Here is an overgrowth scenario where the underbrush and Maples had been growing wildly for many years and un-pruned.

Before and after photos of a good amount of trimming and removals.

Didn’t get any before pictures, but the hedge trimming turned out phenomenal after being overgrown for about 3 years.

It is very important to keep all vegetation at least 6 inches or so away from your structures to prevent molding and structure damage from the foliage growing into your siding or scratching it.

Trimming your tree limbs off and away from your roof will prolong the life of your shingles preventing moss. Also, not allowing critters to access your roof and vents to nest in.

Here Is a perfect example why topping Evergreen trees is never recommended. 
Once you cut the stock, multiple limbs grow straight up to recreate tops. 
This causes multiple tops. 
In time, they will start losing space for each other to share and breaking off causing damage to structures, hazards to humans / animals. By cutting them is creating an unhealthy top; basically causing a wound and exposing them, water saturation causes decay and rot, then breakage when the tops grow and get heavy.

This was a traditional giant Western Washington Cottonwood.
One of the most dangerous trees to have within any living space, around your home or anywhere that pets or loved ones frequent. 
Known for dropping huge limbs and toppling completely over from minimal amounts of wind.

This is definitely not a removal job for just any climber.
Nobody less than a seasoned, confident professional.
The total backyard Drop Zone in this particular removal, definitely was not much space to work with. 
This was only 25 ft by 60 ft.