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

Last Updated - 19/06/2026 Sort By:

Best Choice
keypak

New
Keypak 344mm Letterbox Security Cowl – Anti-Fishing Plate & Letter Box Shield for uPVC, Composite & Timber Doors (Silver
SECURITY ENHANCEMENT: Adds an extra layer of protection to your letterbox by preventing unauthorised access through the

£8.99
Best Value
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
New
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock. Product Type: Window Lock / Sash Blocker. 1 × W

£1.86
Yale

New
Yale P-YLPR-CH Letterplate Restrictor, Polished Chrome Finish, High Security, Visi Packed, Suitable for Wooden, PVCu and
Easy to install

£10.52
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
MSMXCS

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

£5.38
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
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
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
Large letterbox Security Mailbox Wall-Mounted Post Box waterproof heavy-duty
Choose your favourite of the available colours! Details on the Large Letterbox. Wall Letterbox with Security Flap. • Let

£117.90 £131.90
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
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
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
HomeSecure

New
FlapGUARD Lockable Letterbox Security Cover Internal Letter Plate Mail Guard Anti-Arson & Anti-Fishing. Easy Fit with Fi
LOCKABLE LETTERBOX SECURITY COVER: Premium steel security cover that fits over your existing letter plate to prevent una

£47.99
New
Door Letterbox Security Cowl 13" 344mm Key Fishing Blocker Hood Guard Visor
This steel letterplate restrictor shroud effectively prevents key fishing attempts, acting as a strong deterrent against

£9.99
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
New
White Visor Guard, Letter Box Guard, Letterbox Cover. Extra Security
'Letterbox NOT Included'. One size that is Suitable for a 10" or 12" Letterbox. Thieves also try and evaluate the assets

£10.64
New
GR Post Box-Wall/pillar Mount Letter Box withLock secure Mailbox outdoor
With four small holes on the bottom, you can easily mount it on a stand or wall. This is a rustic item in regards to cas

£127.95
New
Letterbox Security Cover Guard. Letterbox Swing Lock Door Security Lock
Product Type: Window Lock / Sash Blocker. 1 × Window Lock. ✅ Key Features Actual color may slightly vary due to monitor

£2.39
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
New
PIP BOXES ROYAL MAIL LARGE LETTER BROWN C6 C5 C4 SECURE MAILING SHIPPING POSTAL
PIP 4 C4 Die-Cut – 322 × 229 × 20 mm (Large Letter). PIP 2 C6 Die-Cut – 160 × 112 × 20 mm (Large Letter). PIP 3 C5 Die-C

£126.99
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
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

£2.45
New
Personalised Large Black Wall-Mounted Lockable Letterbox Secure Post Mail Box
📦 1 xPersonalised Modern Letterbox. ✔Secure & Functional – Lockable design with 2 keys for added protection. All trade

£45.99
New
Magman® | Letterbox Security Guard - Home Phishing Preventing Screw On Cover
The Magflap™ Letterbox Extra security letterbox guard | Easy fit in minutes for peace of mind prevents fishing and peepi

£18.95

25 Security Letterboxes deals are available from: Amazon, eBay stores, starting from £1.86.
The biggest discount we found is 10%% on Keypak 344mm Letterbox Security Cowl – Anti-Fishing Plate & Letter Box Shield for uPVC, Composite & Timber Doors (Silver) at Amazon.
The lowest price we found is £1.86 while the highest is £127.95.
Prices for the best Security Letterboxes deals average at £38.37.
Last updated on June 19, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Security Letterboxes.