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Addition Costs

Case Study 1: Master bath and living room

  • Master suite addition on the main floor
  • Exposed-beam patio
  • Front porch addition
  • Larger living room
  • Office
  • Concrete patio, hot tub space and walkways
  • New flooring throughout the main level of the home
  • Cost: $420,103
addition floorplan
hubbard addition
hubbard addition
hubbard addition

Case Study 2: Addition and Kitchen remodel

  • Additional SF
  • Deck with timber framed patio cover
  • Completely new kitchen with gas range
  • New flooring throughout home
  • Hot tub deck, screen and hookup
  • Cost: $295,000
addition floorplan
Glen Oak Road Addition and kitchen
15015 Glen Oak Road Addition
Glen Oak Road Addition

Average Portland Addition Costs

Source: Remodeling Magazine

master suite addition midrange



Add 24x16-foot master bedroom suite over crawlspace

Include walk-in closet/dressing area, freestanding soaker tub, separate 3x4- foot ceramic tile shower, and double-bowl vanity with solid-surface countertop

Carpet the bedroom floor; put tile in bath

Paint walls, ceiling, and trim. Install general and spot lighting, exhaust fan

master suite addition upscale



Add 32x20-foot master bedroom suite over crawlspace

Add spacious sleeping area with lounging/sitting area adjacent to large master bath

Custom bookcases and built-in storage

High-end gas fireplace with stone hearth and custom mantle

Walk-in closet/dressing area with natural light, mirrors, and linen storage

Bathroom includes walk-in shower with dual-shower system, stone walls and floor, and custom frameless glass enclosure

Freestanding soaker tub

Two sinks in separate custom vanities with stone countertops and large mirrors

Partitioned area for luxury one-piece toilet

Outside the bath, add 5-foot-long hospitality center with bar sink, undercounter refrigerator, custom cabinetry, stone countertop, and microwave

Include soundproofing, in-floor heating, custom wall finishes and hardware, general and spot lighting, and high-end lighting controls

bathroom addition midrange



Add 6x8-foot bathroom over crawlspace with poured concrete walls

Cultured-stone vanity top with molded sink; standard chrome faucets

30x60-inch white fiberglass tub/shower with ceramic tile surround

Single-lever temperature and pressure-balanced faucet

White low-profile toilet

General and spot lighting; electrical wiring to code; mirrored medicine cabinet; linen storage closet or cabinet; painted trim

Ceramic tile floor

bathroom addition upscale



Add new 100-square-foot master bath to existing master bedroom over crawlspace

Include 42x42-inch neo-angle shower with ceramic tile walls, accent strip, recessed shower caddy, body-spray fixtures, and frameless glass enclosure

Freestanding soaker tub with high-end faucets

Stone countertop with two sinks; two mirrored medicine cabinets with lighting

Compartmentalized commode area with one-piece toilet and a humidistat-controlled exhaust fan

Matching ceramic tiles on the floor, laid on diagonal with ceramic tile base molding

General and spot lighting and waterproof shower fixture

Cabinetry has custom drawer base, wall cabinets

Extend HVAC

Electric in-floor heating

The value of an addition

Studies show homeowners can realize nearly a 70% return on their investment for adding a master suite and up to a 75% return for bathroom additions.

A professionally built addition not only gives you more square footage, it enhances the long-term value of your home.


Hubbard Addition

Client testimonials

"We couldn't be more happy with the finished product. We have been enjoying our new living space for a full year now and love it just as much as the day it was completed!"

Robert and Diane / SW Portland Kitchen Remodel

"We are thrilled, and the work is above our expectations! We're extremely happy with the quality and the processes Lamont Bros. had in place to complete our goals. All workers were friendly, polite, communicated effectively, were here on time, and conveyed the status of the job at all times."

Mark and Wilda / Oregon City Portland Kitchen & Bathroom Remodel

"I wish I could leave a higher rating than 5 stars! These guys set the bar extremely high in terms of customer service and quality work. Joseph is incredibly knowledgeable and helpful and helped me do some structural analysis on my house. Everyone I've worked with at Lamont Bros. is awesome! I will definitely use these guys again!"

Dan / SE Portland Multiple Projects

"After working with Joseph & his crew from the Lamont Bros., we are enjoying a beautiful new kitchen. We appreciated the design process & the hard-working team who completed our work. Special kudos to Rebecca who painstakingly mounted our tile back splash -- first thing everyone notices!"

Kathy / SE Portland Kitchen and Outdoor Space

"We had a tree fall on our house at the worst possible time of year. We contacted Lamont Bros. and they responded immediately. We had a quote in a very reasonable time frame,  and they dealt with all the insurance issues. Lamont Bros. managed to get the job done when they said it would be done. And done right the first time."

Dan / Clackamas County Structural Repair

"After looking for a good local company to add a craft room to our ranch style home, we found Lamont Bros and couldn't be happier with the quality of the work and performance of the crew. The design Joseph came up with was better than we hoped for. We highly recommend this company to anyone looking for a good fair deal. Thank you Joseph and crew!"

Susan / Oregon City Addition