Do I need professional assembly for my warranty?

Many brands prefer or require a professional build for warranty validation. We provide proof of professional assembly for your records.

What do you need from me on the day?

The boxed bike, any small parts/accessories that are included, a flat working space and access to the bike’s charger (for e-bikes).

How long does a boxed build take?

Typically 45–90 minutes, depending on the model, and any extras fitted (complex builds take longer).

Do you assemble e-bikes?

Yes. We also carry out visual safety checks and perform firmware/software updates where supported systems allow.

Can you assemble kids’ bikes before Christmas?

Yes. December slots go fast. We encourage you to book early to guarantee your appointment.

What if parts are missing or the box is damaged?

We’ll assess, photograph if needed and advise on the best fix. We can source parts, if required.

Do you offer a post-build check (e.g., 6 weeks)?

Yes, we do. Our 6-week check is available as an add-on to keep shifting and braking dialled after the first rides. Explore more services by visiting our services page.

Professional Bike Build in London, Surrey and the South East

Domex Bikes brings a certified mechanic to your door to build your bike properly. No need to pack, ship and send. We also tune it and make sure it rides right from day one. Our experts handle boxed bikes, e-bikes and kids’ bikes and we can fit common accessories on the spot.

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Our Bike Build and Assembly Options

What’s the difference between bike build and bike assembly? Our bike build service in London covers both new-in-box assembly and frame-up pro builds from separate parts. Bike assembly involves putting together a bike that’s mostly pre-assembled or in parts from a manufacturer. Choose what fits your bike.

Boxed Bike Build (New-in-Box)

You’ve just bought a new-in-box bike and need reliable and professional boxed bike assembly? We’ll help with everything from A to Z. For starters, we’ll unbox and inspect for any potential transit damage. Next, we’ll carry out your bike assembly in London and put everything together according to the manufacturer’s specifications. Other aspects we can help with include assuring of torque-checked bolts and fixings, gear/brake setup, wheel truing, setting tyre pressures, preloading your headset, checking BB play and much more.

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E-Bike Assembly (Boxed)

For your new bike assembly in London and the South East, we’ll handle all the boxed build steps mentioned above and more. This includes inspecting connectors and wiring, performing firmware updates (supported systems) and conducting basic sensor/calibration checks.

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E-Bike Pro Build (Frame-Up)

We’re the trusted choice for your e-bike assembly in London, Surrey and the South East. Wondering how we can help? Your assigned Domex Bikes expert will carry out a full build from the frameset to the parts. This includes your headset, BB installation, steerer cut and more. But that’s not all. They’ll also handle all your internal routing and wiring, if applicable. Plus, we’ll set up your wheel or tubeless tyres, tune your brakes and gears, carry out system checks, etc.

Book E-Bike Pro Build

Kids’ Bike Build (Christmas-Ready)

To create the surprise of a lifetime and light up your child’s face with joy, let us help with a professional kids’ bike assembly that brings convenience to your doorstep. Our at-home bike build in London, Surrey and the South East focuses on age-appropriate setup (lever reach, saddle height) and stabilisers, if needed. We’ll also perform a safety check and present you with a quick how-to as a parent to help the rider make the most out of their riding experience.

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Frame-Up / Pro Build (Non-E-Bike)

When you require a professional build for a non e-bike, let our experts help. We work from the frame up to get you on the road with convenience and confidence. Your Domex Bikes engineer will carry out a full custom build from the frameset and all the components. They’ll help with everything including your headset/BB install, steerer cut, wheel/tubeless setup, precision tuning, etc.

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Turbo Trainer Setup (At Home)

Need a convenient turbo trainer set up done from the comfort of your home or a location of your choice? No problem. Our team can supply and install turbo trainers or set up the one you’ve bought. Additionally, we can fit cassettes/adaptors, stabilise the bike, calibrate the trainer and pair your apps (such as Zwift, TrainerRoad, Rouvy and others).

