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These are some helpful tips when narrowing down the company you want to install your wall.  Price should not be your only decision making item.  Things that are cheaper are cheaper for a reason.
Does the company guarantee their work for a full year?  This is a huge benefit.  Who is going to fund the correction of any problems without a guarantee?
Maple Leaf guarantees all of our work for one full year.  This is why we will only install walls to the industry code.  We do not skimp on materials to lower the price.
Is the company insured and licensed?   If something goes wrong or someone gets hurt who will cover the expenses involved?  If they are not insured, YOU as the homeowner could be held accountable.   If you need assistance with issues The NJ Division of Consumer Affairs will gladly help you lodge complaints, and resolve issues with licensed contractors.  You can surf their website to see if a contractor is licensed and have any complaints lodged against them.
Maple Leaf is fully insured and licensed NJHIC # 13VH03845600
Is the company certified to install segmental retaining walls and pavers?  Did they show the certificate?
Maple Leaf is certified by the National Concrete Masonry Association, and will gladly show you our certification, just ask!
Retaining wall base should have 8-10” of quarry processed stone, compacted in layers.  This is an easy item a contractor can skimp on to lower their price.  Is this item listed on the estimate sheet?
Maple Leaf will advise the estimated amount of tonnage required right on our estimate sheet.  You can search the web for stone calculators to verify the correct amount.  The base layer is critical of the wall’s longevity.
Retaining walls should have ¾” crushed drainage stone, compacted in layers up to 6” from the top of the wall.  Is this item listed on the estimate sheet?  This is key to the proper flow of water behind the wall.   If not enough drainage is installed the water may push on the wall, and over time the wall will begin to fail.
Maple Leaf will install the proper amount of drainage stone to ensure the success of your wall.  This item will be listed right on our estimate sheet.
Retaining walls should have drainage pipe the entire length of the wall. Daylight drain pipes should be placed every 50 feet.  Is this item listed on the estimate sheet?  This is another key item for proper water drainage.
Maple Leaf will install drainage pipe behind the entire wall.  If the wall requires it; daylights will be properly placed.  This item will be listed right on our estimate sheet.
Retaining walls should have 1.5 – 2 block layers underground.
This is a key item to the stability of the wall.   A contractor could easily leave out this step to lower their price. 
Maple Leaf does not skimp on product to lower the price.  All walls installed will have the correct quantity of layer(s) underground.
Most municipalities require permits, and an engineer’s drawing for any wall over 4 feet high.   An engineer’s drawing can cost $750+, and if they require a design of the property that can cost $300+.   If a contractor claims this is not necessary, this is a RED flag to watch out for.   You can call your town hall and verify this.   This is how a contractor will lower their price, and in the end will only come back to you to deal with.  Please be aware that YOU  will be held accountable for paying the permit & all other costs if a town official discovers a 4 foot wall installed on your property without proper authorization and requirements.

Maple Leaf will ensure that all required  permits, etc.. are obtained and all inspections passed.   Engineer’s ensure the proper material and requirements are met for your specific wall.  The town inspector will ensure all the requirements are met.  This is a safety benefit for you to ensure proper installation of a larger wall