An Eichler remodel is different from a typical South Bay remodel because the house itself is different: post-and-beam framing, flat or low-sloped roofs with exposed beams, walls of glass, and a concrete slab that often carries radiant heating. In some cities, exterior changes also go through Eichler-specific design rules. Plan the systems (heat, roof, windows, wiring) and the city review together, before you pick finishes.
This guide covers what makes an Eichler different, the upgrades owners ask about most and where they go wrong, and the Eichler rules in San Jose, Sunnyvale, Cupertino and Palo Alto, each checked against the city’s own documents.
What makes a house an Eichler?
Eichlers are the mid-century modern tract homes built by Joseph Eichler’s company from the late 1940s. Sunnyvale’s Eichler Design Guidelines say Eichler built around 11,000 production homes in Northern and Southern California, with over 1,000 of them in Sunnyvale between 1949 and 1972. So yes, Eichlers are mid-century modern, and the South Bay and Peninsula hold some of the largest groups of them: Sunnyvale alone has more than 1,000.
The same city document lists the features that define the style. The ones that matter most for a remodel:
- Post-and-beam construction. The roof sits on a grid of posts and beams, not on conventional stud walls. That is what allows the big openings.
- Flat and low-pitched roofs with wide overhangs, exposed beams inside and out, and tongue-and-groove roof decking. There is usually no attic.
- Large areas of glass facing the private yard, often floor-to-ceiling, and a fairly solid wall toward the street.
- Interior and entry atriums, open courtyards in the middle of the plan.
- Slab-on-grade construction with radiant floor heating embedded in the slab.
Palo Alto’s adopted Eichler Neighborhood Design Guidelines add that walls often have mahogany paneling, and they summarize the maintenance complaints owners share: flat roofs that can leak, no crawl space under the floor, single-pane glass, little insulation, inefficient radiant heat and nonstandard siding. Nearly every Eichler project touches at least one of those.
Why an Eichler remodel is different from a standard remodel
In a typical 1950s or 1960s ranch house in San Jose, pipes, ducts and wires hide in the attic, the crawl space and the stud walls. An Eichler has little of that hidden space. The ceiling is the underside of the roof, the floor is a slab, and many walls are glass. So the questions that are routine elsewhere (“where does the duct go?”, “how do we get a new circuit to the island?”) need an answer during design, not in the middle of demolition.
The other difference is appearance. The things that make an Eichler valuable to its owner (the low profile, the clean roofline, the glass) are the same things a careless remodel can undo. Sunnyvale’s guidelines put it plainly: improvements and additions should look as if they were built with the original house. If you are planning broader updates to an older home, our guide to remodeling ideas for older homes covers the general sequence; the sections below cover what is specific to Eichlers.
Common Eichler upgrades and their pitfalls
Radiant floor heat vs. a new heating system
Many Eichlers still rely on the original radiant system in the slab. Sunnyvale’s guidelines note that radiant floors built when copper piping was not available often deteriorated, and that wall and roof insulation was often minimal, which is why many owners want to upgrade heating and cooling.
There is no single right answer here, and the condition of your existing system matters more than any rule of thumb. Get it evaluated by a qualified HVAC or radiant specialist before you decide to repair, replace or abandon it. What the City of Sunnyvale does say is that standard ducted systems can hurt the look of the house when ducts and equipment end up on the roof. Its guidelines suggest considering alternatives such as ductless mini-split heat pumps, individual room heat pumps, small-duct high-velocity systems, plastic-tubing radiant heating or baseboard heaters, and concealing supply ducts inside the house where possible.
The pitfall: choosing a system based on price alone and then discovering it needs rooftop ducts that the city (or you) will not like, or a bigger electrical service than you have.
Roof insulation and re-roofing
Because there is usually no attic, an Eichler cannot simply get blown-in insulation. Insulation is often added above the roof deck, which is why re-roofing and insulating tend to be planned as one project. Sunnyvale’s guidelines flag exposed views of foam roofing, rooftop equipment and ducts, and large solar panels that dominate the house form as common concerns, and they encourage integrating utility elements like solar panels and ducts into the roof form.
The pitfall: treating the roof as a separate job. If you plan solar, new HVAC or skylights in the next few years, decide on them before you re-roof so penetrations and supports are handled once. Ask your roofer how the added thickness will look at the fascia and edges, since that thin roof edge is part of the Eichler look.
Windows and glass walls
Single-pane glass is one of the most common complaints, and the city documents list window upgrades among the main Eichler challenges. Sunnyvale’s guidelines describe the original detail (single glass held against wood posts with trim) and note that narrow aluminum-frame windows or insulated glass set in similar trim can keep the look.
