door shims
Skip itSoft demand (-17.6% this quarter) — this niche doesn't clear our bar today.
Conversion
Great11.0%search→purchase rate — share of searches ending in a sale
Returns
Great1.3%return rate — above 5% kills the launch gate
Review moat
Good1,256.54avg incumbent reviews — the moat a new listing must climb
Price range
Okay$5.67–$21.99cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Okay$200K$200K/yr · 171K searches
Avg price
Okay$10.65avg listing price — sweet spot $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Bad92%top-5 brand share — brand-locked demand
Competition
Bad78%top-5 click share — a locked-up shelf
Growth
Bad-17.6%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, door shims is a $200K/yr Amazon United States market (171K searches/yr). The top 5 brands hold 92% of demand. Demand peaks in Feb. Verdict: Skip it — 41/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
door shims market data
- Units sold / yr
- 20K–25K
- avg 1,500–2,000/product
- Revenue / yr
- $213K–$266K
- units × avg price
- Conversion rate
- 11.0%
- Avg BSR
- #364
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 92%
- Out of stock
- 0.0%
- Avg brand age
- 30 months
- Avg seller age
- 174 days
Competition & brand share
The top 5 products capture 78% of clicks — a locked-up shelf that new listings rarely crack.Brands
8 rising
Sellers
59
Top-5 brand share
92%
Top 20: 100%
Top-5 click share
78%
Top 20: 100%
Open market
5%
- E-Z Shim44%
- LHXZJHYX26%
- Nelson Wood Shims11%
- QUFA7%
- LikeLion4%
- AOGROD3%
- Open — no brand owns it (2 brands, 5%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -17.6% search growth over the last 90 days.Peak months: Feb · busiest ÷ quietest = 1.7×
Top door shims search terms
- door hinge shims59K/yr
- door shims34K/yr
- hinge shims21K/yr
- door shim10K/yr
- door hinge shim9K/yr
- hinge spacers7K/yr
- hinge shim6K/yr
- door shims hinge7K/yr
- door hinge shims 4 inch6K/yr
- door hinge spacer5K/yr
Top door shims products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
E-Z Shim EZ HS350BP 3.5 Hinge Shim 18 count Pack of 1 White
E-Z Shim$5.674.6★4,175 rev
12pcs Door Hinge Shims 3.5 inch Black Hinge Spacers Hinge shims 3.5 inch
LHXZJHYX$6.984.0★55 rev
EZ-Shim HS400BP 4 Hinge Shim (15 Pack)
E-Z Shim$5.874.6★2,387 rev
Door Hinge Shims Filling Gaps in Interior Doors Adjusting The Spacing to Align Them Used to Solve Problems Such As Door Air Leakage Can Be Trimmed 3.5 Inch (10 3.5 Inch Hinge Shims)
QUFA$7.364.4★106 rev
Nelson Wood Shims 8 24 Pack - Kiln Dried Wood
Nelson Wood Shims$7.824.8★2,315 rev
Newest
by launch date
AOGROD 15 Pack Door Hinge Shims 4 Inch Door Hinge Spacer Kit Precut Polycarbonate (PC) Black Hinge Shims with DIY Trimmable for Door Alignment & Repair Filling Gaps 1.2mm / 0.05 Thickness
AOGROD$14.253 rev
12pcs Door Hinge Shims 3.5 inch Black Hinge Spacers Hinge shims 3.5 inch
LHXZJHYX$6.9855 rev
12pcs Door Hinge Shims 4 inch Black Hinge Spacers Hinge shims 4 inch
LHXZJHYX$9.9755 rev
14 Pack Door Hinge Shims 4 Inch Door Hinge Spacer Kit Precut Polycarbonate (PC) Hinge Shims with DIY Trimmable for Door Alignment & Repair Filling Gaps Staggered Pattern 1.2mm / 0.05Thickness
HOHNNYREET$14.8528 rev
Door Hinge Shims Filling Gaps in Interior Doors Adjusting The Spacing to Align Them Used to Solve Problems Such As Door Air Leakage Can Be Trimmed 3.5 Inch (10 3.5 Inch Hinge Shims)
QUFA$7.36106 rev
Trending
90-day click momentumAOGROD 15 Pack Door Hinge Shims 4 Inch Door Hinge Spacer Kit Precut Polycarbonate (PC) Black Hinge Shims with DIY Trimmable for Door Alignment & Repair Filling Gaps 1.2mm / 0.05 Thickness
AOGROD$14.255.0★
12pcs Door Hinge Shims 3.5 inch Black Hinge Spacers Hinge shims 3.5 inch
LHXZJHYX$6.984.0★
14 Pack Door Hinge Shims 4 Inch Door Hinge Spacer Kit Precut Polycarbonate (PC) Hinge Shims with DIY Trimmable for Door Alignment & Repair Filling Gaps Staggered Pattern 1.2mm / 0.05Thickness
HOHNNYREET$14.854.9★
12pcs Door Hinge Shims 4 inch Black Hinge Spacers Hinge shims 4 inch
LHXZJHYX$9.974.0★
Nelson Wood Shims - 8-Inch Wood Shims for Leveling Pro Pack 120 Count Wedges for Toilets Tables Doors & Furniture Levelers for Uneven Floors
Nelson Wood Shims$21.994.6★
What buyers say about door shims
What buyers praise and complain about, mined from review topics.What buyers love
“Works as advertised”
“Easy use”
“were much better quality than some of the cheaper bundles Ive bought before”
“Worked for me”
“Exact fit”
“Money saver”
“The thickness is consistent across the pieces”
“Very easy to install”
“Door shuts easy now”
“Solid shims”
What buyers complain about
“To big”
“Terrible quality control”
“A little thinner that I was expecting”
“not for installing pre-hung doors”
“Didn't work for me”
“The door was sagging a bit which caused issues with sealing and latching”
“Cheap fix”
“They are plastic”
“Overpriced,”
“Pattern on the product I received was different than what was pictures”
Top return reasons
Common questions
- Is door shims profitable to sell on Amazon United States?
- The niche generates $200K/yr across 13 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is -17.6%. Flapen's verdict: Skip it (41/100).
- How competitive is the door shims niche?
- 8 brands and 59 sellers compete. The top 5 products take 78% of clicks and top 5 brands hold 92% of demand.
- What do buyers complain about in door shims?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Thickness. The return rate is 1.3%.
- When does demand for door shims peak?
- Demand peaks in Feb; the busiest month runs 1.7× the quietest.
- What does it cost to enter the door shims niche?
- Listings span $5.67–$21.99; the average listing price is $10.65 (sweet spot $15–$100). The average incumbent carries 1,257 reviews — the moat a new listing must climb.