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Location and Projects

Address
3435 R-e Thousand Oaks Blvd #4871, Thousand Oaks, CA, 91362
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Custom Derian Pools

About
Swimming Pool Construction, Hillside Pools, Infinity Pools, Caissons Landscape Design, Masonry, Outdoor Fireplaces, Water Features, Retaining Walls, Driveways BBQs. Infinity Pools, Hillside Pools, Landscaping, BBQs, Outdoor Fireplaces, Shade structures, Pergolas, Landscaping, Masonry, Driveways, Pool Houses, Cabanas, Pool service, Landscape Design,Endless Pools, Spas, Gazebos

Description
Derian Pools & Construction designs and builds swimming pools, backyard entertainment areas, Outdoor Fireplaces, Outdoor BBQs and Kitchens, Landscaping, Shade structures, Entryways, Driveways, Courtyards Fountains, Retaining walls, etc.

All work on our sites & albums, including but not limited to: photos & designs are the intellectual property of Derian Construction, Derian Pools & Kerri McCoy. Redistribution & copy or use of these photos without the permission of these owners is prohibited. (c) Derian Construction 2013
General Information

If You Can DREAM it...... We Can Build It!

From BuildZoom:

Custom Derian Pools at 3435 R-e Thousand Oaks Blvd #4871, Thousand Oaks, CA 91362, held a Swimming Pool Contractor license (#377721) with the California contractors license board with an expiration date of 12-31-2013. We last verified the license was inactive on 05-21-2026.

Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.

If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our project planner to be easily matched to qualified, licensed professionals in your area.

Custom Derian Pools Contact Information

Phone: (818) 414-9929
Address: 3435 R-e Thousand Oaks Blvd #4871, Thousand Oaks, CA 91362

Custom Derian Pools Thousand Oaks

Quality

Alert*
Pro tip: We generally recommend hiring a contractor with a score higher than 95.
*No active license on file. If you are Custom Derian Pools, log in and update your license info in the “Edit Profile” tab.

Activity

14 projects
2025
8 projects
2024
11 projects
2023
Our building permit records indicate that Custom Derian Pools has worked on at least 33.0 projects over the past 3 years.

This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.

Experience

25 projects
Pool and spa constructions
Analyzing permits over the last 4 years shows that Custom Derian Pools mostly works on pool and spa construction projects.

Pricing

11 projects
< $5k
3 projects
$5k-$20k
16 projects
$20k-$50k
2 projects
$50k-$100k
Value Not Public: 11.0 projects
The typical size of their permits is approximately $20,000. This graph shows the distribution of these job values.
Pro tip: For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.

Custom Derian Pools Reviews
2.5 out of 5 stars, based on 9 reviews

  • By A C.
    November 10, 2020
    pool, spa, bbq, hardscape, fountain
    $150,000

    If I could give zero stars, I would. We hired Derian Pools in the summer of 2019 to do a large pool and hardscape project. Buyer beware because the materials and craftsmanship of Derian's work is shoddy and subpar. Kerri McCoy is extremely difficult to deal with. Doesn't care about client satisfaction, poor communications skills, argumentative and even worse, only cares about getting paid to the point that she used threatening language. We have since learned that she cut corners in various areas of work. For example, Derian built a large fountain on our terrace but undersized the pump and used the cheapest grade copper piping which a year later is leaking. Derian installed a water tank (not in accordance with the spec) -- used the cheapest and smallest size which provided only 2 minutes worth of hot water. We had to hire another plumber to replace it with a larger tank. Stay clear of Kerri and Derian, these people will not bring joy to you or your project.

  • By Susan D.
    November 6, 2020
    Pool remodel and add waterfall
    $80,000

    Derian deserves no star at all. There is not enough room or time to describe all the horrific problems we encountered on our pool remodel. We were charged five hundred dollars initially for permits. After six months of fighting them on their shabby work and botched design, we found the permit canister empty. When we inquired about never seeing a building inspector, Derian said the inspector arrived very early in the morning. We called the city,, and no permits had been pulled for our job.
    The city shut all work down in the seventh month. The city asked Derian for legal structural and design plans. There were none. Building codes and safety requirements had not been followed. Our huge waterfall had much less rebar and concrete than required by the county. Nothing was built to code, making it a dangerous safety hazard. The structure was built too close to the property line. As we contacted lawyers to sue, the county inspector let us know that he would be our best witness in court and he had pictures of Derian's shoddy work. Rather than end up in court, Derian agreed to tear out most everything and start over. As we approached a year, we realized half the pool's electrical wiring had been covered with concrete and lost. There are too many problems to cover. We ended up losing half the pool lights. The waterfall is not aligned with the lower pool so water slashes out of the pool into the yard.
    The employees were treated terribly and there was constant screaming. There was no portable toilet provided for a full year. After a year, we were glad to be rid of them and hired another company to come in and fix what we could.
    The whole experience was a nightmare.

