Trim suppliers, like this one that I deal with. Not the big boxes. If their standard profiles and sizes don't suit you, they can mill exactly what you want.

There's your answer.

That looks like a common 1x8 with a base cap on top. Any lumber yard can set you up with that.

Traditional baseboards are made up of multiple elements, a flat board can give you most of whatever height you want, then add mouldings on top and a shoe moulding to finish the top and bottom edges. It can be as tall, thick, or elaborate as you like.

A real lumberyard will have either a taller premade baseboard or a variety of ideas and components to combine to make your own baseboards.

And you wouldn't even want a one-piece tall baseboard. There's beauty in doing it in separate pieces--it's customized for your space and eliminates some of the problems of fitting a large heavy molding to uneven walls and floors. The smaller pieces are more flexible.

And a cost

Tall and/or tall with multiple pieces will be rare except in more expensive homes.

7" tall single piece base boards do cost more to install vs 5", the use of a compound and/or sliding miter saw and more time.

Building a 7" tall base from 7 separate pieces will increase the labor costs dramatically. A great look though. Either way, labor is usually the largest cost consideration when its paint grade.

I have project with a "flush" base with "F" reveal where labor will drive the cost.

The initial OP photo at the top is a similar profile to one I saw in the "working offices" in the Palace of

Versailles, about 5" tall but carved from black marble of course. The king had a construction crew of 20,000 working 5 years.

Baseboards, and all trim, should be proportional with the home’s size and style. A 7” detailed Baseboard says that this is a pretty traditional home, with 12’ ceilings. If that isn’t your home?

I live in a very traditional Colonial Revival built in the 1920s, before the advent of mass production tract houses. It was custom built for the president of the Singer Sewing Machine company, and so considered high end for the time. It has 8-ft ceilings, and all the base trim is original. It's in 3 parts, a 7" flat panel, an ogee cap and an ogee shoe molding. All told it is 8" high and looks perfectly proportional. Any time we've done any renovations we've replicated the molding for consistency and aesthics, which I think is important when owning a fairly old home.

As said above, just call up a local lumberyard - they'll have it all (or can get it). Forget the big box stores.

Thank everyone. Yes... have been working with a lumberyard. They’ve been talking about multi piece just haven’t priced for me yet. I’m wanting to do all wood and not mdf so I’m worried it will be much higher cost. The ceilings are 10, 12, and vaulted 17 on the first floor and 9 upstairs so proportionally I think it needs something taller... especially downstairs.

My baseboards are 9 or 10”, one piece. Not home or I would measure for you. Poplar..primed. Made by the same Amish craftsman that did my cabinetry and builtins. They also did all of my other trim.

look around your area for Amish craftsmen.

ILoveRed, I love your casing! I have been trying to replicate that look in my own home. Do you mind sharing more photos and measurements?

Beautiful trim, ILoveRed. The door casing is a simple flat piece with a backband. I have that on all my windows and doors.

Mcquirks...Diana is right. My trim is a simple flat board with a 1” backband. The flat board is either 3” or 4” depending on how large the opening is. I’m not home but I will get more pics when I get home if you can’t find them.

this was my Houzz inspiration picture. Mine is obviously not this large but I love this trim In this pic.

one word of warning. if you do this ...mine is mitered and is effected by humidity a little more than I thought it would be even though we are very careful With humidity. I wonder if this butt would have been better.

Kuiken Brothers Moulding - Crown, Casing, Base, Panel · More Info

Hmmm, maybe check around a bit. We have a local mill that is happy to do wider widths and it's not ridiculously expensive to do. And that's for just a wider baseboard with a fairly simple fall. What you've pictured shouldn't be all that expensive, because the actual knife to cut the fall doesn't have to extend the full width of the board - just the top couple of inches.

Sometimes a small shop with a go-getter at the helm will be a better source.

It's not hard to find. As stated, REAL lumberyards can get it. Fortunately, I have a trim millworks factory less than an hour from me that sells directly to the public and their service is phenomenal. Whatever you want, they can make it. Getting ready to use them for our third house :)

Depending on where you are, they have 15 showrooms in the Southeast.