June 2020 coronavirus update: I love this place, but staff at checkout are dismissive of safety…read moreconcerns and frequently not wearing a mask.

Real lumber yard in west Philly. Carries a good supply of sustainable building products that I use…read morefor my construction company.

Great customer service laid out my kitchen cabinets and counter tops ask for joe or joseread more

This place is your one stop shop for all of your home improvement needs. Everyone is so helpful…read moreand knowledgeable. Highly recommend

I cannot think of another business that so badly does not want my business. I spent 2 hours in the…read morestore putting together a semi- custom vanity and a whole bathroom's hardware. I am still waiting a couple days later for the build/price sheets. I have called twice. Similar to another reviewer, the owner blocked my car in. I was told that "maybe the parking space lines aren't clear". A customer treated disrespectfully. My money is going elsewhere.

Staff is friendly and knowledgeable, and compared to box stores and suppliers, prices are very…read morereasonable. Quality is better than average box store or Ikea. If you know or care about the difference between an MDF cabinet box with laminate doors and a plywood one with solid maple doors, you will appreciate this place. They have everything you need to finish a home on the interior and exterior. Doors, windows, siding, flooring, cabinets, tubs, on and on. There are some deals, some not. Know your prices headed in. Inventory varies and if their website has it, it may be for order, or only available when they randomly get stock. They are conscientious about what they have or don't if you call ahead, but were a little impatient with a longer list. Their website says "We pride ourselves on providing excellent sales and delivery services to the Cecil County, Harford County, northern Baltimore County, New Castle County, Delaware and Chester County, Pennsylvania areas," but they do not go as far as the PA counties mentioned, at least not for homeowner orders. So be local or be prepare to haul stuff home. Made a trip today but they didn't have what I needed in a price competitive with another liquidator, though they definitely had great deals compared to Depot, Lowe's and my supplier. Had I not known of my other source, I definitely would've still saved 40% on fiberglass entry doors, and about 15% on fiberglass patio doors. They also offer a much better selection than a home improvement box store.

This place is amazing! There are so many choices in supplies to choose from and the staff is very…read moreknowledgeable on everything. We met with Phil to discuss our kitchen remodel design and he went thru the plans in detail, showing us each and every cabinet, drawer and accessory that was incorporated into our design . He asked questions and answered questions quickly and professionally. We are very happy to be working with him on our remodel.

Great place to go to for pavers, flagstone, gravel, concrete, anything you can think of. Prices are…read morefair, and the guys helping you out are really friendly. Mike is my go-to: he's super friendly and helpful, and I can't say enough words of praise for him.

Had a great experience buying decorative stones here. Excellent quality and very fair prices. On…read moretop of that the workers in the yard were super helpful.

This place is not for the casual consumer but rather people who know the material they want. Yes…read moretheir communication is bad but for professionals this is where 70 percent of the city goes because they have the best prices. The store is also dirty but if you don't care and only want the best prices this is the place to go

Terrible service and no communication skills at all. I would give them a negative 5 stars…read more Everybody from top to bottom is ignorant and some look like they are on drugs not to mention the prices are absolutely ridiculous do yourself a favor and never go there.

Best service and professionalism, their prices are very competitive and provides best products and…read moresolutions as well.

Was very happy with everything I bought cabinets , countertop , backsplash customer service was…read moregreat

I've been doing business with Diamond M Lumber since about 1980 as a homeowner, not as a…read morecontractor. I have always found them to be responsive to my needs. Their ginormous yard and store have about anything you could possibly want, consistent with an old fashioned country lumber yard. You can help yourself inside the store or they will provide assistance in finding what you need on the huge sales floor. The place is cluttered but they have about anything you possibly need from outsized lumber to real oak trimming, to multiple sizes and grades of plywood and treated plywood. They have many obscure items that a big box store wouldn't carry. Also, they offer bulk purchases of all manner of nails, screws and washers, right out of the boxes, as in days of old. If you are purchasing anything more than a few pieces or quantities of something, the owner will give you an adjusted price in many cases. A contractor I hired for a home addition relied on Diamond M for building supplies, especially since he needed some very outsized micro-lam beams to carry out my architectural plans. The downside of the business is that they are lacking an inventory control system and they use penciled pricing books to cost out an order, due to the lack of any computers at the counter. One employee told me jokingly that if he finds that something is out of stock, they tell the management and they will order a truckload of it! When I was in my prime, and doing a lot of work on my home and property, they came to know me. Whenever I walked in they would acknowledge me. Only once was the owner a bit snippy with me when I asked him a question while he was behind the counter but I didn't realize he was in the middle of some pricing estimates. So if you need something common and simple in small quantities, or if you need a huge barn beam and monster sized bolts to secure it, they will probably have it, or get it for you.

Diamond M Lumber is Horrible they provided no assistance when purchasing and will not accept…read morereturns, very rude owner, stay away from this place.