    Read more
  • By Ray M.
    October 16, 2020

    This outfit remodeled my pool in 2005. Worst experience I have every had with a contractor. Kerri tried several times to cut corners on what was agreed to in the contract. It was a battle from start to finish. Then, 3-4 years in, the tile on the pool started to pop off, the plaster started to chip and peel and 5 years in the concrete deck started breaking off in chunks. (They installed the rebar too near the surface of the concrete). As others have noted, this outfit changes names and files bankruptcy to avoid liability on shady dealings and shabby work.

  • By Sharon D.
    April 9, 2020

    Wow I see things haven't changed with Kerri McCoy. When we contracted her to build a pool for us a while back she was a nightmare. First of all we thought we were getting Derian Pools to build our pool, but they sold the company to this Kerri person. We didn't know that until we tried to get Deian Pools to fix the many mistakes they made on our pool. We had to file a complaint with the State of California twice to get her to fix the issues we had with our pool. Kerri is a very dishonest, angry person. I can't believe she is still in business. Run, don't walk away from this person. The State of California should show how many complaints she has had against her, but they don't.

  • By Becky
    August 16, 2018
    Pool and spa project
    $235,000

    My experience with Derian is that they are a horrible company, and I wonder about the validity of the other reviews, as Kerri has a business practice - one I rejected -to barter for goods and discounts.

    Derian Pools abandoned our project after Derian’s shotcrete sub had a cement hose literally explode with so much force that it showered cement all over our home, all the way across the street where it hit our and other parked cars, and covered front to back our metal roof where the cement was allowed to dry. Derian refused to turn the damage over to their insurance carrier and chose to abandon the job.

    When Derian pulled their workers, they lied. They removed their tools saying Kerri had told them to straighten up but they would be there the following morning. They never showed up again. Kerri also sent an email saying she would see us next week - also a pretense. Further, they left a mess of plywood from the backyard out to the sidewalk for someone else to clean up.

    Now that Derian has abandoned the job, they are playing games with their attorney who they had contact me, claiming the mediation required under the contract can’t be scheduled because he hasn’t been in contact with Derian and - in a huge firm - he isn’t available for weeks.

    And this last issue wasn’t the only issue. When our project started, Kerri almost immediately began to indicate that doing the job would require “change orders”. By way of one example - waterproofing the pool for tile and infinity troughs so they did not leak was a “change order” in Kerri’s mind. All of that was in the contract. Any “change order” that Kerri indicated needed to be done was a direct result of her saying the pool would leak without us paying more money, and had nothing to do with the plans changing or us changing our minds.

    Kerri is fond of saying “the contract doesn’t say that”. True - the contract does not say “waterproof so the pool doesn’t leak”, but, prior to Kerri, I wouldn’t have thought it needed to. After all — “waterproofing”.

    Kerri also demands payments when they are not due, and in this case she says the clear language of the contract, for example “all steel” installed, didn’t mean all steel but - according to Kerri - only spa steel. She also demands partial payments when the contract not only does not require them but doesn’t even mention them.

    Kerri is generally foul tempered when any small issue arises, becoming aggressive and out of control. As a case in point, Kerri was factually incorrect about the function of a pool cover. When I tried to explain, she simply would not listen, scoffed, mocked and was generally unprofessional. When I pulled the website up and played the video, she talked over the video, continuing to claim she was correct. I restarted the video and asked her to listen to the commentator’s description, which clearly demonstrated Kerri was incorrect. She then raised her voice and repeatedly said “you just keep backing me into a corner”, and threw and bounced a pencil off the table. It was a bizarre display.

