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Home Addition Construction Plans

Build Your Home Addition from one of our building plans


From bay windows to master bedrooms, make the most of your existing house with these proven and popular additions.


All of our plans come with comprehensive, easy-to-follow instructions and diagrams and include a complete materials list.

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Shed Sunroom Addition
Shed Sunroom Addition

Add Space & Increase the Value of Your Home!

Three Sizes Included:

  • 8’ x 14’
  • 12’ x 17’
  • 14’ x 20’

4/12 Pitch Shed Roof with 3 Large Skylights. Includes Sliding Glass Doors & Large Windows. Complete & Easy-to-Follow Instructions Save Time, Cut Waste. Full Materials Lists Included for Mistake-Free Pricing.

Plans Include:

  • Wall & Roof Framing Plans
  • Rafter Cutting Templates
  • Skylight Framing Details
  • 3-D Cut-Away Drawings
Item No. 90021

Gabled Sun Room Addition
Gabled Sun Room Addition

Add Space & Increase the Value of Your Home!
Three Sizes Included:

  • 12’ x 12’
  • 14’ x 14’
  • 16’ x 16’
  • 8/12 Gable Roof Attaches to Existing Roof or Two-Story Wall

Plans Include:

  • Wall & Roof Framing Plans
  • Rafter Cutting Templates
  • Roof Sheathing Layout
  • Door & Window Details
  • 3-D Cut-Away Drawings
  • Full Materials Lists Included

Includes Atrium Door, Large Windows & Half-Round Transom Window. Complete & Easy-to-Follow Instructions Save Time, Cut Waste.

Item No. 90022

Bay Window Addition
Bay Window Addition

Great Addition for a Breakfast Nook!

Four Sizes Included:

  • 2'-0" x 4'-0"
  • 2'-0" x 6'-0"
  • 2'-6" x 4'-0"
  • 2'-6" x 6'-0"

Plans Include:

  • Floor, Wall & Roof Framing Plans
  • Rafter Cutting Templates
  • Shingle Installation Instructions
  • 3-D Cut-Away Drawings
Full Materials Lists Included for Mistake-Free Pricing. Includes 8/12 or 12/12 Pitch Hip Roof Options. Complete & Easy-to-Follow Instructions Save Time, Cut Waste. Includes Base Lattice Trim

Item No. 90023

14x14 Office Addition
14x14 Office Addition

Add Home Workspace and Value to Your Home, Three Roof Options to Complement your Existing Roof Style, Complete and Easy to Follow Instructions, Full Materials Lists Included for Mistake-Free Pricing

Plans Include:

  • Details for Full Basement, Crawl Space and Slab Foundations in Concrete or Block Construction
  • Floor and Roof Framing Plans
  • Cross-Sectional Details
  • Rafter Cutting Templates
Item No. 90026

18x24 Master Bedroom Addition
18x24 Master Bedroom Addition

Add Space and Value to Your Home Features Elegant Bay Window in Whirlpool Tub Area. Three Roof Options to Complement Your Existing Roof Style. Floor Plans Provided 2 Ways; With 18' or 24' Dimension Against the House, to Fit Any Lot Size or Existing Home. Full Materials Lists Included for Quick, Mistake-Free Pricing.

Plans Include:

  • Floor and Roof Framing Plans
  • Details for Full Basement, Crawl Space and Slab Foundations in Concrete or Block Construction
  • Rafter Cutting Templates
  • Cross-Sectional Details
  • Roof Sheathing Layout
Item No. 90027

Sunny Sun Room Shelter - Sun Room Home Addition
Sunny Sun Room Shelter - Sun Room Home Addition

Bright by day or night, this jewel-like sun-room looks like a traditional conservatory. Screens form the walls, but vinyl panels can be added to hold off wind and rain. The roof consists of inexpensive clear-plastic panels available at home improvement stores. The finished room measures about 14 x 14 x 16 feet high.

Detailed step-by-step instructions, full-size patterns, materials list, and building instructions are included in this professionally drawn blueprint.

Item No. 501916

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