Number Plate Fitting Guide: How to Fit Your New Plates

How to fit number plates UK - step-by-step number plate installation guide with legal requirements and tools

Summary

Fitting number plates yourself is legal in the UK provided you follow specific positioning and mounting requirements set out in the Road Vehicles (Display of Registration Marks) Regulations 2001. Plates must be mounted vertically or at a slight angle not exceeding 30 degrees from vertical, with characters clearly visible and unobscured.

The installation process requires basic tools including screwdrivers or a drill, appropriate fixings (screws, bolts, or adhesive pads), and careful attention to plate positioning. Incorrect fitting can result in MOT failure, fines up to £1,000, and enforcement action if plates are not securely attached or are difficult to read.

Number Plate Fitting Guide | Number Plate Maintenance Guide | BS AU 145e Explained Guide

Legal Requirements for Number Plate Fitting

Before fitting your number plates, understanding the legal requirements prevents costly mistakes and enforcement issues.

Positioning Requirements

Front Plate:

Must be fitted to the front of the vehicle
Positioned vertically or within 30 degrees of vertical
Clearly visible from the front of the vehicle
Not obscured by any part of the vehicle

Rear Plate:

Must be fitted to the rear of the vehicle
Positioned vertically or within 30 degrees of vertical
Clearly visible from the rear of the vehicle
Not obscured by tow bars, bike racks, or other accessories

Mounting Requirements

Secure Attachment:

Plates must be firmly fixed to prevent movement
Fixings must not obscure characters or markings
Minimum two fixings per plate recommended
Adhesive pads must be automotive-grade and weather-resistant

Character Visibility:

All characters must be clearly legible
No frames or surrounds that obscure characters
BS AU 145e marking must remain visible
Supplier details must not be covered

Charles Wright Font Guide | BS AU 145e Explained Guide

Tools and Materials Needed for Fitting

Having the right tools before starting makes the fitting process smoother and more professional.

Essential Tools

Tool	Purpose	Notes
Screwdriver (Phillips/Flat)	Removing old plates, fitting screws	Match screw head type
Power Drill	Creating new mounting holes	Use appropriate drill bit size
Spirit Level	Ensuring vertical alignment	Critical for compliance
Measuring Tape	Positioning accuracy	Check symmetry
Cleaning Cloth	Surface preparation	Remove dirt and grease
Isopropyl Alcohol	Surface cleaning for adhesive	Ensures proper adhesion

Fixing Options

Screw Fixings:

Most secure and permanent option
Requires drilling into vehicle bodywork
Stainless steel screws recommended to prevent rust
Rubber washers prevent water ingress

Bolt Fixings:

Used for existing mounting points
No drilling required if holes exist
Nyloc nuts prevent loosening
More secure than screws in some applications

Adhesive Pads:

No drilling required
Must be automotive-grade double-sided tape
3M VHB or equivalent recommended
Not suitable for all vehicle types or plate weights

Combination Approach:

Screws at top, adhesive at bottom
Provides security without excessive drilling
Popular for premium plates (3D, 4D, 5D)

3D Gel Number Plates Explained Guide | 4D Number Plates Explained Guide | 5D Number Plates Explained Guide

Step-by-Step Number Plate Fitting Instructions

Follow these detailed steps for compliant and secure number plate installation.

Step 1: Remove Old Plates (If Applicable)

Preparation:

Park vehicle on level ground
Ensure good lighting conditions
Gather all tools before starting

Removal Process:

Unscrew existing fixings carefully
If adhesive-mounted, use plastic trim tool to gently pry
Clean mounting surface thoroughly
Remove any old adhesive residue

Surface Cleaning:

Wipe with cleaning cloth to remove loose dirt
Apply isopropyl alcohol to remove grease
Allow surface to dry completely
Inspect for rust or damage

Step 2: Position New Plates

Front Plate Positioning:

Hold plate against intended mounting location
Use spirit level to check vertical alignment
Mark fixing hole positions lightly with pencil
Step back and verify visual alignment

Rear Plate Positioning:

Ensure plate does not obscure lights or reflectors
Check tow bar or accessory clearance
Verify BS AU 145e marking will be visible
Confirm supplier details not obscured

Alignment Checks:

Plate should be centred on vehicle where possible
Characters must be horizontal (not tilted)
Minimum 11mm margins must remain visible
No part of vehicle should obscure characters

Step 3: Create Mounting Points (If Required)

Drilling New Holes:

Select appropriate drill bit size for screws
Use centre punch to mark hole locations
Drill slowly to prevent paint damage
Apply touch-up paint to prevent rust

Using Existing Holes:

Check hole condition and thread integrity
Clean holes of any debris or rust
Test fit screws before final installation
Replace damaged fixings as needed

Adhesive Application:

Clean both plate and vehicle surfaces
Apply adhesive pads to plate corners
Remove backing and position carefully
Apply firm pressure for 30 seconds

Step 4: Secure the Plates

Screw Installation:

Insert screws through plate mounting holes
Hand-tighten initially to allow adjustment
Check alignment before final tightening
Tighten securely but do not overtighten

Bolt Installation:

Insert bolts from outside through plate
Secure with nuts on inside of bodywork
Use washers to distribute load
Tighten with appropriate spanner

Adhesive Setting:

Hold plate in position for 30-60 seconds
Do not disturb for minimum 24 hours
Avoid washing vehicle during setting period
Check adhesion after 48 hours

Step 5: Final Compliance Check

Visual Inspection:

All characters clearly visible and legible
No frames obscuring characters or markings
Plate mounted vertically (within 30 degrees)
BS AU 145e marking visible

Security Check:

Plate does not move when gently pushed
All fixings are tight and secure
No rattling when vehicle is driven
Adhesive edges are sealed properly

Documentation:

Keep receipt from plate supplier
Note fitting date for future reference
Photograph installed plates for records
Store supplier details for verification

Number Plate Fitting Guide | Number Plate Maintenance Guide

Special Considerations for Different Plate Types

Different number plate styles may require specific fitting approaches.

Standard 2D Plates

Characteristics:

Flat printed characters on reflective substrate
Lightweight construction
Standard fixing requirements apply

Fitting Notes:

Any fixing method suitable
Adhesive pads work well
Minimal risk of damage during fitting

3D Gel Plates

Characteristics:

Raised gel resin characters (approximately 2mm)
Slightly heavier than standard plates
Gel overlay requires care during handling

Fitting Notes:

Avoid pressing directly on gel characters
Use combination of screws and adhesive
Check gel adhesion after fitting

3D Gel Number Plates Explained Guide

4D Laser-Cut Plates

Characteristics:

Laser-cut acrylic characters (3mm or 5mm)
Heavier than standard plates
Acrylic may crack if overtightened

Fitting Notes:

Do not overtighten screws near acrylic
Consider additional fixing points for security
Handle characters carefully during installation

4D Number Plates Explained Guide

5D Plates

Characteristics:

Combination of 3mm acrylic + 2mm gel (5mm total)
Heaviest premium plate option
Dual-layer construction requires care

Fitting Notes:

Use secure fixing method (screws recommended)
Additional fixing points may be needed
Check both layers remain secure

5D Number Plates Explained Guide

Green Flash Plates (EV)

Characteristics:

Standard plate with integrated green flash
Same weight as equivalent plate type
Green flash positioning must remain visible

Fitting Notes:

Ensure green flash not obscured by frames
Same fitting requirements as standard plates
Check flash visibility after installation

Green Number Plates UK Guide | 5D Plates Electric Vehicles Guide

Common Fitting Mistakes and How to Avoid Them

Understanding common errors helps ensure your installation is compliant and secure.

Mistake 1: Incorrect Plate Angle

Problem: Plate mounted at angle exceeding 30 degrees from vertical.

Consequences: MOT failure likely, ANPR cameras may not read correctly, potential fine up to £1,000.

Solution: Use spirit level during installation, check angle from multiple viewpoints, adjust before final tightening.

Mistake 2: Obscuring Characters with Frames

Problem: Number plate frames cover characters or markings.

Consequences: Illegal under Road Vehicles Regulations 2001, MOT failure guaranteed, enforcement action possible.

Solution: Use frames specifically designed for UK plates, ensure all characters fully visible, check BS AU 145e marking not covered.

Mistake 3: Insufficient Fixings

Problem: Plate secured with only one fixing or weak adhesive.

Consequences: Plate may detach while driving, safety hazard to other road users, potential liability if plate causes accident.

Solution: Use minimum two fixings per plate, choose appropriate fixing for plate weight, check security regularly.

Mistake 4: Damaging Characters During Fitting

Problem: Gel or acrylic characters damaged during installation.

Consequences: Plate appearance compromised, may affect ANPR readability, replacement required.

Solution: Handle plates by edges only, do not press on raised characters, use protective gloves if needed.

Mistake 5: Poor Surface Preparation

Problem: Dirt, grease, or rust prevents proper adhesion.

Consequences: Adhesive failure over time, plate may detach in adverse conditions, water ingress causes corrosion.

Solution: Clean surface thoroughly before fitting, use isopropyl alcohol for final clean, allow surface to dry completely.

Replacement Number Plates UK Complete Buying Guide | Number Plate Fines UK Guide

MOT Requirements for Number Plate Fitting

MOT testers check number plate fitting as part of every vehicle test. Understanding these requirements prevents test failures.

