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World Tree Service, Inc.

Tree Service
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Marin County
Diamond Certified Company Report
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World Tree Service, Inc.
455 SURVEYS
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  • Rating
23 CONSECUTIVE YEARS
SINCE JANUARY 2003
CERT 205

Diamond Certified Ratings Dashboard

455

Verified Customers

Surveyed

Customer Loyalty

Customer Satisfaction

Helpful Expertise

READ ALL 455 SURVEY RESPONSES

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance

Company Report Menu

  • Survey Responses
  • Diamond Certified Video Player
  • Researched Articles & Profile
  • Capabilities
  • Photos
  • Expert Contributor Advice & Tips
  • Website & External Feeds

Diamond Certified Company Report SUMMARY UPDATE April 2025

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World Tree Service, Inc.

Rated Highest in Quality and Helpful Expertise for 23 Consecutive Years.

Quick Summary

  • Diamond Certified since 2003
  • Provides full-service tree care for residential and commercial clients throughout the Bay Area
  • Two ISA Tree Risk Assessment Qualified (TRAQ) arborists on staff
  • Offers free consultations and quotes

Top News Updated

COMPANY MILESTONES

World Tree Service, Inc. is celebrating its 28th anniversary in 2025.

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Top Survey Responses

From a recent Diamond Certified Survey Response: “We had a very sick pear tree that I had given up on, but their arborist came out and said there was a...

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From a recent Diamond Certified Survey Response: “They’re efficient and knowledgeable, and the price is right. The owner has a lot of experience. I’ve always been satisfied.”

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Trending Projects

World Tree Service, Inc. received high praise for their prompt and professional service on a recent project. After an oak tree fell on a client’s property, the company responded quickly,...

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World Tree Service, Inc.
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Diamond Certified Researched Articles on World Tree Service, Inc.

researched article

Owner James Cairnes works on a client’s eucalyptus tree.

World Tree Service, Inc. offers full-service tree care to clients throughout the Bay Area. The company’s services include hazardous tree removal, pruning, safety trimming, preventive maintenance, arborist reports, stump grinding, diagnosis and treatment, and emergency response. It also offers consulting services and uses multi-technical methods to tend and restore trees.

Partners James Cairnes and Natalie Carey are both California-certified and ISA Tree Risk Assessment Qualified (TRAQ) arborists who are marking their 28th year doing business in Marin County. Mr. Cairnes received his national diploma in arboriculture in England in 1990, and he practiced tree care in five countries before settling in California. He says World Tree Service is committed to providing high-quality tree care with an honest, knowledgeable, professional approach that has earned the respect and trust of clients.

To see a full list of World Tree Service’s capabilities, Mr. Cairnes invites potential customers to visit www.smallworldtree.com.

“We give our customers personal attention and listen to their concerns. The same dedicated individuals see each job through and develop a rapport with each client. We're conscientious about our work and meticulous about cleaning up after ourselves. We keep up with the latest advancements in tree care to ensure our services remain on the cutting edge.”

When hiring a tree care service, make sure it’s led by a certified arborist. Legally, one doesn’t need certification to care for or remove trees, but employing a non-certified person can be a risky proposition. “There are considerable safety issues involved with tree work,” says James Cairnes, owner of Small World Tree Company. “Both people and property are at risk if something goes wrong.”

A tree worker aloft needs to know what they’re doing to safely perform their job, and removing a tree usually isn’t as simple as cutting it down. “There’s definitely a methodology to it,” says Mr. Cairnes. “A tree care provider needs to do a risk assessment beforehand to see if there are any utility lines among the roots or if there’s a risk to a building if a tree comes down the wrong way.” Someone who doesn’t know what they’re doing can trigger a significant amount of damage or cause serious injuries.

A certified arborist can also help advise how to maintain healthy trees on your property. “A lot of people overwater mature oak trees,” says Mr. Cairnes. “Oaks go into decline if they get too much water in summer months. The best thing for them is to apply wood chips or mulch to the base, which keep out other plants and weeds and retain soil moisture. Also, have your property’s irrigation systems checked to ensure they’re working properly and not leaking too much water.”

