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Guaranteed Excellence

Guaranteed Excellence Denver | Dream the Amazing!


Guaranteed Excellence


3287 S Wolff St
Denver Colorado 80236
United States


(303) 922-7199

Guaranteed Excellence offers outdoor design and construction services in the Denver Metro Area. Mark Powell founded this Colorado company in 1994. The company is devoted to horticulture, and has a passion for plants. They specialize in building landscapes that are both visually appealing and easy to maintain. With a thorough knowledge of the local environmental conditions, Guaranteed Excellence aims to create outdoor spaces that are inviting and sustainable. The business can be contacted at 303-922-7199 for inquiries or to schedule a consultation.


About Denver

Denver ( DEN-vər) is a consolidated city and county and the capital and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the United States and the fifth most populous state capital. It is the principal city of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area and the first city of the Front Range Urban Corridor. Denver is located in the western United States, in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains.



Client Reviews

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Matthew F.

Landscape Design Denver

After a few back and forths with the designer we finally locked in on a plan. Marco and his crew showed up and completed the job with success. The crew was large, the complicated job was done within a day. Cleared tons of weeds, created a path, demo’d previous pavers, and added beautiful, paver patio. Marco, the crew lead, was very helpful and extremely nice. I recommend hiring this company for your next landscaping job.

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Nicci J.

Tree Care Denver

Where to begin in describing my satisfaction with Guaranteed Excellence. We just built a new home, and as anyone knows, the outside of the home is just as important as the details inside the home. Angie met me MONTHS before we were ready to lay landscaping to design the outside of our home. She kept in mind our overall design style (modern farmhouse), met our HOA guidelines, and came with suggestions that met my budget. When it came time to finally lay the irrigation, sod, and additional elements the team navigated a changing timeline due to builder interruptions. They were patient and understanding! When it did come time for install, Rafa (owner) and his team were onsite daily ensure each detail was attended to – soil grade, tree placement, even taking the time to educate us on how to drain the irrigation system ourselves. Our project isn’t even complete and I already LOVE every element (especially my garden boxes). I cannot recommend Guaranteed Excellence and the work they do more!

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Adam S.

Backyard Design Denver

I assume you’re here reading these reviews to determine whether to use this company. I would HIGHLY recommend them. I just had my backyard done with them. They were the best price, their service was excellent, and they showed up on time and did what they said they were going to do. I dealt with Angie and Marco and couldn’t have had a better experience. They listen to my feedback while also guiding me on what would be smart long term. This was really the differentiator for me. When starting this project I actually had eight quotes provided to me and guaranteed excellence was the best priced. I didn’t do anything crazy with my backyard so honestly I think anybody could have completed the job, but I am not confident anyone else would’ve done it so quickly and with such good communication. I was so pleased with their work that I created a Google account literally just to leave this review. Well done GE, thank you!!

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Hiemi H.

Landscapers Denver

We used Guarantee Excellence landscape about 10 years ago for our backyard and they did excellent job back then. There were many times I wish I could recall their contact information for our landscape needs because other landscapers we used didn’t measure up to their performance. However, out of the blue we received one of their mailers and we hired them to regrade our front lawn, install a retaining wall, replace and reseed the lawn with lower water required seeds and install water efficient sprinkler heads. They did a great job at a very reasonable price and will use them again in the future.

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Denise J.

Patio Contractor Denver

Marco Alvarado and his team just completed a large patio area with pavers, and it looks GREAT! They are really good at planning a project and executing it in a thoughtful, efficient manner. Not only does it look beautiful, but it will also drain water away from our house much more effectively. They are careful, precise workers who take their projects very seriously. They have done several other drainage mitigation projects for us in the past, as well as our regular pruning. We believe their prices are quite competitive. What is different with Guaranteed Excellence is that you are getting Rafael and Marco’s expertise backing their project bid. They will propose the most reasonable solution to solve your landscape issue. We are happy customers!

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David S.

Denver Landscape Design

Had an amazing experience with Guaranteed Excellence! The crew was incredibly thorough and fast and did a beautiful job on our landscaping installation. Angie was wonderful to work with and helped us to design a project that freshened up our yard while staying within our budget. I would absolutely use them again and wholeheartedly recommend for any landscaping/hardscaping project!

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Tim J.

Landscaping Denver

Jerome, Angie, Rafael, Marco and the team at Guaranteed Excellence is fantastic!! Their design, creativity, experience, professionalism and communication are the best we have experienced with a project like this. They were thoughtful about every detail, talked with us daily about progress, collaborated on decisions, executed the work with quality/integrity and were amazing about making a couple tweaks along the way. I highly recommend Guaranteed Excellence for any landscaping project, big or small. It's an awesome experience all the way around.

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Kody A.

Xeriscape Denver

100% satisfied with my xeriscape project that was completed yesterday. The entire process from designing to install went smooth, and most importantly was affordable for my budget. Would highly recommend for landscape design/projects - we love our new yard!

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Darcy A.

Denver xeriscaping

They installed xeriscaping for my entire front and back yards. They were prompt and did what they promised. They were also caring enough to follow up on their own and make sure all was well. The team of Angie and Marco came recommended and I wholeheartedly agree!

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Edmund K. H.

Irrigation Denver

G.E. did a terrific job of laying in border stones, taking down several stumps, installing a tree and several bushes, adding an irrigation drip line, bringing in a large amount of soil prep material, removing a LOT of rocks in the soil and prepping a very large area for native grass seeding. They made a tough job look easy, and they made it look great. These guys are great.

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Hal S.

Landscape Denver

Great design and installation. Were punctual, efficient and cleaned up afterwards. Angie and her team will be my “go to” for future landscape work.

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Denver Landscaping Company

I've worked with Guaranteed Excellence for over 15 years and every job has been great. I use them for all my landscaping needs and don't even bother to call anyone else at this point.

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Tina W.

Denver Tree Landscaping

Guaranteed excellence is the best in town!! I will never use anyone else!!! So professional dependable and the best prices around

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Jerome G.

Guaranteed Excellence

They’ve been great I can’t wait to see the finished product

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