    In another instance, my preference for 2 larger steps leading down to a deck rather than 3 narrower steps became a multi hour argument, and finally required the engineer to intercede and, based on Kerri’s demand, sign a document for an item that had no engineering purpose whatsoever.

    Kerri changes the design plan telling you to “trust” her and that it will be better. It became apparent to me that the changes all financially benefited Kerri.

    Additionally, I assisted one of Kerri’s subs who needed an assistant. That assistant subsequently worked for me. Again Kerri became angry, demanded her sub never use the assistant again on any project or Kerri would fire the sub. Her position was that the assistant had been disloyal to her by working for me, and that she made her living adding a percentage to all work done. She also insisted that I apologize to her sub for hiring a person I originally recommended.

    I told Kerri I preferred Pentair equipment from the beginning. Kerri pushed for Jandy because of the relationship - and I believe kickback - she has. When I stuck with Pentair and asked Kerri about equipment functioning as the pool was intended to, Kerri indicated that was now up to me. Kickbacks happen, but not doing your job as a professional because there isn’t one coming, is not reasonable.

    Billy is the face of the company for a reason, but after the contract is signed, the attitude is a massive shift.

    I checked the other person’s review and Kerri did file bankruptcy. That fits with my experience. Small claims is a small amount of money. Someone not paying it is small minded. I have paid Kerri more than $100,000 - including $40,000 for future sub payments and $35,000 for “all steel” which is still not all installed . As such, it would seem if the job is large or small, I would think twice about hiring Derian.

    Read more
  • By Beverly F.
    July 9, 2018

    Derian built a pool, spa, 3 pergolas and did landscaping in our yard. They did an excellent job and Kerri was very knowledgeable and came up with solutions to our hillside project. They were quick and cleaned up the site every day since we had dogs. The result was fantastic and I recommend them for anyone building a back yard project.

  • By Anonymous
    December 21, 2017
    Build Pool
    $75,000

    We had a pool installed by Derian Quality Pools (Kerri) and it looked nice at first. In time it a design flaw was revealed and she chose not to try and fix it. After a judgment in small claims was awarded she filed bankruptcy instead of paying the fine. See Court #9:13-bk-11649. I would be very wary of someone who does not stand behind their work.

  • By Haley M.
    May 3, 2015
    Swimming pool, spa, concrete work, veranda as well as two waterfalls & tiki bar
    $350,000
    Highly Recommend Derian Pools

    Love Derian Pools. They did an excellent job on my project. My backyard looks phenomenal and I highly recommend them to everyone looking for a five star contractor!

  • By Anonymous
    April 6, 2015
    new pool and BBQ
    $169,000
    270 days

    We just completed a new pool, BBQ, project with Derian. We couldn't be happier. There were many challenges with our site due to its hillside location. We weren't sure if a pool was possible in our yard. The design came out better than we thought. The crews were professional and cleaned up the site every day. There were some delays in the construction but they were mainly due to the challenges of working on the hillside. My husband and I have worked with many contractors over the past few years and I can say that this was the smoothest process out of all of them. We have received many compliments on our yard. People cant believe that we put a pool in the area we did. Excellent process from start to finish.

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Building Permits by Custom Derian Pools