Before moving to Marin County and founding World Tree Service, Inc. in 1997, James Cairnes attained a National Diploma in Arboriculture at England's Merrist Wood College and practiced tree care in five countries around the world. "My training is pretty unique in the industry," says Mr. Cairnes. "My worldwide experience in different aspects of arboriculture work–including climbing and hands-on work–is particularly valuable to our clients. I'm not just a salesman."

World Tree Service, Inc. provides a variety of arboriculture services to Bay Area clients, from planting new trees to extending the life of mature trees through techniques like reducing canopy weight. "We provide a full range of tree services," says Mr. Cairnes, "including planting, fertilization, pruning young and mature trees, tree removal–sometimes with cranes and in difficult access situations–and diagnosis and treatment for a variety of arboreal diseases."

World Tree Service's field team has years of practical experience. "I've worked with my two key guys for 12 years," says Mr. Cairnes, "and they've been with my company for six and four years, respectively. I trust their experience, quality and conscientiousness." Mr. Cairnes stresses general care of clients' property and detailed clean-up.

"We also strive to maintain a healthy habitat for the various animal species that live in the trees we service," says Mr. Cairnes. "I volunteer for a local wild animal rescue organization, helping restore baby owls and other birds to their nests, and I take that volunteer spirit with me to each job. We'll recommend pruning in certain seasons to help maintain animal habitats, and I'm happy to help clients build things like barn owl boxes to encourage healthy ecosystems on their properties."

Owner James Cairnes has worldwide tree care experience.-World Tree Service, Inc.Owner James Cairnes has worldwide tree care experience.

Diamond Certified Researched Capabilities on World Tree Service, Inc.

Service Area

serving area
Alameda County
Contra Costa County
Marin County
Sonoma County
Santa Clara County
Santa Cruz County
Solano County
San Mateo County
San Francisco
Serving the Bay Area

Main Services

Tree Service
  • Crown Lifting
  • Land Clearing
  • Shrub Trimming
  • Stump Grinding
  • Stump Removal
  • Tree Care
  • Tree Cutting
  • Tree Maintenance
  • Tree Pruning
  • Tree Removal
  • Tree Root Removal
  • Tree Trimming

Additional Services

Full-Service Tree Care
Aesthetic & View Pruning
Native Oak Care & Maintenance
Expert Removal of Hazardous Trees
Safety Trimming/Preventive Maintenance
Arborist Reports
Safety & Health Evaluations
Stump Grinding
Lot Clearing & Fire Breaks
Fire Defensible Space Experts

Company Info

Hours
Mon
07:00 am - 06:00 pm
Tue
07:00 am - 06:00 pm
Wed
07:00 am - 06:00 pm
Thu
07:00 am - 06:00 pm
Fri
07:00 am - 06:00 pm
Sat
Closed
Sun
Closed
Closed
Mon – Fri: 7am – 6pm
Website
Contact
World Tree Service, Inc.

Capabilities Table

Company Name
World Tree Service, Inc.
Phone Number
DCID Number
DCID4154550909
Managers
James Cairnes, Certified Arb., ISA TRAQ,
Natalie Carey, Certified Arb., ISA TRAQ
Years in Industry
32 (Mr. Cairnes)
# of Employees
5
License
982691
Memberships
International Society of Aboriculture
Insurance
Liability Insurance,
Workers' Compensation
Founded
1997
Customer Type
Residential, Commercial, Municipal
Warranties & Guarantees
Satisfaction Guaranteed

Certifications & Awards

diamond certified logo

Key Factors

World Tree Service, Inc. Residential & Commercial
Residential & Commercial
World Tree Service, Inc. Free Quotes & Consultations
Free Quotes & Consultations
World Tree Service, Inc. Appointments Available
Appointments Available
World Tree Service, Inc. Worksmanship Guaranteed
Worksmanship Guaranteed

Select Photos From World Tree Service, Inc.

