Adobe House Atlas A Field Catalog
Key № ID-01 Field tool
For homeowners & renovators

Is My House Adobe?

A visual identification key for homeowners and renovators.

This tool walks through eight questions that catalog researchers use when assessing an unfamiliar property — wall thickness at the window reveal, the way corners are formed, the surface texture of the plaster, the roof profile, the presence or absence of canales, the decade the house was built, the region it sits in, and the construction system at the base course.

It is a likelihood guide, not a structural inspection. A confident result still calls for a professional assessment before any significant work. Use it the way a field guide is used: to narrow the possibilities, to know what to look for next, and to ask better questions of the architect or engineer who eventually walks the building with you.

Eight visual questions

The identification key

Jump to your result →

Begin at Key 1. Answer each question with the closest match.

Each answer carries a weight toward one of three terminal results. Strong adobe markers count heaviest; secondary markers narrow the range. Your answers stay in your browser; the URL updates so you can share or bookmark an answer set.

Key 1 of 8 · Walls

How thick are the exterior walls at a window or doorway?

Measure the reveal
Surface & form
Key 2 of 8 · Corners

How rounded are the wall corners and window openings?

Look outside & in
Key 3 of 8 · Surface

What does the exterior plaster surface read like at arm's length?

Texture & sheen
Roof & structure
Key 4 of 8 · Roof

What is the dominant roof form?

Look from the street
Key 5 of 8 · Ceiling beams

Are round timber roof beams (vigas) visible inside or out?

Look up
Key 6 of 8 · Drainage

Are there exposed canales — wooden drain spouts through the parapet?

Especially on flat roofs
Where & when
Key 7 of 8 · Region

Where is the house?

Region of the country
Key 8 of 8 · Age

When was the house built, by the assessor's record?

County records, deed

Once you have answered all eight, the verdict panel will reveal below — and the URL will hold your answer set so you can share or bookmark it.

0 / 24 adobe pts Read your result →
Reading the result

Three likely outcomes

Probably adobe

True adobe, likely 19th- or early-20th-century

You are reading walls between roughly 12 and 24 inches deep, with hand-formed corners, a soft plaster surface, a flat or low parapet roof, and a documented construction date before 1940 in an adobe region. Treat the house as a historic earthen building from this point forward.

Next steps: request a no-cost referral from your State Historic Preservation Office; commission a moisture and plaster condition survey from a preservation architect before any re-finishing work; read the Spanish Colonial and Pueblo Revival field guides.

Read the Spanish Colonial field guide →
Likely adobe-style stucco-on-frame

A revival-era imitation of the adobe form

You are reading thinner walls — usually under 12 inches — with bullnose plaster, applied beams, scuppers in place of canales, and a build date between roughly 1920 and 1970. The house belongs to the long Pueblo and Mission Revival lineage; the look is genuine but the wall system is conventional frame.

Next steps: care for it as you would any stucco-clad frame house, but preserve the revival detailing — applied vigas, parapets, and scuppers — that gives the type its character. The Pueblo Revival field guide covers what is original versus added.

Read the revival field guide →
Unlikely adobe

Conventional wood-frame or masonry construction

You are reading square corners, even sand-float stucco or siding, a pitched shingle roof, no vigas or canales, and a build date after 1970 outside the historic adobe regions. The house is almost certainly framed in wood or built of concrete block; the look may borrow Southwestern motifs without sharing the wall system.

Next steps: for renovation guidance follow standard residential building practice for your climate zone. If you are drawn to adobe, the Modern Adobe guide covers what new-build earthen construction involves today.

Read the modern adobe guide →
Follow-up questions

Common follow-ups

All guides →

Why does it matter whether my house is true adobe?

True adobe and adobe-style stucco-on-frame behave differently. True adobe walls store and release heat through thermal mass, need lime or earthen plasters that breathe, and require maintenance of their plaster coats, canales, and base courses. A stucco-on-frame house looks similar from the curb but performs like any wood-frame house and accepts standard cement stucco, vapor barriers, and insulation. Misidentifying the system leads to trapped moisture, cracked walls, and avoidable repair costs.

What if my walls are thick but I am not sure they are adobe?

Wall thickness alone is not diagnostic. Stone, rammed earth, double-wythe brick, and concrete-block-with-furring can all measure two feet or more at the window reveal. Look for the combination of thickness, soft hand-formed corners, a slightly undulating plaster surface, exposed timber vigas at the roof line, and a documented construction date before about 1940 in a historically adobe region. Two or three of those features together raise the likelihood substantially.

Should I get a professional assessment before renovating?

Yes. This identifier is a likelihood guide, not a structural inspection. Before any significant work — re-plastering, removing interior finishes, adding a window, or altering the roof — engage a preservation architect or a structural engineer with documented adobe experience. State Historic Preservation Offices maintain referral lists. A two-hour site visit usually costs less than one misjudged renovation choice.

Can a house be partly adobe?

Frequently. Older Southwestern houses were enlarged room by room over decades, often starting as a small adobe core with later frame, brick, or concrete-block additions. It is common to find a 1790s adobe parlor wing joined to a 1920s wood-frame bedroom wing under a single roof. The identifier reflects the dominant wall system; consult a professional for a room-by-room assessment if the building reads as mixed.