Code rules apply too. Sunnyvale’s Eichler Window Replacement handout covers like-for-like replacements only; changing the size or location of a window requires Planning approval. Based on the 2025 California codes, it says replacement windows and sliding doors of 75 square feet or less need a maximum U-factor of 0.40 and a maximum solar heat gain coefficient of 0.35, and it lists tempered-glass locations and bedroom egress rules. Other cities apply the same state codes through their own permits.
The pitfall: ordering standard vinyl windows with thick frames. They meet the energy code but change the proportions of the glass walls, which is exactly what design review looks at in cities with Eichler rules.
Kitchens in a post-and-beam house
An Eichler kitchen remodel usually means working with an open plan that already exists. The kitchen and family room were combined in the original design, which Sunnyvale’s guidelines call a trend setter. What makes these kitchens harder is routing: a new range hood needs a path out through a roof you may have just re-roofed, and island outlets or plumbing may mean cutting the slab (and working around radiant tubing if it is still active).
Remove or move a wall only after someone confirms whether it carries a beam or provides bracing. In a post-and-beam house, the “wall” may be infill between posts, or it may be doing structural work. Our open-concept remodeling page explains how we check this before any demolition.
For budgeting, our current guidance for most full kitchen remodels is $50,000 to $80,000. Eichler-specific items such as slab work or venting through the roof can push a project toward the top of that range or beyond, so ask for them to be priced separately.
Eichler bathroom remodels in San Jose and nearby
Bathrooms in an Eichler sit on the slab, so moving a toilet or shower drain means cutting concrete, and radiant tubing in the slab has to be located first if it is still in use. Many Eichler baths are also small and have clerestory or high windows. The typical ranges we see for a bathroom remodel in San Jose run from $15,000 for small updates to $60,000 and up for upscale renovations. Keeping fixtures in their current locations is the simplest way to stay near the lower end.
Interior work like this is generally not reviewed under Eichler design rules (see the city section below), but it still needs normal building permits.
Electrical upgrades
Heat pumps, induction cooking, EV chargers and solar all add electrical load, so an Eichler upgrade plan often leads to a question about the main panel and service. There is no one answer; a licensed electrician should do a load calculation for your house. The Eichler-specific issue is routing: with no attic and a slab floor, new circuits may run through the roof insulation layer, in surface raceways, or through walls that are opened for other work. Plan wiring at the same time as the roof and HVAC so you open things up once.
Additions, second stories and atriums
Additions are where the city rules bite hardest. Some neighborhoods allow second stories and some do not (see the table below). A ground-floor room addition is often the more natural fit for an Eichler, and in single-story overlay areas it is the only way to add space. Our current guidance for room additions is $300 to $600 per square foot, and $300 to $500 or more per square foot for a second-story addition where one is allowed. Sunnyvale’s guidelines also cover enclosing an atrium, and note that Eichlers, with their glass walls, are especially sensitive to privacy impacts from neighboring two-story homes.
Eichler design guidelines by city
Eichler rules are local, and they apply mainly to exterior changes. Here is a summary, with each point taken from the city’s own website or adopted document.
| City | Eichler rule or document | Where it applies | Second stories |
|---|---|---|---|
| San Jose | Eichler Neighborhood Objective Design Standards | Exterior changes needing a Single Family House Permit or other Planning permit with historic review; currently only the Fairglen Additions historic district | Reviewed under the standards in Fairglen Additions; normal zoning rules elsewhere |
| Sunnyvale | Eichler Design Guidelines, adopted July 28, 2009 | All homes in Eichler neighborhoods; exteriors visible from the street and neighbors, not interiors | Allowed, except where zoned Single-Story (S) Combining District |
| Cupertino | R1-e (Eichler) zoning district and the Eichler Design Handbook | A small area where Eichler is the predominant style | Per the R1 Ordinance’s Eichler building design requirements; single-story overlay (R1-i) areas limit homes to one story and 18 feet |
| Palo Alto | Eichler Neighborhood Design Guidelines, adopted April 2, 2018 (voluntary) | Eichler tracts across the city; advisory unless the Council adopts zoning changes | Not allowed in Single Story Overlay districts (17-foot height limit, one habitable floor) |
San Jose
According to the City’s Eichler Neighborhood Objective Design Standards page, San Jose has seven residential tracts built by Eichler Homes that form five neighborhoods: Morepark (1952 to 1953), Fairglen (1957 to 1959), Fairglen Additions (1959 to 1961), Hudson (1961 to 1963) and Fairhaven (1961 to 1963).
The standards cover exterior changes to Eichler houses on the Historic Resources Inventory that require a Single Family House Permit or another Planning permit involving historic review. The City says they currently apply only in the Fairglen Additions historic district, a National Register district, but could apply later to other Eichler tracts that are designated as historic districts. They mix required standards (“shall”, “must”) with optional guidance (“should”). If your Eichler is in Morepark, Fairglen, Hudson or Fairhaven, check with Planning, since the scope could change. More on San Jose permits is on our San Jose remodeling page.