1 of 1Picture of Owner James Cairnes works on a client's eucalyptus tree. - World Tree Service, Inc.
Owner James Cairnes works on a client's eucalyptus tree.
Picture of Owner James Cairnes works on a client's eucalyptus tree. - World Tree Service, Inc.

Diamond Certified Expert Contributor Advice & Tips

James Cairnes is a 26-year veteran of the tree service industry and owner of World Tree Service, Inc., a Diamond Certified company since 2002. He can be reached at (415) 868-5904 or by email.

James Cairnes is a 26-year veteran of the tree service industry and owner of World Tree Service, Inc., a Diamond Certified company since 2002. He can be reached at (415) 868-5904 or by email.

James Cairnes: Climbing to the Top

By James Florence, Diamond Certified Resource Reporter

SAN ANSELMO — For James Cairnes, an adolescent injury became an unlikely catalyst for a lifelong career in an unfamiliar field. “I was in a motorcycle accident when I was 17 and ended up in the hospital,” he remembers. “The guy in the bed next to me was an arborist. I had no idea what an arborist was, so he told me all about it. I found it fascinating, and when I started college the following year, I enrolled in a three-year arboricult...

Read Full Article - James Cairnes: Climbing to the Top

World Tree Service, Inc. Website and External Feeds

Marin Business Owner Helps Rescue Orangutans in Borneo

Social Media Links

FAQs

By World Tree Service, Inc.

Do you spray trees? Are your methods safe for animals?

When is the best time to fertilize trees?

Mr. Cairnes has great credentials, but what about the person who will actually care for my trees?

My redwood trees are turning yellow and look like they’re dying. Are they?

World Tree Service, Inc. Ratings and Survey Responses

diamondcertified logo
World Tree Service, Inc.
455 SURVEYS
  • star image
  • star image
  • star image
  • star image
  • star image
  • Rating
23 CONSECUTIVE YEARS
SINCE JANUARY 2003
CERT 205

Diamond Certified Ratings Dashboard

Customer Satisfaction

Customer Loyalty

Helpful Expertise

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance

Phone Survey Responsesfrom 455 Verified Customers

Ava M.

They have fair prices. They show up and do a good job. They care about customer satisfaction.

They responded quickly when I called them.

Verified Customer of World Tree Service, Inc., 1 of 455

10 Quality
Yes Loyalty
Alicia A.

They do a great job and they are prompt. They are also affordable and hardworking.

They did a fabulous job pruning our trees. They look wonderful.

Verified Customer of World Tree Service, Inc., 2 of 455

10 Quality
Yes Loyalty
Ellie K.

They are professional. They do a great job.

I liked the end product. They took good care of my trees.

Verified Customer of World Tree Service, Inc., 3 of 455

10 Quality
Yes Loyalty
Jamie C.

They were very professional, very knowledgeable, and we had a tree go down that we discovered at 6:00 PM. They came out at 6:00 PM and they took a look at the tree and helped us make a decision about what to do. They came back the next day and they took care of the tree and they took all of the debris. It was very helpful that they did it so quickly. We were impressed that they came out at 6:00 PM.

We don't know anything about trees. They were very knowledgeable and professional. We have several large trees that we wanted them to cut, but we wanted to keep the integrity of the trees. They were very good about cutting off only what needed to be cut off and in keeping the shape of the tree. Everything they did was great.

Verified Customer of World Tree Service, Inc., 4 of 455

10 Quality
Yes Loyalty
Dale M.

We had a very sick pear tree that I had given up on, so the arborist came out and worked on it. He said there was a 50/50 chance that my pear tree would survive. It's a year later and my pear tree has never looked better.

He knew his business. He was very knowledgeable, professional, quick, and explained everything that was going on. I was very happy with his work. I liked that he was an arborist, not just a tree trimmer.

