Quality Inspection Services for different kinds of doors:

Door types:
PVC mdf wood door,PVC Glass Door,PE wood door,Panel wood door,Melamine wood door,Veneer wood door,Swing door,Solid wood door,Solid wood glass door,Painting wood door,Sliding door,Glass door,Iron door,Bronze Brass Door,Steel fireproof door,Steel-Wood Interior Door,Steel Security Door,Steel-wooden armored door, PVC toilet door,Exterior door, Interior wood door, Aluminum Bathroom Door,Double door,Security door

Door Accessories:
Door skin
Melamine door skin
Stainless steel door hinge
Interior Door Lock

Some comment factors to check:

Material
Specification : Structural dimensions of the door
                       The thickness of the door leaf
Style
Adhesive
Paint
Glass
Decorative materials
Sealing materials
Door Cut out specification/fitness
Hardware, accessories, fasteners
Left seam limit
Decorative surface veneer surface appearance requirements
Paint decorated surface appearance requirements

more information at http://www.china-qualityinspection.com/wood-Doors-metal-Yongkang-Foshan-shenyang-jiangshan.html