---
title: "Keystone Granite — Countertop | Houzz"
canonical_html_url: https://www.houzz.com/professionals/countertop/keystone-granite-pfvwus-pf~881378309
markdown_url: https://www.houzz.com/md/professionals/pf~881378309.md
entity_type: LocalBusiness
business_name: "Keystone Granite"
category: ["Countertop"]
image: https://st.hzcdn.com/fimgs/285333a702597584_7709-w400-h400-b0-p0--.jpg
address: "18975 Marbach Lane suite 291, San Antonio, Texas 78260, United States"
latitude: 29.7026
longitude: -98.4759
phone: "(210) 651-1786"
website: http://www.keystonegranite.com
rating: 5
review_count: 6
best_of_houzz_awards: 1
followers: 11
last_updated: 2026-08-16
---

# Keystone Granite

Original Houzz profile: [Keystone Granite](https://www.houzz.com/professionals/countertop/keystone-granite-pfvwus-pf~881378309)

## Professional summary

- **Primary category:** Countertop
- **Location:** San Antonio, TX
- **Serves:** San Antonio, New Braunfels, Timberwood Park, Live Oak, Bulverde, Garden Ridge, Shavano Park, Hollywood Park, Hill Country Village
- **Houzz rating:** 5.0 out of 5 (6 reviews)
- **Best of Houzz:** 1 award (2018), for Service.

## About

### Houzz Badges

- Star Houzzer
- Recommended on Houzz
- 100 Ideabook Saves

Keystone Granite is based on a rock solid foundation, a marriage. Owners John and Lynn Monahan have, for the past 40 years, worked with the residential and commercial markets doing a combination of solid surface, natural stone and engineered counter tops. Their focus has been on providing a combination of elegance and excellence towards the counter top and stone industry in San Antonio and the surrounding areas.

### Services Provided

- Custom Countertops
- Backsplash Installation
- Countertop Installation
- Countertop Sales
- Quartz Countertops
- Granite Countertops
- Natural Stone Countertops
- Marble Countertops
- Stone Installation

### Areas Served

- San Antonio
- New Braunfels
- Timberwood Park
- Live Oak
- Bulverde
- Garden Ridge
- Shavano Park
- Hollywood Park
- Hill Country Village

### Typical Job Cost

$1500.00 - 50,000

## Business Details

| Field | Value |
| --- | --- |
| Business Name | Keystone Granite |
| Address | 18975 Marbach Lane suite 291, San Antonio, Texas 78260, United States |
| Phone | (210) 651-1786 |
| Website | http://www.keystonegranite.com |
| Followers on Houzz | 11 |

## Contact

- **Houzz profile:** [Keystone Granite](https://www.houzz.com/professionals/countertop/keystone-granite-pfvwus-pf~881378309)
- **Website:** http://www.keystonegranite.com
- **Phone:** (210) 651-1786

## Credentials

- **Best of Houzz:** 1 award (2018), for Service.

## Reviews

**Overall rating: 5.0 out of 5 — 6 reviews**

### All 6 reviews

**★★★★★ — Buttrum Construction, March 2018**

> We have worked with other granite companies in the past, but ever since we started working with Keystone, we will never use anyone else. Keystone has done more than 20 homes for us in the last two years and they do a great job every time. They have fair prices, clean facility, impeccable craftsmanship & A+ Installers. John Manley has been a great salesperson to work with and makes the process quick and painless.

**★★★★★ — Mike Isbell, Dec. 2017**

> I am a custom home builder and have used Keystone Granite for several years for all my projects. They have proven to provide a quality product with excellent service and followup. It's not just Keystone's product, but also the dedicated people who provide these services. My customers have all commented on Keystone's professionalism and eagerness to assist them in their choice of granite.

**★★★★★ — Creative Homes, Dec. 2017**

> Pricing and customer service is second to none.  I had used at least 6 other granite / composite counter top suppliers / fabricators and Keystone is the best.  Great selections to choose from for my customers.   John Manley takes a personal approach to each and every one of my clients and discusses all options available for counter top selections.
>
> Installers are professional and rarely do I have a call back.  Could not be more please with a supplier.

**★★★★★ — Kim Kenney, Allied ASID, Dec. 2017**

> Lynn did an excellent job listening to the look we wanted as well as our budget, assessing our needs and making it all work beautifully!

**★★★★★ — Nancy Ober, Dec. 2017**

> Keystone Granite has a very large selection of top quality granite.  When you walk in the door of the business, you are greeted with a friendly smile and immediate assistance.  John & Lynn are very helpful and made a great recommendation to us.  Although we have not completed our renovation yet, when we are ready - we will MOST DEFINITELY make our purchase with Keystone Granite.