Verified Customer of World Tree Service, Inc., 5 of 455

10 Quality
Yes Loyalty
Steve S.

The service is personal. The owner is very much in contact with each job and how it is progressing, the crew is responsive, and I have referred them to my next door neighbors on both sides of me.

When the job expands, they don't take advantage of me. They put in extra effort with no charge, and they were able to help me out.

Verified Customer of World Tree Service, Inc., 6 of 455

10 Quality
Yes Loyalty
Sidney P.

They're efficient, the price is right, and they are very knowledgeable. The owner has a lot of experience. They've always been very polite. I've always used them and have always been satisfied.

I like their attitude. They are very helpful, very thorough, knowledgeable, and very pleasant.

Verified Customer of World Tree Service, Inc., 7 of 455

10 Quality
Yes Loyalty
Paul C.

Just that I looked around for several tree services and they were very responsive, came right out, and explained what needed to be done. I wouldn't hesitate to recommend them.

Just that the quality of service was excellent

Verified Customer of World Tree Service, Inc., 8 of 455

10 Quality
Yes Loyalty
Simon C.

They are reliable and professional. A lady came out and gave a quote. They seem to know their stuff. They are cautious around the neighbors' property. They were very careful.

The level of professionalism

Verified Customer of World Tree Service, Inc., 9 of 455

10 Quality
Yes Loyalty
Michele W.

They were very conscientious, very reliable, very considerate, and they do a very good job. They're very clean. I was very comfortable to have the workmen on site.

The owner was very professional. We were very happy. They're the best for that type of service.

Verified Customer of World Tree Service, Inc., 10 of 455

10 Quality
Yes Loyalty
Carol P.

I think their prices are very reasonable. They are very attentive to their customers' wishes and it's just a pleasure to work with them.

It would be hard to pick one thing because they satisfy a broad criteria of skills and attentiveness to the client's wishes. I've never had a better company.

Verified Customer of World Tree Service, Inc., 11 of 455

10 Quality
Yes Loyalty
Elizabeth D.

The owner, James, is extremely knowledgeable and is the best Arborist out there. He's worked in five different countries I believe.

I'd give James top star ratings. He did a great analysis during the work and it was a great experience. The fee was reasonable. I was just thrilled to work with him through the process.

Verified Customer of World Tree Service, Inc., 12 of 455

10 Quality
Yes Loyalty
Gary W.

They are personable and they do what they say they're going to do. They are prompt, courteous, and mindful of the owner's property.

They are on time and it's reasonably priced.

Verified Customer of World Tree Service, Inc., 13 of 455

10 Quality
Yes Loyalty
Bill M.

They were very efficient, knowledgeable, and they did a great job. They were also very respectable, and they cleaned everything up.

I think Jim cares, and he is very personable. He gets the job done efficiently. They do a great job, and if you call them, they get back to you in a timely fashion. I have used them for 15 years.

Verified Customer of World Tree Service, Inc., 14 of 455

10 Quality
Yes Loyalty
Carol S.

They did a very professional, great job. They did what I asked them to do and not more or less. They were very nice to work with.

They did a fantastic job trimming my trees and seemed very knowledgeable about trees.

Verified Customer of World Tree Service, Inc., 15 of 455

10 Quality
Yes Loyalty
Jenny A.

I felt that they listened to what I needed and they were able to work with me on finding a solution that worked within my budget.

I really like that they are a small home-based business and that I actually had contact with stake holders in the company.

Verified Customer of World Tree Service, Inc., 16 of 455

10 Quality
Yes Loyalty
Sean P.

I thought they were knowledgeable and reasonable compared to some of the big tree companies. They were very professional.

Another big tree service told us that we needed to get our oak tree removed but World Tree let us know that they didn't need to do that and just got rid of the problematic branches.

Verified Customer of World Tree Service, Inc., 17 of 455

10 Quality
Yes Loyalty
Jim O.

I would recommend them to others. They do a great job. They care for the trees, and they are very reasonably priced.

