Best Letterboxes & House Numbers — Plastic (2026)
1 letterboxes & house numbers matching material “Plastic”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Letterboxes & House Numbers UK (2026) guide.
These plastic letterboxes offer a cost-effective and durable solution for displaying mail on your property. Constructed from robust, weather-resistant polyethylene, they’re designed to withstand the elements and provide long-lasting performance, even in exposed locations. Their simple design ensures easy installation and minimal maintenance – perfect for homeowners looking for a practical and affordable way to manage their correspondence.
These letterboxes are ideal for areas where traditional materials like cast iron or wood might prove too heavy, expensive, or prone to rust. The plastic construction significantly reduces these concerns, making them suitable for balconies, porches, and other exterior spaces. They’re also lighter than metal options, simplifying transportation and installation.
Alongside the letterboxes, we've included a selection of plastic house numbers, designed to complement the aesthetic of your property. These numbers are equally durable and weather resistant, ensuring they maintain their clarity and readability for years to come. Matching the robust nature of the letterboxes, these numbers provide a complete solution for clearly identifying your home.
#1 Pick
Stormguard 06SR0150000W Internal PVC Letter Box Brush Cover, 335 x 75mm, White- Plastic
- White
£6.73
Pros
- White PVC finish blends in on light-coloured composite and uPVC doors
- Brush seal helps cut draughts through the letterbox aperture
- Over 1,800 reviews make it one of the most trusted covers on Amazon UK
Cons
- PVC surround is less durable than a metal cover on heavily used doors
FAQ
What is the plastic used in these letterboxes made from?+
These letterboxes are typically manufactured using polyethylene (PE), a strong and durable thermoplastic known for its resistance to UV degradation and weathering. This ensures they maintain their colour and structural integrity outdoors.
How weatherproof are these plastic letterboxes?+
The polyethylene used is formulated to resist moisture, rain, and frost. While not fully submersible, they offer good protection against the elements, extending their lifespan when exposed to typical UK weather conditions.
Are these letterboxes suitable for use in coastal areas?+
While designed for general outdoor use, prolonged exposure to saltwater environments could potentially accelerate degradation over time. Regular cleaning and occasional checks are recommended if located near the coast.
How easy are these plastic letterboxes to install?+
Installation is straightforward – typically involving simply screwing the bracket into a wall or fence post. No specialist tools are required, making it a DIY-friendly project.
What size are the available house numbers?+
We offer house numbers in standard sizes ranging from 10mm to 30mm high, allowing you to choose the perfect fit for your property's dimensions. Please check the product description for specific measurements.
Can these plastic letterboxes be painted?+
The polyethylene is generally paintable with exterior acrylic paints. However, it’s recommended to use a primer first to ensure optimal adhesion and longevity of the paint finish.
Are these plastic letterboxes suitable for mounting on brick or concrete?+
Yes, they come with appropriate brackets for secure attachment to both brick and concrete surfaces. Ensure the surface is clean and dry before installation.
Do the house numbers include fixings?+
The plastic house numbers are supplied with screws suitable for standard wall fixing. However, we recommend using appropriate fixings for your specific wall type.
What is the colour of the plastic letterboxes and house numbers?+
These items are typically available in a range of colours including white, black, grey, and beige to complement various property styles. Specific colours may vary depending on the product listing.
How do I clean these plastic letterboxes?+
Regular cleaning with warm water and a soft brush is recommended. Avoid using harsh chemicals or abrasive cleaners that could damage the surface finish.