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Rapid Build Home Extension Kits to make life easier for you.

  • SIPs
  • Garden Rooms
  • Building with SIPs
    • Modular House Extensions
    • Garden Offices
    • Garden Gyms
  • Case Studies
  • Key Information
    • About Extension Kitz
    • Build Assist
    • Building Regulations
    • Planning Applications
    • FAQs
    • Environment
    • Downloads
  • Gallery
  • Contact
extension kitz logo

Build it faster, warmer,
stronger and smarter

  • SIPs
  • Garden Rooms
  • Building with SIPs
    • Modular House Extensions
    • Garden Offices
    • Garden Gyms
  • Case Studies
  • Key Information
    • About Extension Kitz
    • Build Assist
    • Building Regulations
    • Planning Applications
    • FAQs
    • Environment
    • Downloads
  • Gallery
  • Contact
Extension Kitz

Build it faster, warmer,
stronger and smarter

sip gallery kershaw before
Before
sip gallery kershaw base
Base level
sip gallery kershaw sip panels erected
SIP panels erected
sip gallery kershaw sip panel erected
SIP panels erected
Board roof
Board roof
sip gallery kershaw office interior
Office interior
sip gallery kershaw interior of skeleton
Interior of skeleton
sip gallery kershaw skeleton building
Skeleton building
sip gallery full build
Full build
sip gallery kershaw battened roof
Battened roof
membrane side for brick slip
Brick slip former
sip gallery kershaw plaster interior
Plaster interior
sip gallery kershaw after with composite door
After with composite door
sip gallery kershaw bifold grey looking through
After with Bi-fold grey door

Head Office

Cemetery Works,
Cemetery Road,
Radcliffe,
Greater Manchester,
M26 4FT

sales@extensionkitz.co.uk

0330 166 0877

Extension Kitz

"Build it faster, stronger, warmer and smarter"

We are an established, family run, innovative manufacturer and supplier of Structurally Insulated Panels (SIPs) for single storey home extensions, annexes, pods, garden rooms, and modular educational buildings.

Quick Links

  • What is a SIP Panel?
  • What is an Extension Kit?
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Copyright © 2025 Extension Kitz

  • Call us on 0330 166 0877