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Accessory Fit and Setup (Add-ons)

With our expertise and quality workmanship applied to every bike we build and assemble, you can count on us for everything e-bike related. Choose our accessory fitting solutions and take advantage of reliability from us through and through. We can fit or set up all kinds of bike accessories, including pedals, mudguards, racks, bottle cages, lights, GPS mounts, guards and more. Let us help create an amazing riding experience, from a small accessory to larger builds.

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What We Update and Diagnose

Bosch eBike Systems (Smart System and System 2)

Domex Bikes is an approved service for Bosch e-bikes helping you take care of your e-bike and ensuring you are in safe hands.

Shimano STEPS & Di2 (via E-TUBE)

As UK’s first truly mobile service center, Domex Bikes is a proud to be Shimano Service Partner that comes to you. From regular service to necessary software updates our mechanics can assist you with your latest Shimano gear.

What’s Included in Every Domex Build

Structured PDI checklist
Brake setup/bed-in and gear indexing
Wheel true/check, tyre pressures set for rider/use
Short test ride and post-build tips
Proof of professional assembly (handy if your bike/brand requires pro assembly for warranty activation)

How Our Mobile Service Works

Here’s a quick look at how we handle your bike build in London or Surrey:

Book in minutes: Booking with us is easy. You can do so either online or by phone. Tell us what the model of your bike is and where it is located (home/office). We always strive to offer a convenience-first service, which means we come to you.
On-site build and safety check: We bring the workshop stand and tools and run everything through our PDI. Your Domex Bikes expert will start with components such as the frame, handlebars and seat to give shape to your new bike. Next, we install and adjust mechanical systems such as the drivetrain and brake cables. We then fine-tune your gears for smooth shifts and check brakes for sufficient stopping power. Next, there are the final checks and reviews to confirm everything is ready and in order with a heavy focus on safety-first.
Transparent quote and approval: We are all about transparency and consent. With us, you will always get clear quotes. In addition, we ask that you approve any extras or parts before we proceed with any work. This gives you the power and control over your bike build service so that you never go over budget.
Test ride and handover: Finally, we perform a test ride to give you the green light that your bike is ready for the road. After we fine-tune and share setup tips, you’re ready to ride.

Why Choose Domex Bikes

Our mobile bike assembly and build service brings convenience to you. We’re the trusted choice across London and beyond to ensure you get quality workmanship, reliability and professionalism from us. Here’s why Domex Bikes is always the ideal choice:

Certified mechanics for bikes and e-bikes:

Trained on modern drivetrains and e-systems.

We come to you across London, Surrey and the South East:

Save yourself an extra trip. Perfect for busy schedules.

Fast response in peak season:

Extra December availability where possible.

Guaranteed work:

Clear aftercare and support post-build.

Got a new bike for Christmas?

Book an at-home build and first ride setup this week.

Book your build

Is Your Area Covered?

Wondering if we serve your area? Explore our location availability here.

FAQs

Do I need professional assembly for my warranty?
Many brands prefer or require a professional build for warranty validation. We provide proof of professional assembly for your records.
What do you need from me on the day?
The boxed bike, any small parts/accessories that are included, a flat working space and access to the bike’s charger (for e-bikes).
How long does a boxed build take?
Typically 45–90 minutes, depending on the model, and any extras fitted (complex builds take longer).
Do you assemble e-bikes?
Yes. We also carry out visual safety checks and perform firmware/software updates where supported systems allow.
Can you assemble kids’ bikes before Christmas?
Yes. December slots go fast. We encourage you to book early to guarantee your appointment.
What if parts are missing or the box is damaged?
We’ll assess, photograph if needed and advise on the best fix. We can source parts, if required.
Do you offer a post-build check (e.g., 6 weeks)?
Yes, we do. Our 6-week check is available as an add-on to keep shifting and braking dialled after the first rides. Explore more services by visiting our services page.