What to Expect During a Whole-Home Renovation in Los Altos: Timeline, Phases, and Process

The Big Picture: 8 to 16 Months, Start to Finish

A whole-home renovation in Los Altos is not a weekend project or even a seasonal one. From the first design meeting through the final punch list walkthrough, you should plan for 8 to 16 months. The range depends on your project’s scope, the complexity of your design, and how smoothly the permitting process goes.

That timeline breaks into two major segments: pre-construction (design, permitting, and procurement) and construction (demolition through punch list). Many homeowners focus on the construction timeline, but in Los Altos, the pre-construction phase is where the most important decisions happen and where local factors like design review can significantly affect your schedule.

This guide walks through every phase from the homeowner’s perspective, so you know what to expect, what decisions you will face, and where delays typically occur. For cost details at each phase, see our whole-home remodel cost guide for Los Altos. For a broader overview of the renovation process, see our complete Los Altos renovation guide.

All pricing is approximate, reflects 2026 Bay Area market conditions, and is subject to change. Every project is unique. Final costs are determined on a project-by-project basis during our design phase.

Phase 1: Design Development (6 to 10 Weeks)

What Happens

The design phase is where your renovation takes shape on paper (and increasingly, on screen). A design-build firm handles architecture, engineering, and construction planning as one integrated team. If you are working with a separate architect and general contractor, this phase may take longer because the two parties need to coordinate independently.

During design development, your contractor’s team will:

• Assess the existing structure through site visits and measurements
• Discuss your goals, lifestyle needs, and aesthetic preferences
• Develop floor plan options and evaluate structural feasibility
• Produce 2D architectural drawings and 3D renderings
• Select materials, finishes, fixtures, and appliances
• Prepare an itemized scope of work with fixed pricing

What You Will Do

This is the most decision-intensive phase of the entire project. You will review floor plan options, compare material samples, visit showrooms, and make selections for everything from cabinetry and countertops to hardware and paint colors.

The benefit of making all these decisions now, before demolition, is that it eliminates the rushed, reactive decision-making that causes change orders during construction. According to AIA research analyzing over 18,000 construction projects, change orders average approximately 4% of total project cost. A study published in the journal Engineering, Technology and Applied Science Research found that design changes contribute to 56.5% of cost overruns and 40% of project delays.

At Custom Home, the design phase produces what we call a “Built Twice” outcome: the project is built first as a complete 3D digital model with every material specified by name, brand, and model number. You walk through the model, approve every detail, and receive a locked price before Phase 2 (construction) begins. The design fee credits toward the construction contract.

Common delays in this phase include indecision on floor plan direction, material selections requiring international supplier samples, and structural limitations discovered during site assessment. Start visiting showrooms and browsing materials before your design phase begins. The more prepared you are, the faster the process moves.

Phase 2: Permitting and Design Review (6 to 14 Weeks)

What Happens

Once the design is finalized, your contractor submits plans to the City of Los Altos for building permits. This is where Los Altos diverges from many Bay Area cities, because the city’s design review process adds a layer of approval that most homeowners do not encounter in neighboring communities.

Building permit plan review typically takes 4 to 8 weeks for residential projects. The Community Development Department reviews structural, electrical, plumbing, and mechanical plans for code compliance.

Design review is triggered when the project changes the exterior appearance of the home, adds floor area, increases building height, or alters the roofline. There are two tracks:

• Administrative/staff-level review: For smaller changes, including exterior alterations and additions up to 500 square feet. This typically adds 2 to 4 weeks.
• Zoning Administrator or Planning Commission review: For new two-story construction, one-story-to-two-story conversions, and larger projects. The Planning Commission meets twice monthly. This process, including story pole installation and public notification, can add 2 to 4 months.

Story poles are physical markers installed on the property to outline the proposed building envelope. They give neighbors and the Planning Commission a visual representation of how the project will look from the street and adjacent properties. Your contractor typically handles story pole installation and coordinates the required public notice period.

The Tree Protection Factor

Los Altos has a tree protection ordinance that can affect your construction timeline and site plan. Any tree 12 inches or greater in diameter at 48 inches above grade is protected (10 inches for native species). Removal requires a $300 permit and carries a $1,200 in-lieu fee if no replacement is planted. Removing a protected tree without approval is a misdemeanor.

If your renovation involves work near protected trees, you may need an arborist report and tree protection plan as part of your permit submittal. Your contractor should identify protected trees during the design phase and design the project to work around them.

What You Will Do

Your role during permitting is mostly waiting, but there are a few things to manage:

• Review and approve the final plan set before submittal
• Be available if the city requests plan revisions or additional documentation
• If Planning Commission review is required, attend the public hearing (your contractor should present the project, but your presence shows good faith)
• Begin finalizing temporary housing arrangements

What Can Delay This Phase

• Plan check corrections that require resubmittal (adds 2 to 4 weeks per cycle)
• Neighbor objections during the design review public comment period
• Tree protection issues that require redesigning the site plan
• Incomplete engineering documents (seismic, structural, or energy calculations)

Tip: A contractor with extensive Los Altos permit history knows what the city’s plan checkers look for and can prepare submittals that minimize revision cycles. Ask prospective contractors how many Los Altos permits they have pulled in the past three years.

