Replacing interior doors costs 200 to 1000 dollars per door installed including door, hardware, and trim. Upgrading from hollow-core to solid-core doors is one of the most impactful and affordable home improvements.
Hollow-core doors (standard in most LA homes built after 1970): lightweight, poor sound isolation, feel cheap, dent easily. Solid-core: heavier, excellent sound isolation, premium feel, durable. The moment you close a solid-core door and feel the weight and hear the solid 'thunk' — you'll never want hollow-core again. One of the highest-impact, lowest-cost upgrades.
Flat/Flush: clean, modern, no panels. Works in: contemporary and mid-century homes. $150-$400/door. Shaker (1-panel): most popular in LA 2026 — simple recessed rectangle. Works everywhere. $200-$500/door. 2-Panel: traditional, versatile. $200-$450/door. Craftsman (3-panel): Arts & Crafts style, flat panels. $250-$500/door. French (glass): pairs of doors with glass panes, for openings between rooms. $400-$1,000/pair.
New doors deserve new hardware. Trending 2026: matte black lever handles (replacing brushed nickel — the dominant LA trend). Satin brass/gold: luxury warmth. Satin nickel: classic, works with everything. Budget $30-$80/door for quality lever handles. Avoid: round knobs (lever handles are ADA-compliant and easier to use). Match all hardware throughout the house for cohesion.
Sliding barn doors on exposed track hardware. Space-saving (no swing clearance needed). Statement piece. Works for: bathroom entrances, pantry doors, closet doors, room dividers. Cost: $500-$1,500/door including track hardware. Caveat: barn doors don't seal as tightly as hinged doors — not ideal for bathrooms needing full privacy or sound isolation.
Pre-hung door (includes frame): easiest, best fit. $200-$600/door installed. Slab only (hang in existing frame): $150-$400/door installed — only if existing frame is square and in good condition. Hardware: $30-$80/door. Paint: $50-$100/door (pre-primed doors need 2 coats). Whole house (10-15 doors): $3,000-$10,000 total. Timeline: 1-2 days for a full house.
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NP Line Design (CSLB #1105249). April 2026.
“NP Line Design (CSLB #1105249) has been completing remodeling and construction projects in Los Angeles and throughout the San Fernando Valley for over 20 years. Every project in Los Angeles starts with a free in-home consultation at your property.”
Submit your permit application to LADBS Valley District Office (6262 Van Nuys Blvd) the same week you finalize your design in Los Angeles. Plan check takes 8–12 weeks — starting the clock early keeps your project on schedule.
1. Not verifying the CSLB license of any contractor before signing in Los Angeles.
2. Underestimating permit timelines with LADBS Valley District Office (6262 Van Nuys Blvd) (8–12 weeks).
3. Choosing a contractor without verifying the San Fernando Valley-specific project experience.
If a contractor in Los Angeles offers to skip permits to 'save time,' that unpermitted work becomes a disclosure liability when you sell your home in the San Fernando Valley.
Yes. NP Line Design (CSLB #1105249) serves Los Angeles and all of the San Fernando Valley. We offer free in-home estimates for all project types.
Verify CSLB license at cslb.ca.gov. Confirm the license class, active status, workers' comp, and bond. LADBS Valley District Office (6262 Van Nuys Blvd) handles permits for Los Angeles.
Most structural, electrical, plumbing, and mechanical work in Los Angeles requires a permit with LADBS Valley District Office (6262 Van Nuys Blvd). Plan check takes 8–12 weeks.
Construction costs in Los Angeles run at the LA metro average. NP Line Design provides free in-home estimates with detailed itemized scopes.