Best Security Letterboxes Deals Online in the UK (25 Deals Found)

Last Updated - 09/09/2026 Sort By:

Best Choice
HomeSecure

New
Home Secure Letterbox Lock – Internal Letterbox Security Swing Lock for uPVC & Composite Doors – Anti-Fishing Mail Guard
ANTI-ARSON & MAIL THEFT PROTECTION: Helps protect your home from letterbox attacks by restricting access to the letterbo

£7.99
Best Value
UAP

New
UAP Stainless Steel Hidden Fix Letterplate Restrictor Shrouds - Letterbox Cowl Visor Guard for Extra Security (Mirror Po
PROMOTES SAFETY AND SECURITY: The UAP Screw Fix Letterplate Restrictor Shroud helps to keep your home safe with its simp

£12.99
New
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock
Suitable for window door locking, opening and closing handle lock for you to use. 1 Window lock. i3.75bbowL5owL58z" styl

£1.93
MSMXCS

New
2PCS Door Letter Box Flap Sash Jammers Window Locks Security Cover White
Package Contents: This window lock comes in a set of two, featuring T-shaped locks. It inherits exquisite craftsmanship,

£5.49
New
Wall Mounted Letter Post Box Lockable Mailbox Waterproof Steel Letterbox 2x Keys

£24.99
Homewatch

New
Homewatch Letterplate Restrictor Shroud Cowl Visor Guard - Letterbox Cover for Extra Security - Silver Grey - Hidden Fix
Letterbox security device

£14.99
HomeSecure

New
Fire Proof Retardant Letterbox Bag. Dog Proof Mail Catcher. Internal Letter Box Cover. Extra Security
EASY & QUICK INSTALLATION: Easily fitted in minutes to most door types, including uPVC, using basic household tools — id

£109.99
New
Fire Proof Retardant Resistant Security Letterbox Bag. Internal Security Cover
The letterbox can be securely locked closed when required. Fire Proof Retardant Resistant Security Letterbox Bag. Intern

£109.99
Blockabox

New
Blockabox – White Coloured Powder Coated Anti Arson Letterbox, Letterbox Cover, Letter Box Blocker, Empty & Void Propert
Quick and Easy Installation: Equipped with a user-friendly design, BLOCKABOX can be securely fitted within just three mi

£29.00
New
Secure steel Gate and Railings Postbox, Rear Collection, Manufactured by seller
Our standard and most popular colour is Black although we can powder coat to any standard RAL colour. Suitable for mount

£89.00
UAP

New
UAP Stainless Steel Hidden Fix Letterplate Restrictor Shrouds - Letterbox Cowl Visor Guard for Extra Security (White)
PROMOTES SAFETY AND SECURITY: The UAP Screw Fix Letterplate Restrictor Shroud helps to keep your home safe with its simp

£14.99
FIGCY

New
Window Locks for UPVC Windows and Doors, 2-Pack Durable Security Locks, Easy to Install, for Home Door Security and Lett
✅【Enhance Home Security】: These T-handle window locks are perfect for UPVC windows and doors, providing an added layer o

£4.99
New
Steel Wall Mount Mail Letter Box Lockable Post Mailbox Postbox Secured Letterbox
It has a lock to ensure security and privacy. 1 x Galvanized Steel Parcel Box. Material: Galvanized Steel. Full front do

£12.95
UAP

New
UAP Screw Fix Letterplate Restrictor Shrouds - Letterbox Cowl Visor Guard for Extra Security (Black)
PROMOTES SAFETY AND SECURITY: The UAP Screw Fix Letterplate Restrictor Shroud helps to keep you and your home safe with

£19.99
New
High Security Letterbox
Upgrade your front door security with the Trojan TS008, one of the most secure letter plates on the market. Engineered t

£21.50
X

New
Letterbox Guard – Anti Arson & Unwanted Mail Blocker – Fire-Resistant Foam Gasket – Powder Coated Steel – Disables Lette
White powder-coated steel letterbox guard – Blocks the letterbox opening to deter arson attempts, vandalism and unwanted

£28.99
New
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock
Suitable for window door locking, opening and closing handle lock for you to use. 1 x Window lock. Provides extra securi

£2.08
New
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock. Suitable for window door locking, opening and c

£2.94
New
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock
Suitable for window door locking, opening and closing handle lock for you to use. 1 x Window lock. Provides extra securi

£1.91
New
MailPlate 12'' Polished Chrome Letterbox: Stylish, Secure, and Draught Proof
Don’t settle for ordinary when you can invest in a letterbox that reflects your style and values. Stylish, Secure, and D

£24.99
New
New Nanocast hidden fix security hood letterbox. Grey
New Nanocast hidden fix security hood. Each one has a slight imperfection or small scratch in the finish, see photos for

£5.45
New
Lockable Wall Mounted Post Parcel Box - Secure Mail Letter Box
Features a lockable internal flap with two sets of keys. Whether you're planning to treat yourself to a new garden bench

£35.00
New
Lockable Wall Mount Parcel Box Letterbox Post Box Slots Letters Safe Parcel Note
Lockable Wall Mount Parcel Box Say goodbye to waiting in for parcels and the dreaded "Sorry We Missed You" cards through

£67.95
New
Mailguard Anti Arson Mailbag with lockable letterbox security plate fire safety
Protection against the increasing risk of arson attacks. Fits centrally over the letterbox on the inside of the door (Ap

£129.99
New
Yale Trojan TS008 Unicorn Security Letter-plate, 40-75mm 0793-2003-BK-WH-FD
Keep your letters safe with the Yale Trojan TS008 Unicorn Security Letter-plate. This stylish and durable letterbox is m

£19.99

25 Security Letterboxes deals are available from: Amazon, eBay stores, starting from £1.91.
The biggest discount we found is 10%% on Home Secure Letterbox Lock – Internal Letterbox Security Swing Lock for uPVC & Composite Doors – Anti-Fishing Mail Guard – Easy Fit with Fixings at Amazon.
The lowest price we found is £1.91 while the highest is £129.99.
Prices for the best Security Letterboxes deals average at £32.00.
Last updated on September 9, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Security Letterboxes.