Short answer: the Audi A3 5-door hatchback (2020) is bigger — it is 7 cm3 in70 mm longer, 2.7 cm1 in27 mm wider and 5.4 cm2 in54 mm lower than the Volkswagen Golf Mk8 (2019).

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Volkswagen Golf Mk8 vs Audi A3

Volkswagen Golf Mk8 2019 · 5-door hatchbackAudi A3 Fourth generation · 2020 · 5-door hatchbackaligned at front bumper + ground · same scale

Side Front Rear

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Volkswagen Golf Mk82019–present · 5-door hatchback

Length428.2 cm14 ft 1 in4,282 mm7 cm3 in70 mm shorter

Width178.9 cm5 ft 10 in1,789 mm2.7 cm1 in27 mm narrower

Width incl. mirrors—no data

Height148.3 cm4 ft 10 in1,483 mm5.4 cm2 in54 mm taller

Wheelbase262 cm8 ft 7 in2,620 mm0.4 cm0.2 in4 mm shorter wheelbase

Ground clearance—no data

Boot (seats up)381 L1 L more boot space

Boot (seats folded)—no data

Weight1,255 kg61 kg lightervaries by version

Audi A3 Fourth generation2020–present · 5-door hatchback

Length435.2 cm14 ft 3 in4,352 mm7 cm3 in70 mm longer

Width181.6 cm5 ft 11 in1,816 mm2.7 cm1 in27 mm wider

Width incl. mirrors—no data

Height142.9 cm4 ft 8 in1,429 mm5.4 cm2 in54 mm lower

Wheelbase262.4 cm8 ft 7 in2,624 mm0.4 cm0.2 in4 mm longer wheelbase

Ground clearance—no data

Boot (seats up)380 L1 L less boot space

Boot (seats folded)1,200 L

Weight1,316 kg61 kg heaviervaries by version

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.

Volkswagen Golf Mk8 (2019) vs Audi A3 5-door hatchback (2020): the differences

The Volkswagen Golf Mk8 (2019) is 7 cm3 in70 mm shorter, 2.7 cm1 in27 mm narrower and 5.4 cm2 in54 mm taller than the Audi A3 5-door hatchback (2020).
Its wheelbase is 262 cm8 ft 7 in2,620 mm against 262.4 cm8 ft 7 in2,624 mm (the same).
Boot space with the seats up is 381 litres in the Volkswagen Golf Mk8 (2019) and 380 litres in the Audi A3 5-door hatchback (2020) (1 litres more).
The Volkswagen Golf Mk8 (2019) weighs 1,255 kg and the Audi A3 5-door hatchback (2020) 1,316 kg — about 61 kg lighter.

Will they fit? UK parking bay and garage

Car	Parking bay 4.8 × 2.4 m	Single garage, 7 ft door
Volkswagen Golf Mk8 (2019)	Fits comfortably	Fits comfortably	check my garage
Audi A3 5-door hatchback (2020)	Fits, but tight	Fits comfortably	check 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. Garage: “comfortable” means at least 40 cm spare in length and 35 cm in width with mirrors, driving in with mirrors out; “tight” means at least 20 cm spare in length and 40 cm in body width, mirrors folded. Bay: “comfortable” leaves 30 cm in length and 20 cm each side. Garages and bays vary a lot — measure yours and use the garage fit checker, or see UK garage and parking space sizes. For guidance only.

See the full specifications and sources: Volkswagen Golf Mk8 (2019) · Audi A3 5-door hatchback (2020). Dimensions may vary by trim, market and model year.