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Reviewed by Alexander Hamilton Li, Architect & General Contractor · CSLB #1078806 · Updated July 2026
Double hung windows are the classic American window style, featuring two independently operable sashes that slide vertically. The ability to open both top and bottom sashes simultaneously creates a natural convection loop — warm air exits through the top while cooler air enters from the bottom — reducing reliance on mechanical cooling during Bay Area’s mild shoulder seasons.
Modern double hung windows from Andersen, Marvin, and Pella include tilt-in sashes for safe interior cleaning, integrated window screens, and cam-action locks that compress weatherstripping for an airtight seal. We install double hung windows in wood, fiberglass, vinyl, and aluminum-clad frames.
The traditional double hung profile is architecturally appropriate for Victorian, Craftsman, Colonial Revival, and Edwardian homes found throughout San Francisco, Berkeley, Oakland’s Rockridge, and Alameda’s Gold Coast — neighborhoods where period-accurate window replacements preserve both character and property value.
Double hung replacement follows a careful process in historic homes. We measure the existing window to confirm the rough opening size, remove the old sash and frame without disturbing the surrounding plaster or woodwork, inspect the framing for moisture damage or termite activity (common in pre-war Bay Area homes), install new flexible flashing and a sill pan, set the replacement unit, insulate with low-expansion foam, and finish with period-appropriate interior casing. Each window takes 45–75 minutes depending on trim complexity. A Victorian with 15–20 windows is typically completed in 2–3 days.
Double hung windows handle Bay Area conditions well when properly specified. The natural convection ventilation is especially effective during San Francisco’s warm September–October season and in East Bay inland areas where summer afternoons reach 85–95°F. For noise-sensitive locations near Caltrain, BART, or busy streets like Van Ness or Market, upgrading to laminated glass in double hung frames achieves STC ratings of 32–35. Double hung is the best choice when historic accuracy matters — San Francisco’s Planning Department and Oakland’s Landmarks Preservation Advisory Board both recognize double hung as the default replacement type for pre-1940 homes.
How Do Double-Hung Windows Compare to Other Styles?
| Feature | Double-Hung | Single-Hung | Casement |
|---|---|---|---|
| Cost per window installed | ~$950 | ~$850 | ~$1,050 |
| Ventilation | Both sashes (convection) | Bottom sash only | Full sash opening |
| Ease of cleaning | Easy (both sashes tilt in) | Moderate (top sash fixed) | Easy (opens outward) |
| Heritage compatibility | Excellent (Victorian, Craftsman) | Good | Modern aesthetic |
| Energy efficiency (U-factor) | 0.27 | 0.25 | 0.22 |
How Much Do Double-Hung Windows Cost?
Double-hung window installation in the Bay Area costs approximately $950 per window fully installed, including the window unit, labor, interior and exterior trim, and weathersealing (Hamilton Exteriors project data, 2024–2026). Material cost accounts for roughly $375 of that total. A whole-house replacement project with 15–20 double-hung windows typically costs $14,250 to $19,000. Double-hung windows cost about $100 more per unit than single-hung alternatives due to the second operable sash and additional balance hardware. Brands like Andersen, Marvin, and Pella offer period-accurate double-hung profiles that match Victorian, Craftsman, and Colonial Revival architectural styles common throughout Berkeley, Alameda, and San Jose historic districts. The U.S. Department of Energy reports that ENERGY STAR-qualified windows save homeowners $125–$465 per year on energy bills, helping offset the upfront investment over the window's 25–30 year service life.
Single-Hung vs Double-Hung: Which Should You Choose?
The primary difference between single-hung and double-hung windows is that double-hung windows have two operable sashes while single-hung windows have only one. This means double-hung windows allow convection-style ventilation — warm air exits through the top while cool air enters through the bottom — providing more effective natural cooling. Both sashes in a double-hung window tilt inward for easy cleaning from inside the home, a significant advantage for second-story windows. Single-hung windows cost approximately $100 less per unit ($850 vs $950 installed in the Bay Area, per Hamilton Exteriors project data). For homeowners replacing 15–20 windows, that adds up to $1,500–$2,000 in savings. Choose double-hung when ventilation flexibility and cleaning convenience matter. Choose single-hung when budget is the priority and the windows are accessible from ground level for exterior cleaning.