Phase 3: Procurement (2 to 6 Weeks, Overlaps With Permitting)

While permits are under review, your contractor begins ordering materials with long lead times. This overlooked phase has an outsized impact on whether your construction timeline stays on track.

Materials that typically require early ordering: custom cabinetry (8 to 14 weeks), windows and specialty doors (8 to 16 weeks), natural stone and imported tile (6 to 12 weeks), and specialty appliances (4 to 12 weeks). If your contractor specified all materials during the design phase, procurement is straightforward. If materials were left as “allowances,” you need to finalize those choices now. Every week of delay in material selection is a week of potential construction delay later.

Phase 4: Demolition (1 to 2 Weeks)

What Happens

Demolition is when the project becomes real. Your contractor removes the interior finishes, fixtures, and systems that are being replaced. For a gut renovation, this means taking the home down to the studs and slab. For a mid-range remodel, demolition is more selective, targeting specific walls, rooms, or systems.

The demolition phase also serves as a diagnostic moment. When walls, ceilings, and floors are opened up, your contractor can see conditions that were hidden: the actual state of the framing, whether the plumbing is copper or galvanized steel, the condition of the electrical wiring, and whether there is asbestos in insulation, flooring, or pipe wrapping.

In Los Altos, where most homes were built between 1950 and 1975, discoveries during demolition are common. According to ACS data reported by Point2Homes, 66.1% of Los Altos housing units were built between 1950 and 1979, with a median year built of 1964. These homes are now 50 to 75 years old, and their original systems were not designed to last this long.

Common Discoveries in Los Altos Homes

• Galvanized steel plumbing. Common in 1950s and 1960s construction. The pipes corrode from the inside, restricting water flow and eventually leaking. Full repipe is the standard remedy.
• Knob-and-tube or aluminum wiring. Outdated electrical systems that do not meet current code and may present safety hazards. Full rewiring to 200-amp or 400-amp service is typical.
• Asbestos. Found in floor tiles, insulation, pipe wrapping, and some textured ceilings in homes built before 1980. Professional abatement is required before construction can proceed.
• Structural settling or damage. Cracked foundations, deteriorated mudsills, or termite damage in framing members. These require engineering evaluation and repair before new construction begins.

For gut renovations, the home is not habitable from this point forward. Budget a 10 to 15% contingency for discovery costs in older homes.

Phase 5: Structural and Framing (3 to 6 Weeks)

With demolition complete, the structural phase reshapes the home’s bones: foundation repair or reinforcement, wall removal and new header installation for open floor plans, new framing for additions and reconfigured rooms, subfloor repair, and window and door rough openings.

Structural work requires inspections from the City of Los Altos building department at specific milestones. Your contractor must pass each inspection before proceeding to the next phase.

This is your last opportunity to make spatial changes without significant cost impact. If your contractor offers a mid-construction walkthrough, take it. Seeing the framing in person before walls close helps you confirm that the spatial plan matches your expectations.

Phase 6: Rough-In (4 to 8 Weeks)

What Happens

Rough-in is when the mechanical systems go in behind the walls. Plumbing, electrical, and HVAC are installed before drywall closes everything up. This phase involves multiple trades working in sequence:

Plumbing rough-in runs new supply and drain lines to every fixture location. Electrical rough-in installs wiring for outlets, switches, lighting, dedicated appliance circuits, and low-voltage systems. Modern Los Altos renovations typically upgrade to 200-amp or 400-amp service. HVAC rough-in places ductwork, refrigerant lines, and equipment. Many 1950s-1960s Los Altos homes had radiant floor heating or wall furnaces that no longer meet comfort expectations; forced-air or mini-split systems are standard replacements. Insulation is installed per Title 24 energy code requirements.

The rough-in phase ends with city inspections. Plumbing, electrical, and mechanical systems must all pass before drywall can be installed.

Walk the site with your contractor after electrical rough-in and before drywall. It is far cheaper to move an outlet box now than after the walls are finished. Review outlet placement, switch locations, and low-voltage wiring against your 3D renderings to confirm alignment.

Phase 7: Finishes and Kitchen/Bath Completion (4 to 8 Weeks)

The finish phase is when the renovation starts looking like a home again. It is the longest, most labor-intensive phase, and it is where the quality of your contractor’s craftsmanship is most visible.

The sequence runs roughly as follows: drywall (1 to 2 weeks including dry time), painting, flooring installation, cabinetry and millwork, countertops (templated after cabinets are set, then fabricated and installed over 2 to 3 weeks), tile, plumbing fixture installation, appliance connection, glass enclosures, and hardware.

Cabinetry delivery is the critical-path item. A delay in cabinet delivery stalls kitchen countertop templating, which stalls backsplash, which stalls fixture installation. This is why ordering long-lead materials during the permitting phase matters so much.

