Northwest Crawl Space Services

Phone: (888) 246-5837

Office Hours: 8AM – 5PM PST

Do it right. do it once!

Northwest Crawl Space Services specializes in crawl space and attic cleaning, insulation, drainage and rodent control. We focus on sustainable solutions for rodent problems and energy efficiency for your home. Our vision is to service all our customers with great care, while putting professionalism and quality first.

2024 PSE upgraded insulation rebates
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Licensed - Bonded – Insured

Locally Owned and Operated

Serving: Snohomish, Skagit, Whatcom, King, Pierce, Kitsap, Thurston, Mason, and Lewis Counties

5-Star Rated on Google – Yelp – Facebook

BBB Accredited A+ Rating

Northwest Radio Forecast Sponsors

Our Residential Services

Crawl Space & Attic Services

Hand Sealing House Air Duct Joint

Air Duct Repair, Sealing & Replacement

Heating and cooling air ducts in our homes can experience a variety of issues that can lead to loss of function, wasted energy and sometimes even health hazards.


Crawl Space & Attic Cleaning

If your home’s crawl space and attic have been overlooked for a few years, they can become a dirty mess. You could have sewage, debris, mold, rodents and more.

residential roof ventilation

Crawl Space & Attic Ventilation

Our company provides a range of ventilation solutions for your attic and crawl space to increase energy efficiency, prevent mold, and save you money.

Crawl space fully encapsulated with thermo regulatory blankets

Vapor Barrier & Encapsulation Services

A vapor barrier is essential for every crawl space that doesn’t have a concrete slab poured in it. Vapor barriers prevent moisture from coming up from the ground.


Home Insulation Repair & Install Services

Here in Washington State, your home insulation is an important part of keeping you comfortable and cozy - and is a major factor in your energy bill.


Mold Remediation & Removal

The growth of mold in your home’s crawl space and attic can be very hazardous for your family’s health and can damage the structure of your home over time.

Crawl Space Under Residential Home

Residential Structural Repair

Here in the Pacific Northwest, water in your crawl space is a very common issue that can result in serious foundation damage.

Water & Drainage Services


Crawl Space Drainage Repair

Water in your home’s crawl space can be destructive and can cause mold growth and compromise the entire house foundation, causing expensive repairs.

Laying and installation of a drainage pipe

Exterior Drainage Repair Services

Exterior drainage failure or deficiency can cause water to seep under or through the house’s foundation and can result in standing water in the crawl space.

Water mitigation, disaster recovery

Water Damage Restoration Services

Water leak, broken pipes, broken dishwasher, sewer backup, storm damage and even high tide, can create serious water damage in your crawl space.

Rodent Prevention Services


Residential Rodent Protection Plan

In order to guarantee sustainability and long-term results for all our crawl space and attic projects, we offer a unique rodent protection plan.

residential rodent slab

Residential Rodent Slab Installation

Combined with general rodent exclusion, rodent slab provides a permanent solution for the most stubborn rodent problems in your crawl space.


Rodent Control & Exclusion Services

Our area has many species of destructive rodents which can enter your home through your attic or crawlspace, from rats to mice, raccoons, and Squirrels.

Before & After Gallery

crawl 1 beforecrawl 1 after
crawl 2 beforecrawl 2 after
crawl 3 beforecrawl 3 after
Crawl 5 BeforeCrawl 5 AFter
floor mold beforefloor mold after
attic mold beforeattic mold after
Myong Soo Kim
Myong Soo Kim
Exceed their promises..excellent communication and great crew. Highly recommend.
Thomas Roberts
Thomas Roberts
Rob and crew from NW Crawl Space did full remediation for our crawl space and attic, after finding evidence of rodents (mice) in both areas. Removed old crawl space insulation & vapor barrier, replaced heat-ducts that were damaged, & vacuumed out attic insulation and debris. Sealed openings in both areas to prevent rodents from returning. Traps set, with rodent control plan. Highly recommended!
Emily Davis
Emily Davis
Northwest Crawl Space Services has been honest, professional, easy to work with, and has done excellent work on my home. I first approached the company looking for someone to reinsulate and clean out my mud room crawlspace-- it is an addition to the house and is open-air. Lior came by and noted that because NWCSS specializes in fiberglass insulation, they wouldn't be able to work on this part of my house, because it would require spray foam insulation to truly be rat and weather proofed. I really appreciated this up front honesty-- two previous contractors had given me bids to reinsulate with fiberglass, never mentioning the need for spray foam, and never saying that they wouldn't be able to do a proper job. I would have paid money to some other company for a shoddy, inappropriate "solution" if Lior had not filled me in. Lior even recommended some other companies to call that specialize in spray foam! After this helpful and informative experience, I knew right away when I discovered signs of rats in my main basement crawlspace that I wanted NWCSS to be the ones to work on the problem. Lior came by to check it out and did a very thorough inspection. His manner with clients is excellent-- I never felt like my questions were being dismissed. We set a date for a crew to come by to replace rat-infested insulation, remove the improperly installed vapor barrier, clean out debris, and reinstall vapor barrier to industry standards. The crew, Patrick and Chandler, were friendly, polite, and happy to answer questions. Savannah in the office has also been very friendly and quick to answer my questions regarding logistics and payment. Overall, my experience was excellent and I will re-hire NWCSS when it comes time to reinsulate and clean out my attic crawlspace.
jan ostrovsky
jan ostrovsky
Matan gave us a fair estimate for the crawl space re-insulation and screening, and the work was done promptly. I was pleasantly surprised when the final bill came in about 15% UNDER the estimate. It’s nice to deal with a company which has the integrity to pass those savings on.
Dan Huang
Dan Huang
Northwest Crawl Space is a trustful company to work with. They helped me install the French drain, replace the insulation and vapor barrier. Matan and his stuff did a great job. They will carefully protect your home when performing the job, clean the waste after the work is done, and come back to inspect if the work is good.
Scott Taylor
Scott Taylor
We had Northwest crawlspace come out to inspect our crawlspace and they identify a lot of standing water as well as rodent activity in the insulation. As a result, we needed a full clean out of our crawlspace and new insulation, vapor barrier, drain and sump pump. The crew was professional, friendly and fast. The work was extremely well done, we recently had them come out to check everything and the technician confirmed it was one of the best installs he had seen. I would highly recommend this company to anyone.
Ricardo Salvatierra
Ricardo Salvatierra
My experience with this company has been amazing. Lior (the owner) goes above and beyon every single aspect, super professional and always providing the best advice to avoid unnecessary expenses. They did the whole work in my crawlspace, sump pump, french drain, vapor barrier, etc... and results are great, 0 moisture. I would definitely recommend it.
Torrey Olsen
Torrey Olsen
Lior and his NW Crawl Space Services team were everything we expected in professionals! They were on time, neat, though, communicative, polite, did the job as promised and then checked back with us as promised again to ensure that the job was done!
Wayne Appler
Wayne Appler
I had Northwest Crawl Space Services remove all my rodent infested insulation and vapor barrier. They cleaned & disinfected my crawl and installed all new insulation and a sealed vapor barrier. The workers were very diligent and and skilled in their methods. I was given a quote up front and feel that I received a quality job that was worth every penny. I am beyond pleased with the company and would highly recommend them to everyone.