The professionalism, and they look for ways to save a tree. They want to do what you want to do, but they also want to consult you and do what is best for the trees.

Verified Customer of World Tree Service, Inc., 18 of 455

10 Quality
Yes Loyalty
Nicole S.

They were fabulous. I'd use them for anything and everything. I've already recommended them to my friends as well.

Natalie was great.

Verified Customer of World Tree Service, Inc., 19 of 455

10 Quality
Yes Loyalty
Lorraine G.

Jim and his men give the best service. They are a safe choice and they give good prices. They are very personable.

They are very reliable. They do great work. They have a high level of professionalism.

Verified Customer of World Tree Service, Inc., 20 of 455

10 Quality
Yes Loyalty
Sue D.

Natalie was wonderful, kind and timely. She was very timely in getting a quote. Her and her team were very kind.

They're very established and give you personalized service.

Verified Customer of World Tree Service, Inc., 21 of 455

10 Quality
Yes Loyalty
Maureen R.

They are very responsive to our needs. If there's anything that needs to get fixed, they are on it immediately.

They are very user friendly.

Verified Customer of World Tree Service, Inc., 22 of 455

10 Quality
Yes Loyalty
Christine P.

They are thoughtful, knowledgeable, very environmentally conscious, reasonably priced, punctual, and friendly.

They are very friendly.

Verified Customer of World Tree Service, Inc., 23 of 455

10 Quality
Yes Loyalty
Mike F.

I've used a lot of tree services over the years and now Small World Tree is the only tree service that I use.

The quality for the price

Verified Customer of World Tree Service, Inc., 24 of 455

10 Quality
Yes Loyalty
John&Patricia O.

They come when they say they are going to, they are professional, and they clean up beautifully afterwards.

I like the people I work with, Natalie and Jim.

Verified Customer of World Tree Service, Inc., 25 of 455

10 Quality
Yes Loyalty
James P.

Since I had that work done, I've had the Arborist look at some other things, but he never got back to me.

The work that was done was done excellently and quickly.

Verified Customer of World Tree Service, Inc., 26 of 455

10 Quality
Yes Loyalty
Craig M.

I have actually recommended them to people a lot. They're always on time, prompt and do great service.

Their professionalism

Verified Customer of World Tree Service, Inc., 27 of 455

10 Quality
Yes Loyalty
Aaron S.

They are professional, reliable, and they listen to the customer and follow through with their work.

The actual work they did was great. I also was very impressed with James. He's easy to reach and accessible. He promptly returns phone calls and schedules the work to be done in a timely manner.

Verified Customer of World Tree Service, Inc., 28 of 455

10 Quality
Yes Loyalty
Chris H.

They know their business. They do an excellent job in a timely fashion, and they are affordable.

They tell you exactly what you need. They don't ask you to do other things you don't need. They are honest and straightforward. We are totally happy with them.

Verified Customer of World Tree Service, Inc., 29 of 455

10 Quality
Yes Loyalty
Eric V.

I think that they're fabulous. They're wonderful, do good work and know their stuff about trees.

The owners are wonderful people.

Verified Customer of World Tree Service, Inc., 30 of 455

10 Quality
Yes Loyalty
Bob T.

They do excellent work, but always get a bid from somewhere else, because they're a bit pricey.

The quality of their work

Verified Customer of World Tree Service, Inc., 31 of 455

10 Quality
Yes Loyalty
Bruce D.

They are friendly, knowledgeable and hard working. They were a pleasure to have in our home.

They did a good job.

Verified Customer of World Tree Service, Inc., 32 of 455

10 Quality
Yes Loyalty
Thad L.

They did the job in a timely manner. They gave us a fair price. I was happy with everything.

I don't get tree service done too often but they are great.

Verified Customer of World Tree Service, Inc., 33 of 455

10 Quality
Yes Loyalty
Perri S.

They were able to service the trees quickly. They were punctual and cleaned up amazingly.

