# Celtic Services, Inc Powerwashing **Trade:** Specialty Services · **Address:** 599 Old Falmouth Rd, Marstons Mills, MA 02648 · **Phone:** (508) 360-0755 · **Website:** https://celticpowerwashing.com/ · **Languages:** English **Rating: 4.8/5** (medium confidence) — from 49 reviews across 3 sources. 100% of sentiment-scored reviews read net-positive. Last 6 months: 2 reviews, 0 negative. ## The honest read Celtic Services, run on Cape Cod by owner Jack Walsh, has turned into the name locals reach for when a roof turns orange-green with Cape Cod moss and lichen — a recurring theme across dozens of reviews is a roof or shingles that "looks brand new" after Jack's team cleans it, often photographed for an insurance company demanding the moss come off within a set deadline. The review history runs unbroken from 2021 through the present — 49 reviews, every one of them five stars — and describes the same experience again and again: Jack personally returns calls and quotes within hours or a day, shows up when promised, and leaves the property, whether it's a house, roof, deck, fence, or outdoor furniture, cleaner than he found it. Several reviewers are repeat customers who've used Celtic multiple times over the years, and more than one mentions Jack's crew taking care around gardens, plantings, and conservation land while working. A handful of reviews describe insurance-driven jobs — moss removal ordered by a homeowner's insurer with a tight deadline — where Jack rearranged his schedule, including delaying an end-of-season shutdown, to get the work done in time. There's no complaint in the written record to flag. For roof, siding, deck, or gutter cleaning on Cape Cod, Celtic Services has one of the more consistent track records in the area — the main thing worth confirming up front is scheduling, since demand for insurance-deadline jobs can run tight in season. **Strengths:** - Fast response — Jack personally returns calls and quotes quickly - Roof moss removal — repeated praise for restoring moss-stained roofs - Handles insurance deadlines — rearranged schedule for time-sensitive jobs - Careful around landscaping — reviewers note care near gardens and conservation land ## Claims & citations Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication. - Jack Walsh personally returns calls and provides quotes within hours or a day _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pkdU1XUkRaRkJoVFVaVlYxZEJkRTluVEZwTmFuYxAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CAIQACodChtycF9oOjduMWRDZFBhTUZVV1dBdE9nTFpNanc%7C%7C?hl=en) — “5★ Jack was incredibly responsive in returning calls and providing quotes. The work done was professional, done when he said it would be do…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNwZ1p5aXdBRRAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgICpgZyiwAE%7C%7C?hl=en) — “5★ Celtic Services, Inc responded to my inquiry within a few hours. They were able to come to my home within a day or two to give an estimat…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNPdThHZlhREAE!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgICOu8GfXQ%7C%7C?hl=en) — “5★ I am overjoyed with how clean and beautiful my home looks. Celtic Services (Jack) did an amazing job removing mold from the house and de…” - Reviewers repeatedly describe roof moss and lichen cleaned to look brand new _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2paRmJFMXFaRkEyVGtnME1WRTBNMU5zU1hsQmRXYxAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CAIQACodChtycF9oOjZFbE1qZFA2Tkg0MVE0M1NsSXlBdWc%7C%7C?hl=en) — “5★ My roof was covered with Cape Cod moss and stains.They did a fantastic job cleaning it. It looks brand new I highly recommend them.” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURfM3R1MlFREAE!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgID_3tu2QQ%7C%7C?hl=en) — “5★ Celtic Services is the best! Before Celtic my roof looked like it needed to be replaced. Now it looks brand new. They also cleaned my g…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURPbmVyWllREAE!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgIDOnerZYQ%7C%7C?hl=en) — “5★ I had an orange moss/fungus growing on my asphalt shingle roof. I tried to clean it myself with a few different cleaning fluids, but actu…” - Handled insurance-mandated moss removal on a tight deadline, including delaying a seasonal shutdown _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2t4bWJFOUlZbFJCTjNGeWRsaFFOM1ZTUXpoVk4wRRAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CAIQACodChtycF9oOkxmbE9IYlRBN3FydlhQN3VSQzhVN0E%7C%7C?hl=en) — “5★ On 12/3 I was contacted by our insurance company saying moss needed to be removed from our house in Sandwich within 30 days. I contacted …” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTURJdElybGJ3EAE!