Replacing siding and windows at the same time protects your home’s thermal envelope and maximizes energy savings.
Replacing siding and windows at the same time protects your home’s thermal envelope and maximizes energy savings.
When siding and windows are replaced together, your contractor seals the entire exterior at one time, eliminating the gaps, mismatches, and air leakage that result from phased projects done years apart. For homes throughout Cumberland County, combining both projects also reduces total labor time, disruption, and the long-term cost of doing each job twice.
Why Greater Portland Homeowners Should Consider Doing Both at Once
- Air sealing impact: Installing insulated siding can improve a home’s air tightness by an average of 11%. Along with ENERGY STAR certified windows, you will experience greater savings!
- Insulate Your Home: Nine out of 10 homes in the U.S. are under-insulated. Replacing siding with drafty windows will result in major air leakage. It’s important for Southern Maine homes to completely seal out drafts.
- Energy-efficient siding options: Foam-back insulated vinyl is the most energy-efficient siding option available for New England climates. It’s among the best siding for New England because there’s no warping, cracking, or requiring repainting.
- ROI stacks up: Vinyl siding delivers a 97% ROI at an average cost of $17,590. Meanwhile, window replacement delivers an 76% ROI at an average cost of $21,922. Completing both projects together means your Portland ME home’s resale value gets a big boost!
- Flashing coordination: Windows and siding share critical flashing details at every opening. Replacing one without the other risks improper integration at the seams.
- Single-project efficiency: One contractor, one mobilization, one timeline, one cleanup. Coordinating siding and windows together in Coastal Maine eliminates the repeat disruption.
Benefits of Replacing Siding and Windows Together in the Casco Bay Area
Top Pick: Replacing both siding and windows together for any home in Greater Portland where either component is more than 20 years old. Enjoy better indoor comfort, ROI, and project efficiency. Contact Coastal Windows & Exteriors for a free estimate!
Consider separately: If one component is recently replaced and still performing well — in that case, a certified contractor can assess whether the existing work integrates properly with the new installation.
Financing helps: Both projects together represent a meaningful investment. Financing options up to 20 years based on credit approval can make completing both at once accessible without overextending your budget.
Ready to improve your home’s exterior from top to bottom? Coastal Windows & Exteriors is the #1 woman-owned exterior remodeling contractor in New England, with 7,000+ installations across Massachusetts, New Hampshire, and Maine.
Request a free siding estimate from Coastal Windows & Exteriors.
Browse our complete siding FAQ guide from Coastal Windows & Exteriors.
Explore our siding Exterior Remodeling Home Improvement Help Center.
Last Updated: April 2026
Sources:
- Installing insulated siding can improve a home’s air tightness by an average of 11%. Polymeric Exteriors Insulated Siding Guide Industry guidance on the energy performance and air sealing benefits of insulated siding installations. (Accessed April 2026)
- Nine out of 10 homes in the U.S. are under-insulated. ENERGY STAR Seal and Insulate ENERGY STAR’s guidance on the importance of sealing and insulating homes to reduce energy waste. (Accessed April 2026)
- Vinyl siding in New England averages $17,590 with a 97% return on investment at resale, while window replacement in New England averages $21,922 with a 76% ROI. JLC Online Cost vs. Value 2025 New England JLC Online’s regional cost and resale value data for vinyl siding and window replacement projects in New England. (2026)
