Beginner
≈ 9 h 30 minSuggested range6 h – 14 h
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Technic · SET 42099
4X4 X-treme Off-Roader
A large-wheeled off-roader integrates motors and suspension. CONTROL+ operation adds digital functions to check on your device.
- Pieces
- 958
- Release year
- 2019
- Theme
- Technic
- Set number
- 42099
- LEGO recommended age
- 11+
- LEGO retail price · Italy
- 229.99 €
Retired from the LEGO Italy catalogue when checked on 23 October 2026. Availability can change. Check the store for the latest information.
Retail price reported by the LEGO source for the stated market. Check the store for current price and availability; this does not establish the launch price. LEGO ↗ · Reference checked on 23 October 2026
Official English name verified at: LEGO English catalogue ↗ · Checked on 24 October 2026.
TIME TO BUILD
How long does it take to build 4X4 X-treme Off-Roader?
A starting point for planning your build. Times for each experience level are editorial estimates, not measurements submitted by HowLongToBuild users.
Editorial model estimate · no verified measured building time
Intermediate
≈ 6 h 30 minSuggested range4 h – 9 h 30 minExperienced
≈ 4 hSuggested range2 h 30 min – 6 hBased on one person building the set for the first time, following the original instructions and using numbered bags where supplied. Includes normal piece-finding and minor adjustments; excludes long breaks, filming, dismantling and modifications. Sources may use different methods. This range is neither a statistical interval nor a limit: your build may take less or more time.
How we estimate times · sources and method
Motors, wiring and suspension need organised assembly and tests before bodywork. The three central durations are model-specific editorial assessments. Planning ranges extend approximately from 65% to 145%, rounded to quarter-hours; they are not measured experience-level averages or guaranteed limits.
Sources do not always specify the builder’s experience. The three experience bands are our editorial assessment, based on the complexity of the set and individual accounts where available.
- LEGO Italy · 4X4 X-treme Off-Roader ↗
This source documents the model’s features and components, not a timed build. No sufficiently verifiable individual building-time report has been identified for this set.
- LEGO building instructions · 4X4 X-treme Off-Roader ↗
Set-specific instructions checked against the set number, piece count and year. The duration is an editorial assessment based on piece count, construction type, mechanisms and detail.
Checked: 23 ottobre 2026 · Method v1.0 · Limited reports; not a statistical average.
BUILT BY THE COMMUNITY
Yours could be the first building time.
0 reviewed solo building times.
No solo building times have been reviewed yet. You can still find editorial estimates under Suggested times.
Log your buildBuild your own story.
Save this set to your collection, track your progress and share your building time.
Create a free account →BEYOND THE BRICKS
Did you know?
Inside the set
Three motors
Two XL motors, an L motor and a Smart Hub are included.
LEGO sourceIndependent suspension
Large wheels and chassis travel tackle obstacles.
LEGO sourceBeyond the set
The stories, places and inventions behind your build.
Ninety before Defender
The coil-sprung Ninety arrived in 1984. The Defender name followed in 1990.
Land RoverAn approximate number
The Ninety’s wheelbase was actually closer to 93 inches; its name rounded the measurement.
Land RoverWritten by HowLongToBuild · Sources are linked with each story · Checked on 23 October 2026. Historical facts and story details refer to the context described.
THE COMMUNITY’S EXPERIENCE
What was it like to build?
Three separate scores from 1 to 10. For difficulty, 1 means very easy and 10 means very difficult.
No approved ratings yet. Scores are never generated by this site or inferred from the recommended age.
Sign in or create an account to rate this set →Building tips from the community
Specific steps, useful checks and sticking points. Contributions appear after moderation, in their original language. Do not upload instruction pages or personal contact details.
No approved tips yet.
Sign in to contributeSET THE MOOD
A soundtrack for your build
· Selected for the subject and atmosphere
For intricate structures and extended sessions we choose a quieter ambient texture. It leaves space for the instructions, while the electronic alternative adds energy when you want it.
OUR PICK
Ambient 1: Music for Airports
Brian Eno
Ambient · minimal and relaxedA build to spread over several sessions: choose the more understated option when you want the instructions to take centre stage. The music does not set your pace.
Editorial suggestions, not official soundtracks for the set. External services may require an account or subscription; editions and availability can vary by country. Suggest another soundtrack →
Report a problem with this set →
YOUR NEXT BUILD
You might also like
Sets from the same theme or with similar suggested building times. The ranges shown are for intermediate builders.
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Volvo EW160E
1,166 pieces · 10+
3 h 45 min – 10 h 30 min
Suggested time · Intermediate
Same theme, a new build
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Air Race Jet
1,151 pieces · 10+
3 h 45 min – 10 h 30 min
Suggested time · Intermediate
Same theme, a new build
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Volvo Concept Wheel Loader ZEUX
1,167 pieces · 10+
3 h 45 min – 10 h 30 min
Suggested time · Intermediate
Same theme, a new build