Room Addition Architect and Structural Engineer in Los Angeles

Architectural Plans, Structural Design & Permit Documents

our rating

YEARS EXPERIENCE

PROJECTS

HAVE A PROJECT TO DISCUSS?

Name

Phone

Project Location

Message

SMS Consent

By checking this box, I consent to receive conversational SMS messages from STEN Engineering related to my inquiry, appointment, consultation, or project

Reply STOP to opt out. Reply HELP for support. Message & data rates may apply. Messaging frequency may vary. Visit our Privacy Policy to see our privacy policy and Terms of Service for our Terms of Service.

Architectural and Structural Plans for Room Additions

STEN Engineering prepares coordinated architectural and structural plans for residential room additions in Los Angeles and nearby communities. A coordinated design helps the new space connect with the existing floor plan, exterior, roof, and structural framing.

Depending on the property and confirmed scope, the work may include floor plans, elevations, sections, structural framing plans, connection details, calculations, and permit documents. The completed package gives the owner and contractor clear information for pricing, coordination, plan review, and construction planning.

Room Addition Projects We Support

The appropriate design approach depends on the existing home, the proposed use of the new space, and the way the addition connects to the current structure. Projects may include:

Rear and side additions that expand the existing floor plan
Bedroom, family room, kitchen, dining area, or home office additions
Primary suite and other multi-purpose living-space additions
Second-story additions and other vertical expansions where the property and scope support them
Additions that create new openings or connections to existing walls, floors, roofs, or framing

What May Be Included in the Drawing Package

The exact package depends on the property, project scope, and permitting jurisdiction. A room addition package may include:

Existing-condition drawings based on available records and verified project information
Proposed floor plans and exterior elevations.
Architectural sections and details needed to explain the addition
Structural framing plans, connection details, and supporting calculations where required
Coordination notes between the architectural and structural sets
Responses to plan-check comments related to documents prepared by STEN Engineering when included in the agreed scope

How the Room Addition Design Process Works

Project review. We review the property address, project goals, available drawings, photos, and the type of space you want to add
Existing information. The team identifies which existing conditions and measurements must be documented for the design
Scope and concept. The proposed layout, project limits, and required architectural and structural tasks are defined
Architectural drawings. Floor plans, elevations, sections, and project details are developed for the confirmed scope
Structural coordination. Framing, openings, connections, details, and calculations are coordinated with the architectural design
Permit documentation and support. The drawing package is prepared for the applicable submission process, with plan-check support provided according to the agreed scope

What to Send for an Initial Project Review

The property address and a short description of the proposed addition
Photos of the existing home and the area where the addition is planned
Existing plans, surveys, sketches, or permit records, if available
Approximate room sizes, intended use, and any layout priorities
Any correction notice or agency comment already received for the project

If the project is a remodel without added square footage, review our structural engineering for home remodels. For broader residential work, see our residential structural engineering services. For broader architectural planning, explore our architectural design services

Frequently Asked Questions

Do I need both an architect and a structural engineer for a room addition?

Many room additions require both architectural design and structural engineering. The exact team and documents depend on the proposed layout, structural changes, and local permitting requirements

Can STEN Engineering prepare room addition drawings for permit submittal?

STEN Engineering can prepare architectural and structural documents for the agreed project scope. The required package and review process depend on the property and jurisdiction, and permit approval cannot be guaranteed

Can you design a second-story addition?

Second-story additions can be reviewed as part of the room addition scope. The design approach depends on the existing home, proposed layout, structural requirements, and applicable local rules

Does this service include construction?

This page describes architectural and structural design services. Any construction or contractor scope should be confirmed separately before the project begins

Fill out the form below for a free consultation

Your Name

Phone Number

Email Address

Preferred contact method

Preferred contact times

Message

SMS Consent

By checking this box, I consent to receive conversational SMS messages from STEN Engineering related to my inquiry, appointment, consultation, or project

Why choose sten engineering?

Professional engineers

Responsible and reliable

Short wait time

Excellent service

Affordable cost

what our clients say

I had the difficult task of remodeling my home. I needed to remove a wall to make my living room kitchen open planned and a wall put up to turn my spacious master bedroom into two rooms for my sons. I sought out a contractor and I thought they would handle everything needed to be done. For extra fees they could find me a structural engineer and architect so to save some money I did it myself. I found Sten Engineering on Yelp, they didn't have any reviews but after a lengthy phone call, they were able to put my mind at ease. They were pretty fast at coming up with a proposal and everything was professional and covered all the bases.I was still very happy with my decision. They got the measurements they needed and drew up the plans in what I would take much longer. They got their work seen by the city and there was a lot of going back and forth with corrections. I felt very comfortable with Sten Engineering and felt I got my money's worth. I hope it goes this way with my contractor and the building process. Thank you very much!

Tony C.South Pasadena, CA

I met Sten Engineering in the Summer and came to their office after they contacted about the soft story work needing done on my building. I like that they were pro active and contacted me instead of vice versa. Their office was very welcoming and professional looking, not what I was expecting from a start up company but excuse my ignorance. The building they are in says it's visitors must wear a mask at all times and these gentlemen offer hand sanitizer as you come in the office. I felt very safe. We discussed the process of the work to be done and I felt it was very affordable, cheaper than the bigger structural engineers I had spoken with. But this in no way shape or form diminished the work they did for me. I got my plans in no time from Sten Engineering. I appreciate everything Sten Engineering did for me. 10 star service! Thank you!!!

Olena M.Los Angeles, CA

When constructing my ADU, I was told I needed a structural engineer to draw up the plans. I did a quick Google search and found these guys. I called and polite gentleman answered and passed me to Evgeny who was very informative and helpful on the phone. We arranged a time to meet because he needed to make measurements and he made the whole procedure go very smoothly. He even offered me a contractor to do the construction who was very professional compared to the many cowboys out there. If these guys keep going what they are doing, they will be a very profitable business indeed.

Ann G.Los Angeles, CA

We live in a studio and our shower is out in the open. This caused mold issues so we needed to have it enclosed and ventilated. I contacted contractor and they said they could do the job but first of I needed engineers to draw up the plans to get clearance from the city for the work to be done. They recommended STEN Engineering, I called and spoke to Evgeny and he talked me through the process and cost. He was very patient with me because he could tell this was all new to me. I went to the office which is COVID-19 compliant in my eyes, mask wearing, hand sanitizer on supply, and met his partner Tomik. These are both family men and you can tell they are very caring and attentive at home from how they were with me. I only worked with them for a few weeks but my time with them made a big impression, I wish them the best of success. Thank you guys.

Joseph F.Los Angeles, CA