Visit the site regularly during this phase. Flag finish quality concerns early, because corrections are easier before adjacent work proceeds. Verify that installed fixtures and appliances match the models specified in your scope document.

Phase 8: Punch List and Completion (2 to 4 Weeks)

The punch list is a systematic walkthrough to identify items that need correction: paint touch-ups, cabinet door alignment, grout refinement, caulking, hardware adjustments, and mechanical system calibration. A thorough walkthrough takes 2 to 3 hours for a whole-home renovation.

The City of Los Altos conducts a final building inspection to confirm that all permitted work meets code. Do not make your final payment until you have written confirmation that all inspections have passed and you have received your Certificate of Occupancy.

Walk every room with your contractor and test every fixture, outlet, switch, appliance, and door. Review the completed project against your original 3D renderings and scope document. Retain 10% of the final payment until punch list items are resolved (standard industry practice). Collect warranty documentation, maintenance guidelines, and as-built drawings.

Living Arrangements During Renovation

For a gut renovation, plan to live off-site for the entire construction duration. The home will lack functional plumbing, electrical, and HVAC for most of the construction timeline, and dust from demolition, drywall, and finish work is a health concern.

Temporary housing costs in Los Altos. Short-term furnished rentals and extended-stay housing in the Los Altos and Mountain View area run $3,500 to $6,500 per month in 2026. For a 9-to-14-month gut renovation, that adds $31,500 to $91,000 to your total project cost. Most families opt for short-term furnished apartments or nearby rentals on month-to-month leases. Budget an additional $200 to $400 per month for portable storage containers.

For mid-range remodels phased room by room, living in the home during construction is sometimes possible. Discuss this with your contractor during the design phase. Most homeowners who attempt it wish they had moved out.

A Realistic Timeline Summary

Here is how the phases add up for a typical Los Altos gut renovation of a 2,200-square-foot home:

Phase	Duration	Running Total
Design development	6-10 weeks	6-10 weeks
Permitting + design review	6-14 weeks	12-24 weeks
Procurement (overlaps with permitting)	2-6 weeks	12-24 weeks
Demolition	1-2 weeks	13-26 weeks
Structural/framing	3-6 weeks	16-32 weeks
Rough-in	4-8 weeks	20-40 weeks
Finishes + kitchen/bath	4-8 weeks	24-48 weeks
Punch list	2-4 weeks	26-52 weeks

Total: approximately 6 to 12 months of construction, plus 3 to 6 months of pre-construction.

The wide range reflects real variability. A straightforward renovation of a 1960s ranch with staff-level design review can move through permitting in 8 weeks. A project that requires Planning Commission approval, involves protected trees, and sources specialty materials internationally may spend 20+ weeks in pre-construction before a single wall comes down.

What Sets Los Altos Renovation Timelines Apart

Several factors make Los Altos renovations take longer than comparable projects in cities with less involved review processes:

Design review. Cities like Sunnyvale and Mountain View process residential permits with fewer design review touchpoints. Los Altos timelines are inherently longer for projects that change the exterior.

Housing stock age. With 66.1% of homes built between 1950 and 1979 (according to ACS data via Point2Homes), discovery work during demolition is more common here than in cities with newer stock.

Homeowner expectations. Los Altos is a premium market where median home prices exceed $4 million (according to Palo Alto Online, citing DeLeon Realty data from 2025). Homeowners investing $500,000 to $1 million expect exacting standards for materials and craftsmanship, which takes more time.

Contractor demand. According to the Associated Builders and Contractors, the construction industry needs 439,000 new workers nationally in 2025. In Los Altos, the best contractors book 3 to 6 months in advance.

How to Keep Your Renovation on Track

Based on common patterns across Bay Area whole-home renovations, these practices help minimize delays:

Finalize all design decisions before construction. Make every material, layout, and finish decision during the design phase. Custom Home’s Phase 1 design process locks in every selection before Phase 2 construction begins.

Order long-lead materials early. Identify materials with lead times exceeding 8 weeks and place orders during the permitting phase, not after permits are issued.

Build in contingency. Budget 10 to 15% for unexpected conditions in homes built before 1980. Build 2 to 4 weeks of schedule contingency into your temporary housing lease.

Choose a contractor with Los Altos experience. Local experience with the city’s permitting staff and design review process reduces avoidable delays. See our high-end contractor selection guide for Los Altos.

Communicate regularly. Establish a weekly check-in schedule with your project manager from day one.

Ready to Plan Your Timeline?

A whole-home renovation in Los Altos is a significant undertaking, but it does not have to be unpredictable. The homeowners who have the best experience are the ones who invest in a thorough design phase, choose a contractor with local expertise, and plan realistically for the timeline.

Custom Home has been delivering home remodeling projects across the Bay Area since 2005, with over 100 completed projects. Our two-phase design-build process ensures that every decision is made, every material is specified, and every cost is locked before construction begins.

Contact us for a free consultation to discuss your Los Altos renovation timeline. We will walk through your project’s scope, give you a realistic timeframe, and help you plan for each phase from design through move-in day.