Celebrating 46 years · Family-owned since 1980
PA HIC #PA027036 · Fully insured
(610) 429-4496
West Chester, PA · Est. 1980
Family-owned restoration for in-ground concrete and gunite pools across Southeastern Pennsylvania and Northern Delaware. An owner gives your estimate. Our own crews do the work.
Free consultation
The at-home consultation
We don't employ salespeople. Your consultation is a conversation with an owner about what your pool needs, why it needs it, and how to keep the work in good shape for years afterward.
David Callahan or his son-in-law George Knoeller II are the only people who come out for an estimate.
There's no sale to close during your consultation, so there's no pressure to close one.
No “today only” pricing and no appointment-only discounts. Take the time you need to decide.
We will never ask for a deposit while we're at your home.
What we do
Repairs and complete renovations on residential and commercial pools and spas — about 140 jobs a year across Southeastern Pennsylvania & Northern Delaware.
Full preparation, repair and resurfacing with Diamond Brite aggregate plaster, troweled smooth by hand and filled the same day.
Custom perimeter tile, coping, spa walls and step trim, rebuilt or installed to protect your plaster and keep the edge safe for swimmers.
We clean out and reseal the joint between coping and deck with polyurethane caulk, so water can't freeze and thaw its way under your tile and coping.
Don't need a full renovation? We reset or replace coping, repair tile, spa walls and skimmers, patch plaster (some patches underwater) and fix rust spots.
Not sure whether we do the work you need? Ask. If it involves the shell, tile, coping or plaster, we can probably help.
Ask about your poolBefore & after
New tile and coping, a rebuilt spa wall and a fresh plaster finish. Drag the handle to compare.
Drag, or use the arrow keys
BeforeAfterPlaster & color
A pool is seen from across the yard far more than from the edge. Size, depth, shade, sun and time of day all change how the water reads, so we help you choose for the view you'll actually live with.
From across the yard
Up close
Along the edgeThe most requested look, a slightly deeper and more natural blue, comes from light to medium gray plaster, not blue. Hand-troweled color always shows some lighter and darker areas. That's natural, and if it gives you pause, we'll suggest a colored pool to go see in person before you decide.
Our plaster, on paper
Why smooth? Acid-exposing shows off the quartz but leaves a surface that can turn abrasive over the years. Troweled smooth, the aggregate surfaces gradually with normal water chemistry, so the finish stays comfortable and gains strength.
*Offered by SGM when the warranty form is completed within 30 days of application and monthly water-maintenance printouts are kept. National Plasterers Council member since 2003.
15
Employees, most with us 10 to 20 years
Our crews
An applicator's experience shows directly in a finished surface. Ours learned the trade inside this company, often starting by prepping pools for plaster.
Led by foremen Francisco and Paul, plastering with us since 1999 and 1996
Three trowelers and two mixers round out the crew. Everyone else on it has been with the company since at least 2005. They plaster 40–60 residential pools a year and handle plaster repairs: steps, cracks, pop-offs and rust spots.
Led by Ramon and Marco
Ramon has been with us 26 years and installing custom tile, coping, stone and pavers since 1999, including structural bond-beam repairs. Marco started in 2002 and specializes in spa walls, cantilevered decks, resetting stone coping and pavers. Each works with a partner of 10+ years.
Recent work
Plaster, tile, coping and spa work by our own crews. Select a photo to enlarge.
What to expect
Tell us about your pool. Anna Callahan or George Knoeller II will call you back directly to set a time.
David or George looks at the pool with you, explains what's needed and why, and answers your questions.
No contract on the spot, no expiring discount, no deposit at the visit.
Long-tenured Callahan employees with the training and tools for the job. Never subcontracted.
Questions
The more you understand about the work and why it's needed, the easier it is to compare estimates and take care of the finish afterward.
Yes. We repair and renovate all types of in-ground concrete and gunite pools and spas, whoever installed them, for both homes and commercial properties.
Southeastern Pennsylvania and Northern Delaware, from our base on Phoenixville Pike in West Chester.
Since 2018 we only install Diamond Brite aggregate plaster (not the Watercolors line), prepped with Diamond Brite Bond Kote. We trowel it smooth instead of acid-exposing it, so the surface stays comfortable underfoot while normal water chemistry gradually exposes the aggregate over time.
Hand-troweled plaster naturally varies, and colored plaster shows it more. The National Plasterers Council notes colored plaster may show streaks, uneven color and checking; these are normal and not defects. If that worries you, see a colored pool in person before deciding.
SGM offers a 10-year cost-of-material warranty on Diamond Brite pools when the warranty form is completed within 30 days of application and monthly water-maintenance records are kept.
Yes. Our Pennsylvania Home Improvement Contractor license number is PA027036, and we're fully insured. Ask and we'll send a copy of our certificate of insurance.
Never. Consultations are free, and we don't carry contracts or ask for a deposit during the visit.
46 seasons and counting
Fax (610) 429-9247
