Crawl Space And Attic Projects That You’ll Only Need To Do Once.

Rodent damage warranty

Most reliable protection plan in the industry


18 Month no interest no down payment

Personalized Assistance

Direct support from the business owners

Quality control

Ensuring quality in every project

Your one-stop solution for all attic and crawl space needs. From insulation and drainage to air duct services, rodent proofing, structural repair, moisture control, and mold remediation, we’ve got you covered




Free Estimate

Gain clarity on project scope and cost upfront with our complimentary estimate service, empowering informed decision-making.



Our professional and courteous crew strives for excellence, delivering top-notch results and setting industry-leading customer standards.


Quality Control

In addition to comprehensive documentation, our management team conducts post-project visits to ensure our standards are maintained.


After Care

Experience ongoing support and satisfaction even after project completion, with comprehensive aftercare services addressing any post-project needs.

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Bojidar After

A family home had a hidden problem Beneath

Battling Hidden Moisture: 80’s Home Crawl Space Transformation

Project Details

A family home had a hidden problem. Beneath their home was a crawl space, dark and damp, plagued by mold and excessive moisture. Concerned about the health and efficiency of their home, they reached out to us for help.

The team arrived promptly, ready to tackle the challenges lurking below the house. They began by removing all compromised materials, including the old vapor barrier, soggy insulation, and even remnants of animal waste. With determination and care, they thoroughly sanitized the area, making it safe and clean once more.

To combat the persistent mold, they treated all the wooden surfaces with a powerful fungicide solution, effectively eliminating the mold on contact. To ensure the mold would not return, they applied a primer, sealing the wood and safeguarding it from future growth.

Addressing the moisture issue, the team installed a French drain around the entire perimeter of the crawl space. They added a catch basin and sump pump to keep the area dry and free of standing water, creating a more stable environment beneath the home.

Understanding the importance of a rodent-free space, they meticulously sealed all potential entry points. They also addressed air leaks around plumbing, ducting, and electrical penetrations, enhancing the home’s energy efficiency. The final touches included installing a new vapor barrier, wrapping water supply lines, and insulating the floor with high-quality insulation.

To further improve the crawl space, they sealed all air duct joints with mastic paste, preventing any air leakage and ensuring proper insulation for the ducts. They installed a brand-new crawl space door and built a sturdy access cover, securing the area for future inspections.

As a final measure of protection, the team introduced a one-year rodent protection plan. They placed traps and scheduled regular monitoring every three months, ensuring the family could rest easy knowing their home was well-guarded.

The family’s crawl space, once a source of worry and potential danger, is now a clean, dry, and secure area, thanks to the diligent work of the professional team. The house stands stronger and healthier, ready to shelter its inhabitants for many more years to come.

Location: Snohomish, WA

Duration: 1 day


  • Clean and Sanitize: Removed old insulation, vapor barrier, animal feces, nests, carcasses, and debris. Sanitized with a mold inhibitor.
  • Rodent Exclusion: Sealed all entry points using concrete, steel wire, construction adhesive, and re-screened vents.
  • Prescriptive Air Seal: Sealed air leaks around plumbing, ducting, and electrical wiring with foam.
  • Vapor Barrier Installation: Installed 6-mil black plastic vapor barrier secured with deep ground stakes and sealed with industry-standard tape.
  • Insulation: Wrapped water supply lines with R11 fiberglass insulation and installed R25 fiberglass batted insulation on the floor.
  • Sump Pump System Installation (10-Year Warranty):
    • Preparation: Protected work area and removed standing water.
    • French Drain Installation: Installed along the foundation’s inner side with lava rock and a perforated pipe.
    • Catch Basin Setup: Installed a perforated backfill basin with lava rock filtration.
    • Sump Pump Installation: Set up a 1/2 hp cast-iron sump pump with a flood alarm system.
    • Water Discharge: Directed water away from the house using a solid PVC pipe.
  • Rigid Duct Package: Sealed the ducts at all joints, corners, and saddles with water-based Mastic paste to prevent air leakage.
  • Crawl Space Door Installation: Installed a sealed treated-wood frame and cover with a latch.
  • Rodent Protection Plan (1 Year): Monitored rodent traps every three months with ongoing exclusion services and an unlimited damage warranty contingent on an active plan.




