Short answer: the Audi A3 5-door hatchback (2012) is bigger — it is 2.5 cm1 in25 mm longer and 2 cm0.8 in20 mm wider than the Audi A3 5-door hatchback (2003).

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Audi A3 vs Audi A3

Audi A3 (2012) Third generation · 2012 · 5-door hatchbackAudi A3 (2003) Second generation · 2003 · 5-door hatchbackaligned at front bumper + ground · same scale
Audi A3 (2012) · 431 cm14 ft 2 in4,310 mmAudi A3 (2003) · 428.5 cm14 ft 1 in4,285 mm Audi A3 (2012) · 142.1 cm4 ft 8 in1,421 mmAudi A3 (2003) · 142 cm4 ft 8 in1,420 mm
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Audi A3 Third generation2012–2020 · 5-door hatchback
Length431 cm14 ft 2 in4,310 mm2.5 cm1 in25 mm longer
Width178.5 cm5 ft 10 in1,785 mm2 cm0.8 in20 mm wider
Width incl. mirrors—no data
Height142.1 cm4 ft 8 in1,421 mm0.1 cm0.0 in1 mm taller
Wheelbase263.6 cm8 ft 8 in2,636 mm5.8 cm2 in58 mm longer wheelbase
Ground clearance—no data
Boot (seats up)—no data
Boot (seats folded)—no data
Weight1,150–1,520 kg 
Audi A3 Second generation2003–2013 · 5-door hatchback
Length428.5 cm14 ft 1 in4,285 mm2.5 cm1 in25 mm shorter
Width176.5 cm5 ft 9 in1,765 mm2 cm0.8 in20 mm narrower
Width incl. mirrors—no data
Height142 cm4 ft 8 in1,420 mm0.1 cm0.0 in1 mm lower
Wheelbase257.8 cm8 ft 5 in2,578 mm5.8 cm2 in58 mm shorter wheelbase
Ground clearance—no data
Boot (seats up)—no data
Boot (seats folded)—no data
Weight—no data

Dimensions may vary by trim, market and model year. For guidance only — check with the manufacturer before you buy. Sources are listed on each car's page.

Audi A3 5-door hatchback (2012) vs Audi A3 5-door hatchback (2003): the differences

Will they fit? UK parking bay and garage

CarParking bay 4.8 × 2.4 mSingle garage, 7 ft door
Audi A3 5-door hatchback (2012)Fits comfortablyFits, but tightcheck my garage
Audi A3 5-door hatchback (2003)Fits comfortablyFits, but tightcheck my garage

Assumes a UK standard parking bay of 4.8 × 2.4 m and a typical UK single garage of 4.8 × 2.4 m inside (2.1 m high) with a 7 ft × 6 ft 6 in (213 × 198 cm) up-and-over door. Where we have no width-with-mirrors figure we add 20 cm to the body width. “Comfortably” leaves about 60 cm to walk round and open a door; “tight” means it goes in but getting out is awkward. Garages and bays vary a lot — measure yours and use the garage fit checker. For guidance only.

See the full specifications and sources: Audi A3 5-door hatchback (2012) · Audi A3 5-door hatchback (2003). Dimensions may vary by trim, market and model year.

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