Dormer vs. Extension: The Complete Guide
What Is a Dormer?
A dormer is a structural element that protrudes from the slope of your roof, typically containing a window. It increases usable space in upper-level rooms or attics, providing light, ventilation, and headroom.
Types of dormers include:
- Gable Dormers
- Shed Dormers
- Hipped Dormers
- Flat Roof Dormers
They’re especially ideal if you want to expand an attic into a livable space or add another bedroom or bathroom upstairs without changing your home’s footprint.
What Is a Home Extension?
A home extension adds square footage to the ground level of your home, extending outward from the existing structure. This is commonly used to add new kitchens, family rooms, master suites, or home offices.
Types of extensions include:
- Rear extensions
- Side extensions
- Wraparound extensions
- Sunrooms or enclosed porches
If your property has sufficient yard space and zoning allows, a home extension can provide significant room and flexibility for long-term living needs.
Dormer vs. Extension: Side-by-Side Comparison
| Feature | Dormer | Extension |
|---|---|---|
| Cost | $$ (Lower overall cost) | $$$ (More expensive) |
| Added Square Footage | Moderate (Upper level only) | High (Full new rooms possible) |
| Construction Time | 4–8 weeks | 8–16 weeks |
| Permitting | Moderate | Extensive zoning review |
| Impact on Yard Space | None | Reduces yard space |
| Resale Value | Good ROI | High ROI for large additions |
Pros and Cons of Dormers
Pros:
- Less expensive than an extension
- Retains your backyard/lot size
- Adds character and curb appeal
Cons:
- Limited to attic or second floor
- May involve roofline alteration
- Smaller increase in usable space
Pros and Cons of Extensions
Pros:
- Major increase in living space
- Design flexibility (open floor plans, bedrooms, etc.)
- Ideal for growing families
Cons:
- Higher cost
- More complex permitting/zoning
- May sacrifice outdoor space
How to Decide What’s Right for Your Long Island Home
Ask yourself the following questions:
- Do I want to build upward or outward?
- Am I expanding a bedroom, kitchen, or attic space?
- Do local zoning laws allow for this type of construction?
- How much am I willing to spend?
- Will this investment increase my home’s value?
It also helps to speak with experienced contractors who understand local building codes and permit requirements.
Trusted Home Addition Experts in Long Island
Whether you're leaning toward a dormer or a full home extension, the experts at Cascella & Sons are here to help.
We specialize in high-quality construction, custom design, and zoning expertise throughout Long Island. Learn more about our home extension services here or contact us today for a free consultation.
Start your home expansion journey today!