City guide / Marin County
Title 24 planning in Corte Madera
Preparation guidance for energy compliance documentation in Corte Madera, California. Remote statewide service; local requirements come from your building department.
Hypothetical example / Corte Madera
An addition with adjoining alterations: define the affected area first
ILLUSTRATIVE ONLY: a homeowner proposes a 420 sq ft addition and alterations to adjoining rooms. The applicant does not assume that the addition’s number alone determines whether a local provision applies. The architect marks the new and altered areas separately and asks Corte Madera how the ordinance’s scope and area definition apply. The consultant then evaluates the confirmed project boundary and supported envelope/system inputs. This is a preparation example, not a ruling that the separate areas must be combined or may be ignored. The City must resolve the actual applicability question before final documentation relies on it.
Illustrative scenario only; not a statement about local projects, climate or permit rules.
Scenario checklist
- Mark added and altered areas separately
- Confirm how the City applies the listed area topic
- Document existing versus proposed assemblies and systems
- Keep local scope decisions with the permit record
Corte Madera: do not confuse addition size with the complete work scope
Project-preparation guidance, not a statement of local requirements. Confirm applicability with your project team and reviewing agency.
What the CEC lists for Ordinance 1048
The CEC’s approved-local-ordinances page for the 2025 Energy Code, checked November 6, 2026, records approval of Corte Madera Ordinance 1048 on February 11, 2026. Its listed topic is efficiency improvements for single-family additions and alterations greater than or equal to 500 square feet. The summary identifies the building/scope category and area topic; it does not explain every measurement rule, exception or required improvement. Cite that limited statement accurately rather than turning it into a universal checklist for every residential or commercial permit.
Ask for an area interpretation before relying on a threshold
Existing floor area, added conditioned floor area and the area of altered rooms are different pieces of project information. Provide all relevant quantities and ask the reviewing City department which definition and scope it needs. Do not infer a method for combining work from the CEC summary. A CEC approval date is also not automatically the City’s effective date or the date controlling this application. Confirm application treatment and the local layer separately, and retain the City’s direction with the drawings.
Prepare plans that show the boundary—not just a total
For an addition/alteration request, make the changed work visible on the architectural set. Use consistent labels for existing retained space, added conditioned space and altered existing space. Describe what happens to walls, roofs, windows and systems in each category. A preparer cannot select a defensible modeling boundary from a cover-sheet total if the drawings leave those distinctions unclear.
- Supply existing and proposed floor plans with dimensions, scope labels and area calculations prepared by the designer; identify any City interpretation already received.
- Provide elevations/sections and the window/door schedule with U-factor/SHGC, dimensions and retained-versus-replaced openings; label unresolved product selections.
- Identify assemblies and insulation, existing-condition evidence and proposed HVAC/water-heating changes, including which spaces the systems serve.
- Include the recorded application date, prior reports, complete comments and a change summary; distinguish preliminary option studies from the requested permit package.
Use the example to ask a better question
In the 420 sq ft illustrative addition, the adjoining alterations are not erased from the scope simply because the addition is smaller than the listed 500 sq ft topic. Equally, this page does not declare that all areas must be added together. Ask the City how the proposed work is evaluated under Ordinance 1048 and record the answer. The energy preparer should not have to invent that interpretation to finish an early quote.
Once the basis is confirmed, the designer and preparer can compare supported envelope/system choices and the appropriate addition or alteration pathway. If optional whole-house analysis is requested, identify it separately from the permit scope. An early model can inform design decisions without being mislabeled as a final compliance package.
Energy modeling and boundariesAddition and alteration support
Classify an ADU or conversion before selecting forms
A new detached dwelling, attached addition and garage conversion are not interchangeable energy scopes. Record previous conditioning, proposed dwelling boundaries and impacts on the original house. The CEC’s listed single-family addition/alteration topic does not by itself decide how a particular ADU is classified or what local provisions apply. Confirm that basis with the City and project designers rather than treating the ADU name as an exemption.
Commercial tenant work likewise needs its applicable nonresidential scope review; do not extend a single-family area summary to a shop or office without authority. Keep the relevant report family and construction-stage responsibilities distinct instead of attaching the same certificate to every project type.
ADU and garage-conversion documentationCommercial TI documentation
Confirm the edition and the construction handoff
Statewide 2025 California Energy Code guidance generally follows permit applications on or after January 1, 2026. Ask the AHJ to confirm the recorded application date and treatment of later changes or refiling. Use matching forms/software. A drawing date, construction start or local approval-list date is not a substitute.
Where the single-family family applies, CF1R documents design compliance; installers complete applicable CF2R; qualified ECC-Raters complete required CF3R verification. ECC is current terminology, while HERS may remain on older-cycle records. Design preparation does not perform those field responsibilities. Plan for required evidence before affected work is concealed.
Application-date guideCF1R and separate field responsibilities
Request a coordinated report or correction
Send the report/drawings actually reviewed and complete numbered comments if this is a correction. Identify a missing explanation separately from later design changes. Title 24 Lab serves Corte Madera remotely, without a local office or agency affiliation. Use published square-footage pricing and scope review; no local fee or timeline is invented here. Field testing, acceptance testing, registry fees, CALGreen and permit fees are separate. This is educational information, not legal advice or a permit guarantee.
Plan-check correctionsPricingGet a QuoteMarin County guideSan Rafael guide
Checklist for Corte Madera
- 01Identify which agency reviews permits for your Corte Madera parcel (city, county or other).
- 02Confirm the building climate zone for the exact address using the CEC tool.
- 03Ask which Energy Code cycle applies to your application date.
- 04Ask whether local amendments or reach codes apply to your scope.
- 05Ask how energy forms should be included: on plan sheets, uploaded separately, or both.
County guide: another example
Remodel where electrification rules may apply
Read the Marin County guideQuestions
What local topic does the CEC list for Corte Madera?
Ordinance 1048, approved February 11, 2026, is listed for efficiency improvements to single-family additions/alterations greater than or equal to 500 square feet. Confirm the complete applicable requirements with the City.
Can I decide applicability from the addition’s area alone?
Do not assume so when other alteration work is proposed. Supply separately labeled areas and ask the City how it evaluates the actual scope. This guide does not define aggregation, measurement rules or exceptions.
Does a garage conversion automatically follow the addition example?
No. Existing conditioning, dwelling classification and the proposed work matter. Provide existing/proposed plans and ask the project team and City to confirm the appropriate path before reusing an addition model.
Can the preliminary option study be the permit report?
Only coordinated final documentation should be relied on for submission, with confirmed inputs, the applicable basis and required declarations/registration. Label unresolved assumptions and reconcile the report with the named drawing revision.
Do you have an office in Corte Madera?
No. Service is remote and statewide; this page is a planning guide.
Where do I confirm Corte Madera requirements?
With the building department that reviews your permit. Many incorporated cities run their own; confirm whether Corte Madera or Marin County reviews your parcel.
How to use the official resources
Government links below are starting points for identifying the authority for the actual property and scope. They are not evidence of an affiliation, an office or approval of this service. Start at Corte Madera’s city site for city department navigation; the county link provides separate county context.
The CEC climate tool supports a location-specific lookup; this guide assigns no climate zone. The CEC Energy Code Support Center separates edition-specific forms and building categories. Confirm the applicable edition, document family and any registration or verification requirements before using a form.
CEC Energy Code Support Center: forms, FAQs and trainingNext step
Preparing a project in Corte Madera?
Published flat pricing from $149 residential and $399 commercial. Upload plans privately; no payment is taken online.