The speed, a lot of other tree companies have people waiting for months down a line

Verified Customer of World Tree Service, Inc., 34 of 455

10 Quality
Yes Loyalty
Mike F.

I use them for all my tree service needs. I probably have used them eight or nine times.

The pricing is fair, they're responsive, knowledgeable, and just straightforward.

Verified Customer of World Tree Service, Inc., 35 of 455

10 Quality
Yes Loyalty
Sarah B.

They're very knowledgeable, trustworthy and do a wonderful job. They hire good people.

The knowledge

Verified Customer of World Tree Service, Inc., 36 of 455

10 Quality
Yes Loyalty
Sean C.

They listen to your needs, they have expert advice, and they do a really good job.

I guess their ability to communicate what they're going to do for you and understand your needs. They're very fair and they come on time.

Verified Customer of World Tree Service, Inc., 37 of 455

10 Quality
Yes Loyalty
W.B.

They do what they say they are going to do, when they say they are going to do it.

They are reasonable.

Verified Customer of World Tree Service, Inc., 38 of 455

10 Quality
Yes Loyalty
Andy A.

We've used them for several years and they're always informative and respectful.

I just really like the way they treat the trees. They listen to us, don't over or under trim, and they care about what we care about.

Verified Customer of World Tree Service, Inc., 39 of 455

10 Quality
Yes Loyalty
Joann G.

They're upfront, get the job done, clean up really well, and go the extra mile.

The owner was great.

Verified Customer of World Tree Service, Inc., 40 of 455

10 Quality
Yes Loyalty
Ellie K.

I would say that they did the job that I asked them to do and they did it well.

The service, they did what I asked them to do and they did it well.

Verified Customer of World Tree Service, Inc., 41 of 455

10 Quality
Yes Loyalty
Michael A.

I've recommended them to multiple people. They're reliable and do great work.

Just that they did a good job., we had a difficult tree and there were no issues getting it out.

Verified Customer of World Tree Service, Inc., 42 of 455

10 Quality
Yes Loyalty
Kate H.

They're knowledgeable, professional and the service is fast. I was satisfied.

They do everything well.

Verified Customer of World Tree Service, Inc., 43 of 455

10 Quality
Yes Loyalty
Robert R.

They're very friendly, efficient and worth the money. They were really great.

They were accessible and came out when needed. We didn't have to wait a long time. Their knowledge and the crew was great.

Verified Customer of World Tree Service, Inc., 44 of 455

10 Quality
Yes Loyalty
Helen M.

They had excellent pricing, excellent service, and they were very responsive.

Their attentiveness and responsiveness, they are local and we like to support local businesses. They were perfect.

Verified Customer of World Tree Service, Inc., 45 of 455

10 Quality
Yes Loyalty
Meaghan K.

They just did a great job. They cleaned up, communicated well and were safe.

I think just that they did great job.

Verified Customer of World Tree Service, Inc., 46 of 455

10 Quality
Yes Loyalty
Dr.Robert M.

They were prompt and courteous. They were a good value and did quality work.

I liked the quality of the work and the speed and efficiency of it getting the job done.

Verified Customer of World Tree Service, Inc., 47 of 455

10 Quality
Yes Loyalty
Rick B.

They did a great job. Tim is friendly. They were incredible and efficient.

They did a great job, cleaned up after they cut everything down and took their time.

Verified Customer of World Tree Service, Inc., 48 of 455

10 Quality
Yes Loyalty
Shari C.

They were prompt, professional, and they made our old tree look fantastic.

They did a beautiful job on the trees. They did a beautiful, natural job.

Verified Customer of World Tree Service, Inc., 49 of 455

10 Quality
Yes Loyalty
Jamie C.

I would say they are very personable and very attentive to what we needed.

They're prompt and very friendly.

Verified Customer of World Tree Service, Inc., 50 of 455

10 Quality
Yes Loyalty