**★★★★★ — User, Feb. 2016**

> We love working with Keystone Granite. They have great products that are of good quality. They resolve issues quickly if they arise. Their customer service is excellent!

## Selected projects

- [Model Home - Shavano Park](https://www.houzz.com/hznb/projects/model-home-shavano-park-pj-vj~2789477)
  - Location: Shavano Park, TX
  - Photos: 2
- [Savannah Court](https://www.houzz.com/hznb/projects/savannah-court-pj-vj~2840363)
  - Location: San Antonio, TX
  - Photos: 5
- [Model Home - Menger Springs](https://www.houzz.com/hznb/projects/model-home-menger-springs-pj-vj~2789490)
  - Location: Boerne, TX
  - Photos: 5
- [San Antonio, Texas](https://www.houzz.com/hznb/projects/san-antonio-texas-pj-vj~2840106)
  - Location: Not specified
  - Photos: 6
- [Canyon Lake](https://www.houzz.com/hznb/projects/canyon-lake-pj-vj~2840465)
  - Location: Not specified
  - Photos: 5
- [House in Vintage Oaks (2017)](https://www.houzz.com/hznb/projects/house-in-vintage-oaks-2017-pj-vj~2840433)
  - Location: Not specified
  - Photos: 3
- [House in Havenwood (2018)](https://www.houzz.com/hznb/projects/house-in-havenwood-2018-pj-vj~2840126)
  - Location: Not specified
  - Photos: 9
- [Vintage Oaks - Granite Countertops](https://www.houzz.com/hznb/projects/vintage-oaks-granite-countertops-pj-vj~2834062)
  - Location: San Antonio, TX
  - Photos: 9
- [Echo Mountain Granite](https://www.houzz.com/hznb/projects/echo-mountain-granite-pj-vj~2833904)
  - Location: Not specified
  - Photos: 10
- [Ranch House in Concan Texas](https://www.houzz.com/hznb/projects/ranch-house-in-concan-texas-pj-vj~2892409)
  - Location: Not specified
  - Photos: 1
- [House in Terrell Hills](https://www.houzz.com/hznb/projects/house-in-terrell-hills-pj-vj~2652091)
  - Location: Terrell Hills, TX
  - Photos: 2
- [Vintage Oaks](https://www.houzz.com/hznb/projects/vintage-oaks-pj-vj~2840151)
  - Location: Not specified
  - Photos: 2
- [Ranch House](https://www.houzz.com/hznb/projects/ranch-house-pj-vj~2840043)
  - Location: Not specified
  - Photos: 3
- [The Havens](https://www.houzz.com/hznb/projects/the-havens-pj-vj~2888906)
  - Location: Not specified
  - Photos: 7
- [Grand Hyatt- Rojo Bar](https://www.houzz.com/hznb/projects/grand-hyatt-rojo-bar-pj-vj~2840075)
  - Location: Not specified
  - Photos: 2
- [Thunder Mountain Granite Kitchen](https://www.houzz.com/hznb/projects/thunder-mountain-granite-kitchen-pj-vj~2946162)
  - Location: New Braunfels, TX
  - Photos: 9
- [Colonial Cream Kitchen](https://www.houzz.com/hznb/projects/colonial-cream-kitchen-pj-vj~2938407)
  - Location: Boerne, TX
  - Photos: 5
  - Description: Another gorgeous kitchen out of Colonial Cream granite with a bevel edge; featuring a farmhouse style apron sink.
- [Oak Park Kitchen](https://www.houzz.com/hznb/projects/oak-park-kitchen-pj-vj~2915701)
  - Location: San Antonio, TX
  - Photos: 8
  - Description: This fantastic kitchen in Oak Park is highlighted by a Calcutta White Quartzite Island and finished with MetroQuartz Glacial on the perimeter. An absolutely stunning Kitchen.

[See all 18 projects](https://www.houzz.com/professionals/countertop/keystone-granite-pfvwus-pf~881378309)

## Ideabooks

- [Granite Slab Photos](https://www.houzz.com/ideabooks/105063237/list/granite-slab-photos) — 11 ideas
- [Countertop Material Sample Photos](https://www.houzz.com/ideabooks/98587466/list/countertop-material-sample-photos) — 4 ideas
- [Bathroom Countertops](https://www.houzz.com/ideabooks/98587112/list/bathroom-countertops) — 5 ideas
- [Kitchen Countertops](https://www.houzz.com/ideabooks/98589858/list/kitchen-countertops) — 20 ideas
- [Kitchen Islands](https://www.houzz.com/ideabooks/104948790/list/kitchen-islands) — 5 ideas

[See all 5 ideabooks](https://www.houzz.com/ideabooks/users/keystonegranite)

---

*Source: Houzz professional profile. Reflects the profile as of 2026-08-16.*