Remodeling an Eichler in San Jose: What Works, What Breaks, What It Costs

San Jose has several Eichler tracts, concentrated in Fairglen, Fairhaven and around Willow Glen. They are excellent houses and difficult ones, and remodeling them requires knowing which of their features are constraints and which are the whole point.

The mistake that ruins Eichlers is treating them as ordinary 1950s houses with unusual ceilings. Nearly everything about how they are built is different.

What it costs

The radiant slab is the central constraint

Eichlers are heated by hot water circulating through tubing embedded in the concrete slab. Most of the original systems used steel or copper tubing that is now 65 to 70 years old.

Three consequences:

1. You cannot cut the slab casually. Moving a sink, a toilet or a shower drain means cutting concrete that has heating tubing in it, and the as-built drawings for these tracts are frequently unavailable or inaccurate. Cutting a tube means the system loses pressure and the repair means opening more concrete.

Ground-penetrating radar or thermal imaging to map the tubing before cutting: $1,500 to $4,500. This is not optional on an Eichler. It is the cheapest insurance available on the whole project.

2. The system may already be failing. Original steel tubing corrodes from the inside. Symptoms are zones that no longer heat, pressure that drops, or a boiler running continuously.

The topping slab option preserves the radiant heating, which is genuinely the most comfortable heat there is, but it raises the floor by an inch and a half to two inches, which affects every door, every threshold and the relationship to the glass walls. It is the purist option and it is expensive.

3. Floor finishes have to work with radiant. Thick insulating floor coverings defeat the system. Tile, polished concrete and thin engineered wood work; thick carpet with a heavy pad does not.

No attic, no crawlspace, nowhere to hide anything

An Eichler roof is a low-slope structure over exposed beams with tongue-and-groove decking. There is no attic. The floor is slab on grade, so there is no crawlspace. Everything that a conventional house hides above or below has nowhere to go.

What that means in practice:

• New electrical circuits have to be surface-run in conduit, chased into walls, or routed through the roof assembly during a re-roof. Adding a kitchen circuit is a design problem, not just an electrical one. $3,500 to $12,000 for a kitchen’s worth.
• Recessed lighting is difficult or impossible in the beamed areas. Lighting design in an Eichler works with the architecture: track on the beams, pendants, cove lighting at the perimeter, uplighting. Fighting it with recessed cans requires furring down the ceiling, which destroys the thing you bought.
• Ductwork for forced air has to run in a soffit, in a dropped ceiling in the hallway, or through the roof. This is the main reason mini-splits are so common in remodeled Eichlers.
• Plumbing vents penetrate the roof, and roof penetrations on a low-slope Eichler roof are the primary source of leaks. Every new vent is a permanent maintenance item.
• Range hood ducting is a genuine design challenge and one of the first things to solve in an Eichler kitchen.

The glass walls

Floor-to-ceiling single-glazed glass is the defining feature and the largest energy problem. Upgrading it is the highest-value and highest-cost item in an Eichler remodel.

The specification that matters is frame sightline width. An Eichler glass wall works because the frames nearly disappear. A replacement system with frames twice as wide performs correctly and looks wrong, and that is not recoverable. Pay for the slim profile.

Title 24 applies to replacement glazing, which is a reason the correct thermally broken system is required rather than optional.

The roof

Low-slope, minimally insulated, and with the structure exposed inside, which means insulation can only be added above the deck. A re-roof is therefore the one opportunity to fix the thermal performance of the whole house.

• New roofing membrane: $24,000 to $45,000
• Rigid insulation above the deck: $12,000 to $28,000
• Consequence: the roof gets 3 to 6 inches thicker, which changes the fascia and the relationship to the glass walls, and needs detailing rather than being an afterthought
• Opportunity: this is the moment to run any electrical or mechanical you will ever want in the roof assembly

An Eichler re-roof without adding insulation is a missed opportunity that will not come again for 25 years.

What to preserve and what to change

Preserve: the exposed beams and decking, the glass walls and their sightlines, the atrium, the open plan, and the relationship between inside and outside. These are the house.

Change freely: kitchens, bathrooms, the original single-pane glass performance, the electrical system, insulation, and the original bathroom layouts, which are genuinely too small.

Think hard before changing: enclosing the atrium, which is often the first thing owners consider and usually the thing they later regret; dropping ceilings to hide mechanical, which trades the defining feature for convenience; and adding a second storey, which is structurally possible and almost always wrong on these houses.

Permits and process

Permits go through San Jose Permit Center at 200 East Santa Clara Street. Eichler remodels are ordinary permits, with two additions:

• Structural detail for any change to the post-and-beam system. These houses have less redundancy than conventional framing, and removing or altering a post is a real structural change, not a minor one.
• Title 24 on glazing and insulation, which is where the performance path matters most, since an Eichler with large glass areas needs trade-offs to comply.

Some Eichler tracts have active neighborhood associations with design guidelines. These are generally advisory rather than binding, but they are worth reading, and neighbours in these tracts pay attention.

How long does it take?

A kitchen runs 5 to 8 months elapsed. A whole-house remodel runs 14 to 24 months. Both are longer than the conventional equivalent, for three reasons: the slab has to be mapped before anything is cut, the mechanical and electrical routing requires design rather than execution, and slim-profile glazing systems are made to order with long lead times.

Getting a real number

An honest Eichler estimate needs four things established before pricing: the condition of the radiant system, a map of the tubing wherever the slab might be cut, the state of the roof and whether a re-roof is in scope, and a decision on the glass. Every one of those is a five-figure fork, and none of them can be guessed from a walkthrough.

DevArt8 Builders remodels homes throughout San Jose including the Fairglen and Willow Glen Eichler tracts, and maps the slab and radiant system before any plumbing or structural work is priced. See our full home remodeling in San Jose page for project detail.