Sort by: Notable Notable | Date Date | Job Value Job Value
Residential electrical permit
2025-02-05
Electrical for: new pool (and spa) with baja step sq ft: 390 engineer: pool engineering inc. do not gunite until: pre-gunite inspection is approved. no pool equipment block wall. do not pour deck until: pool electric groundwork and pool gas line rough and pool decking/bonding are approved. do not plaster or fill pool until: pool wiring and pool fence and gate are approved. do not use ... see more
Valuation:
N/A
Permit #:
ELE-2025-00257
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential building permit
2025-04-14
New pool (and spa) with baja step sq ft: 390 engineer: pool engineering inc. do not gunite until: pre-gunite inspection is approved. no pool equipment block wall. do not pour deck until: pool electric groundwork and pool gas line rough and pool decking/bonding are approved. do not plaster or fill pool until: pool wiring and pool fence and gate are approved. do not use swimming pool un... see more
Valuation:
N/A
Permit #:
BLD-2025-00263
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential plumbing permit
2025-02-05
Mechanical for : new pool (and spa) with baja step sq ft: 390 engineer: pool engineering inc. do not gunite until: pre-gunite inspection is approved. no pool equipment block wall. do not pour deck until: pool electric groundwork and pool gas line rough and pool decking/bonding are approved. do not plaster or fill pool until: pool wiring and pool fence and gate are approved. do not use... see more
Valuation:
N/A
Permit #:
PLM-2025-00127
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Supplemental permit to 24030-20000-07078 to show both sunkin area in one plan per inspectors request. *********** no fee. dept error ******************
Valuation:
N/A
Permit #:
24030-20003-07078
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Residential plumbing permit
2024-08-22
Plumbing for new pool (and spa) sq ft: 325 with baja shelf. pool equipment wall 5 x 12. engineer: pool engineering inc. do not gunite until: pre-gunite inspection is approved. for pool equipment block wall obtain: wall footing inspection approval and grout lift inspection approval do not pour deck until: pool electric groundwork and pool gas line rough and pool decking/bonding are app... see more
Valuation:
N/A
Permit #:
PLM-2024-00745
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential electrical permit
2024-08-22
Electrical for new pool (and spa) sq ft: 325 with baja shelf. pool equipment wall 5 x 12. engineer: pool engineering inc. do not gunite until: pre-gunite inspection is approved. for pool equipment block wall obtain: wall footing inspection approval and grout lift inspection approval do not pour deck until: pool electric groundwork and pool gas line rough and pool decking/bonding are a... see more
Valuation:
N/A
Permit #:
ELE-2024-00969
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential building permit
2024-08-22
New pool (and spa) sq ft: 325 with baja shelf. pool equipment wall 5 x 12. engineer: pool engineering inc. do not gunite until: pre-gunite inspection is approved. for pool equipment block wall obtain: wall footing inspection approval and grout lift inspection approval do not pour deck until: pool electric groundwork and pool gas line rough and pool decking/bonding are approved. do not... see more
Valuation:
N/A
Permit #:
BLD-2024-01279
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Swimming-pool/spa
2025-06-13
New 16 x 28 swimming pool with baja and 7 x 9 spa per la city standard plan #268
Valuation:
$45,000
Permit #:
25047-20000-00302
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2025-01-15
New 24 x 45 1 pool supported on piles. all work per engineering
Valuation:
$80,000
Permit #:
24047-20000-01372
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2024-10-29
New pool & spa per standard plan 268 and engineering detail 552. comply with department order effective date 03/03/2021. permit will expire 30 days from issuance date
Valuation:
$45,000
Permit #:
24047-20000-01507
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2024-12-05
New 40'-4 x 18'-7 swimming pool w 9'-0 x 9'-0 spa per standard plan # 268 & engineering details
Valuation:
$45,000
Permit #:
24047-20000-01535
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2025-06-08
Proposed new swimming pool w spa per city standard plan #268
Valuation:
$40,000
Permit #:
25047-20000-00280
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2025-07-18
(n) 14'x 29 swimming pool with attached 7 x 10 spa per la standard plan #268 and engineered details
Valuation:
$45,000
Permit #:
25047-20000-00523
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Suppl. permit to 24030-20000-07078 to revise the grading permit
Valuation:
$51
Permit #:
24030-20002-07078
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2025-01-07
Suppl. permit to 24047-20000-01538 to relocate pool equipment
Valuation:
$501
Permit #:
24047-20001-01538
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2025-02-18
Suppl. permit to 24047-20000-01568 to addition enclosure
Valuation:
$501
Permit #:
24047-20001-01568
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Supplmental permit to 24030-20000-07088 to include sunken seating area excavation
Valuation:
$52
Permit #:
24030-20001-07088
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2024-12-02
Proposed new 46'-4 x 11'-9 swimming pool with 9 x 7'-6 spa per city standard plan #268 & suppl engr details
Valuation:
$45,000
Permit #:
24047-20000-01538
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2023-01-14
New 17 x 40'-8 swimming pool and 7 x 7 spa within per standard plan #268 and engineer details
Valuation:
$40,000
Permit #:
22047-20000-00108
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Swimming-pool/spa
2023-08-04
Supp. to permit 22047-20000-01750 to relocate the pool cover and the spa. [new 11'-6 x 25'-6 pool/spa per la city standard plan #270 and new concrete deck]
Valuation:
N/A
Permit #:
22047-20001-01750
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A