’s ideal in dense urban areas where lot sizes limit outward expansion. Adding upward allows homeowners to double livable space while preserving the yard and footprint that define traditional bungalows.

Typical cost range for bungalows: $175,000–$300,000+, depending on square footage, framing, and finishes.

Factors and decisions that influence addition costs

Bungalow additions vary widely in price depending on the design, size, and complexity of the project. Understanding the main cost drivers helps you set a realistic budget and make decisions that align with your goals.

• Size and square footage of the addition
• Structural changes or foundation reinforcement required
• Location of the addition (rear, side, or second floor)
• Level of interior finish and material selection
• Design complexity and roofline integration
• Permit, zoning, and inspection fees
• Accessibility or site challenges (lot slope, narrow access, etc.)
• HVAC, plumbing, and electrical upgrades
• Labor market and contractor availability in your region
• Energy-efficient upgrades and sustainability choices

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Considerations when extending your bungalow

• Roofline: Maintaining a cohesive roofline is essential. Many bungalows have low-pitched roofs that define their silhouette. Keep new structures consistent with the original slope and height to retain visual harmony. A unified roofline helps the entire home feel intentional rather than pieced together.
• Foundation strength: Older bungalows may have shallow or limited foundations. Before construction, a structural engineer should assess whether reinforcement is needed. Strengthening the base early prevents issues with settling or cracking later. A solid foundation also supports longevity and keeps future maintenance costs manageable.
• Interior flow: An addition should feel like a natural extension of your existing home. Plan transitions thoughtfully—consistent ceiling heights, finishes, and lighting keep spaces connected. The goal is to create flow, not just square footage. Well-designed circulation can make a home feel larger and more cohesive without adding unnecessary complexity.
• Natural light: Additions can unintentionally block sunlight. Incorporate large windows, skylights, or glass doors to keep interiors bright and balanced. Preserving natural light is key to maintaining the charm typical of bungalow living. Thoughtful placement of openings also enhances ventilation and improves overall comfort.
• Zoning and permits: Every city has its own setback, height, and design rules. Understanding them early helps avoid costly changes later. This step also ensures your project is compliant before construction begins. Staying ahead of local regulations can reduce approval times and keep your project moving smoothly.
• Energy efficiency: Expanding your home offers an opportunity to upgrade insulation, windows, and HVAC systems. Invest in energy-efficient materials while walls are open. These improvements can reduce long-term utility costs and improve comfort. Taking this step now means your new space will perform better and feel comfortable year-round.

Trust your bungalow addition to a skilled contractor from Block Renovation

Expanding a bungalow is a major investment in both time and trust. Block Renovation connects homeowners with vetted, licensed contractors equipped to handle the complexities of bungalow additions. With transparent estimates, expert-reviewed scopes, and secure progress-based payment systems, Block gives homeowners clarity and confidence through every stage of construction.

From a simple bump-out to a full second story, working with Block helps ensure that craftsmanship meets design—and that every square foot feels intentional and well built.

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