12x18 Room Addition Plans
Budget: $250 – $750 USD
I’m adding a 12 ft × 18 ft living space to my home and need a concise set of construction drawings I can hand to my local permit office and builder. The new room attaches to the existing house on one side; the other three exterior walls will be finished in LP SmartSide siding in a dark color.
Key design notes
• Foundation: 4-ft poured concrete short wall with footer.
• Framing: conventional 2 × 4 studs.
• Roof: gable style with engineered trusses and asphalt shingles.
• Openings: two 36 × 72 double-hung windows opposite a 6-ft patio door; four 42 × 72 picture windows on the gable end.
• Interior finish: drywall throughout.
• HVAC: wall-mounted mini-split unit (indicate line-set and condensate route).
I’m looking for a straight-forward drawing package that includes:
1. Scaled floor plan with dimensions and window/door schedule.
2. Foundation plan and section showing wall height, rebar, and footer.
3. Wall framing elevations and basic fastening details for LP SmartSide.
4. Roof plan with truss layout and connection notes.
5. Exterior elevations illustrating siding, windows, and roof pitch.
6. Simple electrical/HVAC rough-in locations (outlets, mini-split head, exterior condenser pad).
Keep the documentation clear and code-compliant so my local inspector can review it quickly. A PDF set is all I need; source files (DWG or similar) are a welcome bonus but not mandatory.
Key design notes
• Foundation: 4-ft poured concrete short wall with footer.
• Framing: conventional 2 × 4 studs.
• Roof: gable style with engineered trusses and asphalt shingles.
• Openings: two 36 × 72 double-hung windows opposite a 6-ft patio door; four 42 × 72 picture windows on the gable end.
• Interior finish: drywall throughout.
• HVAC: wall-mounted mini-split unit (indicate line-set and condensate route).
I’m looking for a straight-forward drawing package that includes:
1. Scaled floor plan with dimensions and window/door schedule.
2. Foundation plan and section showing wall height, rebar, and footer.
3. Wall framing elevations and basic fastening details for LP SmartSide.
4. Roof plan with truss layout and connection notes.
5. Exterior elevations illustrating siding, windows, and roof pitch.
6. Simple electrical/HVAC rough-in locations (outlets, mini-split head, exterior condenser pad).
Keep the documentation clear and code-compliant so my local inspector can review it quickly. A PDF set is all I need; source files (DWG or similar) are a welcome bonus but not mandatory.