Bathroom Insulation

The resident recently had mold remediation work done

From Moisture Damage to a Fresh Finish

Project Details

The resident recently had mold remediation work done in the attic due to moisture issues. Seeking a long-term solution, the resident reached out to us for professional help. Our team began on improving ventilation in the bathroom that included installing a new air duct between the fan and the roof vent, installing new insulation and dry wall panels. With our expertise, we improved the ventilation in the bathroom and attic, ensuring a mold free and efficient home.

Thanks to our efforts, the bathroom transformed from a inefficient area into a clean, secure, and well-maintained part of the home. The resident now enjoys a healthier living environment, free mold, and can rest easy knowing their attic is protected for the future.

Location: Bellevue, WA

Duration: 1 day


  • Air Duct Installation for Bathroom Fan: Installed 4 inch R8 flexible air duct with a vapor barrier jack securely between the fan outlet and the roof vent, ensuring a snug fit, undamaged vapor barrier integrity, and proper support for efficient airflow and moisture resistance.
  • Insulation and Drywall Repair: Installed fiberglass batter insulation in the joist cavity. Installed 3/8 inch drywall panels throughout the room ceiling. Tapped and mudded drywall seams.


This full scale crawl space remediation project was
Brand New Crawl Space Installation: $0 Down and 18 Monthly Payments
Spanaway, WA 98387

Project Details

Project Overview: This full-scale crawl space remediation project was designed to restore and protect a residential crawl space from damage and infestations. The project covered everything from thorough cleaning and sanitation to advanced rodent exclusion techniques, enhanced insulation, and ongoing rodent monitoring.

Tasks Performed:

  1. Clean and Sanitize:
    • Removed old insulation, vapor barriers, and all forms of debris including animal feces, nests, and carcasses.
    • Thoroughly sanitized the area with a disinfecting mold inhibitor that eliminates viruses, bacteria, mold, and mildew.
  2. Rodent Exclusion:
    • Sealed all potential entry points using a combination of concrete, steel wire, and construction adhesive.
    • Re-screened vents as necessary to prevent future intrusions.
  3. Prescriptive Air Seal:
    • Applied foam sealant around areas where plumbing, ducting, or electrical wiring penetrates the crawl space to prevent air leaks.
  4. Vapor Barrier Installation:
    • Installed a 6-mil black plastic vapor barrier, secured along the edges with deep ground stakes and sealed at the seams with high-grade tape.
  5. Insulation Upgrades:
    • Wrapped water supply lines with R11 fiberglass insulation.
    • Installed R30 fiberglass batted insulation in the flooring, secured with durable synthetic twine.
    • Applied R11 insulation to the main trunk wrap.
  6. Crawl Space Door Installation:
    • Constructed a sealed, treated-wood frame around the crawl space entrance with a vertically-mounted wood cover secured by a latch for easy access and enhanced security.
  7. Rodent Protection Plan:
    • Initiated a year-long rodent monitoring plan with quarterly checks for new rodent activity and additional exclusion measures as needed.
    • Provided an ongoing warranty against rodent damage to the remediated areas, contingent on maintaining an active rodent control plan.

Outcome: The project successfully revitalized the crawl space, enhancing its structural integrity, air quality, and thermal efficiency. Long-term protection measures were put in place to ensure the crawl space remains clean, dry, and rodent-free, substantially reducing the risk of future issues and damage.

Project Highlights:

  • Comprehensive approach covering cleaning, exclusion, insulation, and ongoing protection.
  • Use of high-quality materials and innovative techniques for lasting results.
  • Focus on both immediate remediation and long-term prevention of issues.


Northwest Crawl Space Services is family-owned right here in the Pacific Northwest. With years of experience, we’re licensed and bonded and always prioritize our customer’s satisfaction. Please read some of our 5-star reviews from our happy customers.

Myong Soo Kim
Myong Soo Kim
9 March 2023
Exceed their promises..excellent communication and great crew. Highly recommend.
Thomas Roberts
Thomas Roberts
9 March 2023
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
3 March 2023
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
6 February 2023
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
26 January 2023
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
17 December 2022
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
16 December 2022
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
15 December 2022
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
18 November 2022
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.


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Crawl Space And Attic Projects That You’ll Only Need To Do Once. Rodent damage warranty Most reliable protection plan in the industry Financing 18 Month no interest no down payment Personalized Assistance Direct support from the business owners Quality control Ensuring quality in every project Your one-stop solution for all attic and crawl space needs. […]

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Eco wool insulation is poured in the attic