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgMDItIrlbw%7C%7C?hl=en) — “5★ Very professional and arrived on time. Took photos of the roof so my insurance company could see that the lichen was removed.” - Careful around gardens, plantings, and conservation-abutting land while working _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSURMZ0tiTXR3RRAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgIDLgKbMtwE%7C%7C?hl=en) — “5★ We were extremely pleased with Celtic Power washing. We have a lot of plantings, a garden, and we live alongside conservation land. Not o…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUR4OG9PY19nRRAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgIDx8oOc_gE%7C%7C?hl=en) — “5★ They did a great job gentle cleaning my house. Covered all my plants. Would highly recommend them. Thanks Jack” - Multiple repeat customers used the company again over several years _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTURJeklhb0NnEAE!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgMDIzIaoCg%7C%7C?hl=en) — “5★ Celtic Services has completed a number of jobs for me over the years. Jack and his team are professional, reliable and I've been very ple…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSURSbm9TRDdRRRAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CIHM0ogKEICAgIDRnoSD7QE%7C%7C?hl=en) — “5★ This is our second power washing with Celtic Services and I couldn't be more pleased with the outcome. Jack and Aiden were extremely thor…” - Specializes in Specialty Services _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT214bmNEVlBPR1ZCV1VSZldrdGFaeTFzWjBKTFgyYxAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CAIQACodChtycF9oOmxncDVPOGVBWURfWktaZy1sZ0JLX2c%7C%7C?hl=en) — “5★ They cleaned my gutters. Jack is very organized and completes the job when promised.” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2paRmJFMXFaRkEyVGtnME1WRTBNMU5zU1hsQmRXYxAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CAIQACodChtycF9oOjZFbE1qZFA2Tkg0MVE0M1NsSXlBdWc%7C%7C?hl=en) — “5★ My roof was covered with Cape Cod moss and stains.They did a fantastic job cleaning it. It looks brand new I highly recommend them.” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21WME5tRXRObGxoV0hjNFQzWklhM2w1TkRaTWRrRRAB!2m1!1s0x0:0xf2a06c22a1cf7668!3m1!1s2@1:CAIQACodChtycF9oOmV0NmEtNllhWHc4T3ZIa3l5NDZMdkE%7C%7C?hl=en) — “5★ Very pleased with Celtic Services! Highly recommend! Professional, friendly, and great customer service. We had house, deck, outdoor show…” ## License Status: **not_found** — verified against the official MA state registry, never self-reported. Re-check at the official registry: https://madpl.mylicense.com/Verification/ ## Sources - [Google](https://www.google.com/maps/search/?api=1&query=Celtic%20Services%2C%20Inc%20Powerwashing&query_place_id=ChIJh56LN24z-4kRaHbPoSJsoPI): 5.0★ from 83 ratings - [Google Reviews](https://www.google.com/maps/search/?api=1&query=Celtic%20Services%2C%20Inc%20Powerwashing&query_place_id=ChIJh56LN24z-4kRaHbPoSJsoPI): Listed on this source - [Official Website](https://celticpowerwashing.com): Self-reported profile and service details ## Recent reviews - **5/5 · Google Reviews · Mary Bradley · 2026-08-14**: The employees and this company are very thorough, respectful, and prompt. They show up when they say they will and leave the premises better than when they arrived. I have used Celtic services a few times and have been very pleased. - **5/5 · Google Reviews · Rick Lockwood · 2026-04-25**: Outstanding. - **5/5 · Google Reviews · dondipan · 2025-12-20**: They cleaned my gutters. Jack is very organized and completes the job when promised. - **5/5 · Google Reviews · Ellie Swain Ballard · 2025-12-04**: On 12/3 I was contacted by our insurance company saying moss needed to be removed from our house in Sandwich within 30 days. I contacted Celtic that evening and heard back from Jack within minutes. He was planning to shut down his operation for the winter but was willing to delay it a day and comple… - **5/5 · Google Reviews · Richard Travers · 2025-09-29**: Celtic Services is a very reliable and punctual company. They showed up as promised and worked very hard to get the job done. I will not hesitate to call them again when the need is there. I put full stock and trust in this wonderful company. - **5/5 · Google Reviews · Michael Schumaecker · 2025-09-04**: My roof was covered with Cape Cod moss and stains.They did a fantastic job cleaning it. It looks brand new I highly recommend them. - **5/5 · Google Reviews · Mary McKeon · 2025-09-04**: Jack was incredibly responsive in returning calls and providing quotes. The work done was professional, done when he said it would be done and reasonably priced. My roof and shingles look brand new. I would highly recommend his work/company! - **5/5 · Google Reviews · tina nelson · 2025-07-07**: Very pleased with Celtic Services! Highly recommend! Professional, friendly, and great customer service. We had house, deck, outdoor shower and outdoor furniture power washed. Looks like a new house!! Thanks Jack - **5/5 · Google Reviews · Alan Gray · 2025-07-07**: After almost ten years our back deck and patio were desperately in need of cleaning. Celtic Services came in and worked their magic and brought our backyard back to life. A job well done - **5/5 · Google Reviews · Lynn Nutter · 2025-06-28**: Very pleased with results of the roof cleaning. Would recommend their services. --- Data freshness: last scanned 2026-08-24T01:13:01.125Z. Cite as: Celtic Services, Inc Powerwashing — Tavlee (https://tavlee.com/contractor/celtic-services-inc-powerwashing-marstons-mills) Source: https://tavlee.com/contractor/celtic-services-inc-powerwashing-marstons-mills