MOT Inspection Criteria

Visibility Check:

Plates must be clearly visible from front and rear
No obstructions including frames, covers, or dirt
Characters must be legible from reasonable distance

Security Check:

Plates must be securely attached
No excessive movement when tested
Fixings must not be corroded or damaged

Condition Check:

No cracks affecting readability
No significant fading or discolouration
Characters must not be peeling or detached

Common MOT Failures Related to Fitting

Issue	Result	Fix Required
Plate loose or moving	FAIL	Re-secure with appropriate fixings
Characters obscured	FAIL	Remove obscuring frames or covers
Plate angle incorrect	FAIL	Re-mount within 30 degrees of vertical
BS AU 145e marking hidden	FAIL	Reposition to show marking
Damaged mounting points	FAIL	Repair or create new mounting points

Pre-MOT Checklist

Before your MOT test, verify:

Both plates securely attached
All characters clearly visible
No obscuring frames or covers
Plates clean and legible
BS AU 145e marking visible (post-2021 plates)
No cracks or significant damage

BS AU 145e Explained Guide

Maintenance and Long-Term Care

Proper maintenance extends plate life and maintains compliance over time.

Regular Inspection Schedule

Monthly Checks:

Visual inspection of plate condition
Check fixings remain tight
Verify characters still legible

Seasonal Checks:

After winter, check for salt damage
Before MOT, verify security
After long journeys, inspect condition

Annual Deep Clean:

Remove plates if possible
Clean mounting surface
Check for corrosion under plate
Re-secure with fresh fixings if needed

Cleaning Guidelines

Safe Cleaning Methods:

Use mild car shampoo and soft cloth
Avoid abrasive cleaners or brushes
Rinse thoroughly after cleaning
Dry with soft microfiber cloth

What to Avoid:

Pressure washers at close range
Solvent-based cleaners
Stiff brushes or scouring pads
Ice scrapers on plate surface

Character Care:

3D/4D/5D gel and acrylic needs gentle cleaning
Do not pick at raised characters
Avoid parking under trees (sap damage)
Remove bird droppings promptly

Number Plate Maintenance Guide

When to Seek Professional Fitting Help

Some situations warrant professional installation rather than DIY fitting.

Situations Requiring Professional Help

Complex Mounting:

Vehicles with non-standard mounting points
Classic cars requiring careful handling
Commercial vehicles with special requirements

Premium Plates:

Expensive 4D or 5D plates
Custom plates with high value
Plates requiring special handling

Damage Concerns:

Risk of paint damage during drilling
Existing corrosion at mounting points
Previous fitting attempts failed

Our Ilford Workshop Services

Same-Day Collection

Eastern Avenue, Ilford, East London. Collect and fit while you wait. Professional fitting advice included.

Fitting Assistance

Staff can advise on best fixing methods, demonstrate proper fitting techniques, and answer compliance questions.

Local Coverage

Service across East London including Barking, Romford, Dagenham areas. Next-day UK delivery for remote customers.

Same Day Number Plates Ilford Guide | Number Plate Delivery Times Guide

Frequently Asked Questions

Yes, you can legally fit number plates yourself provided the plates were manufactured by a DVLA-registered supplier (RNPS) and you have proper documentation proving entitlement to the registration mark. Plates must be mounted vertically or within 30 degrees of vertical, with all characters clearly visible and unobscured.

Essential tools include a screwdriver or power drill for fixings, a spirit level to ensure vertical alignment (critical for compliance), measuring tape for positioning accuracy, and cleaning materials like isopropyl alcohol for surface preparation. For adhesive fitting, use automotive-grade double-sided tape such as 3M VHB.

Yes, adhesive pads are acceptable if automotive-grade double-sided tape (like 3M VHB) is used, the mounting surface is thoroughly cleaned and dried, and the plate weight is suitable for adhesive fixing. However, screws provide more secure attachment, especially for heavier premium plates like 4D or 5D styles.

Common MOT failures include: plates mounted at angles exceeding 30 degrees from vertical, frames obscuring characters or BS AU 145e markings, insufficient fixings causing plate movement, and damaged mounting points. Testers also fail plates with obscured characters, incorrect font, or missing supplier details.

Screws should be tightened securely enough to prevent plate movement but not so tight that they crack the plate material or strip threads - particularly important for premium plates with gel or acrylic characters. Hand-tighten initially to allow alignment adjustments, then final-tighten with moderate pressure.

Charles Wright Font Guide | BS AU 145e Explained Guide

This guide references the following official and verified sources:

Road Vehicles (Display of Registration Marks) Regulations 2001 (SI 2001/561)

www.legislation.gov.uk

DVLA Official Guidance - Displaying Number Plates Rules

Official government guidance on number plate display requirements

www.gov.uk

British Standards Institution - BS AU 145e:2018 Specification

knowledge.bsigroup.com

MOT Inspection Manual - DVSA

www.gov.uk

Vehicle Excise and Registration Act 1994 - Section 42