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18th Birthday Decorations

18th Birthday Decorations shows low returns (0.6%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Flapen Score

63
Worth a look
Market size 60Growth 21Conversion 76Competition 87Returns 97Price range 0Avg price 20Brand share 96Review moat 71Quality gap 63
This niche Category average

Is 18th Birthday Decorations profitable on Amazon?

According to Flapen's Amazon United Kingdom niche tracking, 18th Birthday Decorations is a £512K/yr Amazon United Kingdom market (967K searches/yr). The top 5 brands hold 35% of demand. Demand peaks in Jan. Verdict: Worth a look — 63/100.

18th Birthday Decorations: the Amazon niche in one read

Everything a seller checks before entering, in three answers.

Is the demand real?

Worth a look. Search demand moved -8.3% over the last 90 days and 7.2% of searches end in a purchase.

£512K

revenue / yr

Units sold / yr80K
Search volume / yr-8.3%967K
Conversion rate7.2%
Avg price£7.36

Who owns the niche?

The top 5 brands hold 35% of demand, so 65% of the market is open.

65%

open market share

Brands · sellers50 · 84
Top-5 product click share28%
Open market65%
Avg brand age23 months

Is there a way in?

Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.4★ — the gap to enter on.

0/100

page quality · 71 products

Sponsored placement90%
New entrants (1y)12· 0 succeeded
Avg rating4.4★
Avg reviews655

Top 18th Birthday Decorations products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Competition: brands, sellers & click share

Clicks spread well past the top 5 (28% combined) — an open shelf where new products get seen.

£0£15K£31K£46K£61K101001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

50 falling

Sellers

84

Top-5 brand share

35%

Top 20: 75%

Top-5 click share

28%

Top 20: 62%

Open market

61%

  • VICTERR12%
  • balloon garland7%
  • DEARLIVES6%
  • Grevosea5%
  • ANOMM5%
  • weeyin5%

18th Birthday Decorations demand & seasonality

Weekly search volume, with the niche's key stats alongside.

Volume967KCVR7.2%Products71Brands50Top 5 Brands35%OOS Rate5.3%Rating4.4★Reviews655Avg BSR#230
25K15KSpike '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Jan · busiest ÷ quietest = 1.9×

Top 18th Birthday Decorations search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

  • 18th birthday decorations559K/yr
  • 18th birthday banner106K/yr
  • 18th birthday decorations for boys47K/yr
  • 18th birthday balloons45K/yr
  • 18th birthday decorations for girls40K/yr
  • 18 birthday decorations24K/yr
  • 18th birthday banners22K/yr
  • happy 18th birthday banners17K/yr
  • 18th balloons13K/yr
  • 18th birthday decorations boy11K/yr

What reviews say buyers love and hate about 18th Birthday Decorations

What buyers mention most, as a share of all reviews.

What buyers love

86% of reviews
Quality-Overall38%

Good variety

Value For Money23%

Excellent value

Advertised Vs Actual Product6%

As described

Color4%

Beautiful colour

Gifting Purpose3%

It was the perfect amount for my 18 gifts too

What buyers complain about

88% of reviews
Inflation/Deflation25%

both balloons deflated

Quality-Overall22%

so I'm disappointed that they seem to have deteriorated in quality since

Advertised Vs Actual Product9%

Deceptive description

Strength8%

Needs to be stronger

Value For Money7%

Not good value

18th Birthday Decorations return rate & reasons

Why buyers send it back, as a share of all return requests.

0.6%

Return rate

53%

Fixable by listing

The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.

1Color
21%
2Size-Overall
16%
3Quality-Overall
15%
4Inflation/Deflation
9%
5Advertised Vs Actual Product
7%

Common 18th Birthday Decorations questions

The questions sellers ask about this niche, answered from the tracked metrics.

Flapen scores 18th Birthday Decorations 63/100 on Amazon United Kingdom — Worth a look. The niche generates £512K/yr across 71 tracked products. 0 of 12 products launched in the last 360 days are still selling. Search demand moved -8.3% over the last 90 days.
Search demand for 18th Birthday Decorations on Amazon United Kingdom peaks in Jan, where the busiest month runs 1.9× the quietest.