Sunnyvale
Sunnyvale adopted its Eichler Design Guidelines on July 28, 2009, because its general single-family guidelines fit traditional houses better. They replace those guidelines for all homes in Eichler neighborhoods, focus on exteriors visible from the street and neighbors, and do not apply to interior improvements. Design review is required for things like a floor-area increase of 20% or more of the existing house, or adding any second-story component, including balconies. Second floors are allowed in all Eichler neighborhoods except those zoned with the Single-Story (S) Combining District, which neighborhoods can petition for. The guidelines are listed on the City’s Design Guidelines and Standards page. See also our Sunnyvale remodeling page.
Cupertino
The City of Cupertino’s single-family residential page describes R1-e as the Eichler single-family zoning district: a small area where the predominant style is Eichler, governed by the Eichler Building Design Requirements in the R1 Ordinance. The City also developed an Eichler Design Handbook with residents of the neighborhood to help owners preserve the style. Separately, R1-i single-story overlay areas limit homes to one story and 18 feet. Our Cupertino page covers the wider permit process.
Palo Alto
Palo Alto adopted its Eichler Neighborhood Design Guidelines on April 2, 2018 (Resolution No. 9748). The document says they are voluntary and advisory unless the City Council adopts zoning changes to require them, and that they do not affect Single Story Overlay (SSO) zoning. At adoption, SSO districts overlapped eleven Eichler tracts. In an SSO district, the maximum height is 17 feet to the roof peak (a little more in special flood hazard areas) with one habitable floor. Neighborhoods can apply for SSO rezoning with evidence of 70% owner support, or 60% where CC&Rs already limit homes to one story. Our Palo Alto page has more on local permits.
In what order should you remodel an Eichler?
A general rule for any remodel is structure and systems first, finishes last. For an Eichler, that looks like this:
- Confirm the rules. Find out whether your address is in an Eichler district, historic district or single-story overlay before designing anything on the exterior.
- Assess the envelope and systems. Roof condition, radiant system condition, electrical capacity and window condition.
- Decide on heating and cooling, because that choice drives roof penetrations, electrical load and sometimes slab work.
- Re-roof and insulate with solar, HVAC and skylight plans already set.
- Windows and glass walls.
- Kitchens, baths and interior finishes.
Doing the kitchen first and the roof two years later is the most common way owners end up paying to open the same areas twice. Our home remodel checklist walks through planning steps that apply to any project.
The biggest Eichler remodeling mistakes
- Designing the exterior before checking the city. A second story drawn for a single-story overlay lot wastes design fees.
- Putting ducts and equipment on the roof without a plan. Cities with Eichler guidelines specifically call this out.
- Heavy window frames that change the glass proportions.
- Removing a wall without a structural check. In post-and-beam framing, the load path is not always where you expect it.
- Cutting the slab without locating radiant tubing that may still be in use.
- Hiring someone who has never worked on an Eichler. Sunnyvale’s guidelines strongly encourage using designers, contractors and suppliers experienced with Eichler construction.
Frequently Asked Questions
Do Eichler design guidelines apply to interior remodels?
Generally, no. Sunnyvale’s guidelines state that they do not apply to interior improvements, and San Jose’s standards cover exterior changes. Interior kitchen and bath work still needs regular building permits.
Can I add a second story to my Eichler?
It depends on the city and neighborhood. Sunnyvale allows second floors except in the Single-Story (S) Combining District. Palo Alto’s Single Story Overlay districts limit homes to one habitable floor, and Cupertino’s R1-i overlay limits homes to one story and 18 feet.
Which San Jose Eichler neighborhoods have design standards?
San Jose’s Eichler Neighborhood Objective Design Standards currently apply only to the Fairglen Additions historic district, according to the City. The other Eichler neighborhoods are Morepark, Fairglen, Hudson and Fairhaven.
Should I keep my Eichler’s radiant floor heating?
That depends on the condition of your system, so have it evaluated first. Sunnyvale’s guidelines note that many owners upgrade and list alternatives, including ductless mini-splits and small-duct systems, that avoid rooftop ducts.
How much does an Eichler kitchen remodel cost?
Our current guidance for most full kitchen remodels is $50,000 to $80,000. Slab work, roof venting and electrical upgrades specific to Eichlers can add to that, so price them as separate line items.
Planning an Eichler remodel in the South Bay?
Brother & Brother Builders is a family-owned general contractor (CSLB #887389) based on Stevens Creek Blvd in San Jose, and we have handled more than 1,000 projects since 2006. We do design, 3D renderings and permits in-house, which helps when a project has to clear Eichler rules. If you would like to talk through your house, contact us.
