I built a starter home with Landmark last year. So I will give an honest opinion for my own experience.
I found the time frame for the actual house being built more than reasonable. Papers were signed in December and foundation was started in March with the move in date to be August. The one downside is you can't customize the floor plan, but that was Ok as I was happy with my layout.
There wasn't any major issues, most were cosmetic, the one complaint was the painting done in some areas by the trade. Which brings me to the main thing with any builder, their warranty department. Now I can't say I had some of the issues dealing with them like the other reviewers, but I can say Cara was always good to deal with. I had an issue with my HVAC and it was fixed in a few weeks. Other minor issues were dealt with within a month or so. Kevin should also get a mention for going thru my final walk through and fixed some things on the spot, like my garage and one interior door that didn't close properly.
The only negatives was the paint job on some of the walls (after a year I'm still catching some spots poorly done...sorry, but a 10 year old could do a better job), and the garbage left all over my garage driveway and in my garage by the trades people. In fact I found a roll of nails in my driveway, luckily didn't run over it and damage my tire. So that's one thing Landmark needs to do, is better managing of their trades people.
Overall, the quality of some of the workmanship is average. I found some things where a little more care could have been taken care of.
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UPDATE Sept 12, 2014 (I have dropped my rating from a 9 to a 4)
Update Sept 12, 2014
I felt it was time to give an update with my experience.
The home and the after work follow up, has been excellant.
However, it has been the Landmark builders/contractors working around my home that has been a headache.
Some of the issues:
1. Excavating the lot beside me, they dug right up to my house and caused the rocks in my window well to pour out from the bottom (this has yet to be fixed)
2. Both sides of my back driveway sod have been run over on separate days and destroyed, even though I have 2 big empty lots beside me. Enough for anyone to maneuver around. As well their contractors have been driving on my garage driveway. How do I know this? I power washed it prior to the rain/snow we've had and have not parked back there since, but found all their muddy tire marks all over it. My concern is it getting damaged from the heavy trucks/machinery.
3. My front sod was destroyed when the developer ripped out the sidewalk concrete. Yes, even though this is the developer and not Landmark doing the job, I feel they are both partners and this was poor planning on both their parts. This should have been done BEFORE the sod was put in.
4. Constantly picking up garbage from the work sites blowing over onto my property
So far I've been promised they can only repair the driveway sod once. So of course I have to wait until next year, otherwise their contractors will run over it again.
Seems every day I come home from work there is some kind of issue. When all it would take is for their workers to show some care and not disregard to the other properties they are working around.
Now trying to get a hold of someone and getting the info of the site super is almost impossible. Their workers and sub-contractors have NO respect for any of the completed homes, as they work in the area. I'm not the only one on my block having problems.
My advice at this point, is if you're going to build with them, check to see if there are other undeveloped lots around you. Otherwise you may face the same headaches I've had dealing with them. Or you can just sit outside every day while they're working and watch them (ya right). Also get your own lawyer and do not used theirs, I'm glad I did. Also have your lawyer have a hold back of funds for the landscaping and grading. Right now that is all I have if they do not repair the damage their people have done.
If you asked me a year ago if I would build with them again or recommend them I would have said yes. Ask me now, and I would say no. What's important is customer service and hiring workers that respect private properties.