What Homeowners Say About Our Work
Real reviews from verified Northern California homeowners.
deborah maxey
in the last week
Great job and very professional the 1st photo is before and the other 2 is upon completion of work.
Eric W.
via Yelp
Hamilton Exteriors did an amazing job on my roof. The team was professional, and the quality of work was top-notch. Highly recommend!
Robert H.
via Angi
From the very first consultation, we knew we'd made the right choice. The team was knowledgeable and genuinely listened to our concerns about energy efficiency and design. We've already noticed a drop in our energy bills.
Laura G.
via Nextdoor
Hamilton Exteriors repaired extensive dry rot damage on our home's exterior. Their attention to detail and commitment to quality were evident throughout the project. Our home looks better than ever.
Frequently Asked Questions
Didn't find the answer to your question? Call Now (650) 977-3351
What areas do you serve?
We serve Northern California across three regions: the San Francisco Bay Area (six counties from Alameda to Santa Clara), Greater Sacramento (Sacramento out to Roseville, Folsom, and Davis), and the Central Valley (Stockton to Modesto). Our crews are based in Castro Valley. We handle permits and know the building codes for each jurisdiction, which matters because requirements and fees vary significantly between cities.
How does billing and financing work?
We offer $0-down financing with approved credit, 12-month same-as-cash plans, and extended terms up to 15 years for larger projects. You only pay for completed, inspected work — we never ask for full payment before the job is done. Your project manager will walk you through every option during your estimate appointment. We also accept checks, ACH, and all major credit cards.
Are you licensed and insured?
Yes. CSLB License #1078806 — verify it anytime at cslb.ca.gov. We carry $2M general liability, full workers’ comp, and are bonded per California law. We hold GAF Master Elite, Owens Corning Preferred, CertainTeed ShingleMaster, and James Hardie Elite Preferred certifications — each requires annual training and quality audits to maintain. We’re happy to provide proof of insurance before any work begins.
Do I need a permit for my exterior project?
Most exterior projects in Northern California require a building permit. Fees vary by city — Oakland runs $200–$600, Peninsula cities often more. We handle the entire permit process: application, plan submission, and scheduling inspections. Permit fees appear as a separate line item in your estimate so you’ll see every cost upfront. For homes in WUI fire zones (Berkeley Hills, Oakland Hills, parts of Marin), we ensure full compliance with local fire-rated material requirements.
Are double hung windows good for historic Bay Area homes?
Yes. Double hung is the historically correct window type for Victorians, Craftsmans, Edwardians, and Colonial Revival homes. Manufacturers like Marvin and Andersen offer narrow sightlines and divided-lite patterns that match original window proportions for preservation compliance.
How much do double hung replacement windows cost?
Double hung windows cost $700–$1,500 per window installed in the Bay Area. Vinyl frames are most affordable; wood and aluminum-clad options cost more but offer the authentic appearance required in historic districts.
How long does double hung window replacement take?
Each double hung window takes 45–75 minutes to install, depending on interior trim complexity. A full Victorian or Craftsman home with 15–20 windows is completed in 2–3 days. We protect original plaster, hardwood floors, and millwork throughout the process.
Are double hung windows energy efficient enough for Title 24?
Yes. Modern double hung windows from Andersen and Marvin with dual-pane Low-E glass and argon fill achieve U-factors of 0.27–0.30, meeting Title 24 prescriptive requirements for Bay Area climate zones. The cam-action locks compress weatherstripping for an airtight seal that significantly outperforms original single-pane wood sash windows.
Should I choose double hung or casement windows for my older home?
For Victorians, Craftsmans, and Edwardians, double hung is the historically correct choice and may be required by local preservation boards in San Francisco, Berkeley, and Alameda. Casement windows offer better energy performance (U-factor 0.22 vs. 0.27) and airflow, but their outward-opening profile is not period-appropriate for pre-1940 home styles.
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21634 Redwood Rd Unit F, Castro Valley, CA 94546
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