Project Overview
This scope covers a home addition including sitework, foundation, framing, roofing, mechanical/electrical/plumbing, insulation, drywall, and interior finishes.
Typical Projects Include:
- Single-room addition (bedroom, family room)
- Master suite addition
- Second-story addition
- In-law suite or ADU addition
- Kitchen or dining room bump-out
- Sunroom or four-season room addition
Scope of Work
Foundation & Framing
| Task | Description |
|---|---|
| Sitework & Excavation | Clear the site, excavate for the foundation, and establish drainage. Protect existing landscaping and utilities. |
| Foundation | Pour footings and foundation walls or slab per engineered plans. Waterproof and backfill. |
| Framing | Frame walls, floor (if raised foundation), and roof structure. Tie into the existing house framing. |
| Roofing & Exterior | Install roof sheathing, underlayment, and roofing to match existing. Tie into existing roof. Install siding and exterior trim. |
MEP & Enclosure
| Task | Description |
|---|---|
| Electrical Rough-In | Run circuits, outlets, switches, and lighting from the existing panel or a new sub-panel. Meet current code. |
| Plumbing Rough-In | Extend water supply, drain, and vent lines if the addition includes a bathroom, kitchenette, or laundry. |
| HVAC Extension | Extend existing HVAC or install a new system for the addition. Size for the added square footage. |
| Insulation & Air Sealing | Insulate walls, floor, and ceiling/roof to energy code. Air seal all penetrations and the connection to existing house. |
Interior Finish
| Task | Description |
|---|---|
| Drywall | Hang, tape, mud, and sand drywall on all walls and ceiling. Blend the connection point with the existing house. |
| Flooring | Install finished flooring to match or complement the existing home — hardwood, tile, LVP, or carpet. |
| Trim, Doors & Paint | Install baseboards, casing, crown (if applicable), and interior doors. Paint all surfaces. |
| Fixtures & Punch | Install all light fixtures, outlets, switches, plumbing fixtures, and hardware. Complete punch list and final inspection. |
Timeline & Milestones
A home addition typically takes 3-6 months depending on size, foundation type, and whether it includes a bathroom or kitchen.
| Phase | Duration | Description |
|---|---|---|
| Foundation & Framing | 4-8 weeks | Sitework, foundation, framing, roofing, and exterior enclosure. |
| MEP & Enclosure | 3-5 weeks | Electrical, plumbing, HVAC, insulation, and inspections. |
| Interior Finish | 4-6 weeks | Drywall, flooring, trim, paint, fixtures, and punch list. |
Roles & Responsibilities
Homeowner
- •Approve architectural plans and engineering before construction starts
- •Select all finishes — flooring, fixtures, paint, trim, hardware
- •Provide access and plan for living through construction
- •Process payments per the agreed schedule
General Contractor
- •Manage the full project schedule and all subcontractors
- •Pull all permits and schedule inspections
- •Coordinate the tie-in with the existing house structure and systems
- •Ensure all work meets building code and plan specifications
- •Complete punch list and obtain final inspection sign-off
Materials & Equipment
Foundation & Structure
- •Concrete for footings and foundation
- •Foundation waterproofing
- •Framing lumber and engineered beams
- •Roof trusses or rafters
Exterior & Insulation
- •Roofing materials (matched to existing)
- •Siding materials (matched to existing)
- •Windows and exterior doors
- •Wall, floor, and ceiling insulation
Interior Finish
- •Drywall and joint compound
- •Flooring material
- •Interior doors, trim, and hardware
- •Paint, primer, and caulk
Quality Control Standards
Structural Tie-In
The addition is structurally tied to the existing house per engineered plans. No movement, settling, or separation at the connection.
Weather Tight
Roof, siding, and windows fully sealed. No water intrusion at the tie-in to the existing house.
Seamless Interior Blend
The transition between existing house and addition is seamless — matching floor heights, trim profiles, and paint.
Safety Protocols
Excavation Safety
Call 811 before digging. Locate all underground utilities. Use proper shoring for deep excavations.
Structural Opening
Use temporary shoring and engineered headers when opening the existing wall to connect the addition. Never remove bearing walls without engineering.
Fall Protection
Use proper scaffolding and fall protection for roofing and second-story framing work.
Project Documentation
- Signed contract and scope of work
- Architectural plans and engineering
- Survey and site plan
- Permit and inspection records
- Selection schedule (finishes, fixtures, hardware)
- Change order log
Financial Terms
Payment Structure
Home additions use milestone payments tied to major construction phases.
Terms & Conditions
- •Deposit due at contract signing (typically 10%)
- •Payment at foundation completion
- •Payment at framing and dry-in
- •Payment at drywall completion
- •Payment at flooring and trim
- •Final payment after punch list and final inspection
Acceptance Criteria & Sign-Off
The project is considered complete when the following criteria are met:
- 1Foundation and framing pass structural inspection
- 2Roof and exterior fully weather-tight with no leaks at tie-in
- 3All MEP systems pass inspection and function properly
- 4Drywall, flooring, and trim blend seamlessly with existing home
- 5All fixtures installed and operational
- 6Final inspection passed and certificate of occupancy updated
Frequently Asked Questions
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