Custom Home Additions & Extensions in Westchester & NYC

Expand your home with high-quality design-build construction tailored to your space, lifestyle, and long-term value.

When your home no longer fits your needs, moving isn’t your only option. At HammerTime Construction Group, we specialize in custom home additions that give you more space, better functionality, and increased property value — without leaving your neighborhood.



Whether you're looking to build a rear extension, second-story addition, or expand your living space, we deliver high-end construction with a seamless finish that matches your home perfectly.

TYPES OF HOME ADDITIONS

We design and build a wide range of additions:



  • Rear Extensions: Expand your kitchen, living room, or open-concept layout.
  • Second-Story Additions: Add an entire new level to your home.
  • Side Extensions: Maximize unused space on your property.
  • Room Additions: Bedrooms, home offices, family rooms, and more.
  • Garage Conversions: Turn unused garages into livable space.


👉 Every addition is fully customized to your home and goals.

DESIGN-BUILD APPROACH

Unlike basic contractors, we offer a complete design-build service:

  • Architectural planning 
  • Structural engineering 
  • Permit approvals 
  • Material selection 
  • Full construction management

👉 You work with one team from start to finish — no confusion, no delays.

OUR PROCESS

1

Consultation
We evaluate your home, goals, and expansion possibilities.

2

Planning & Design
We create detailed plans and layouts.

3

Permits & Compliance
We handle all required permits and inspections.

4

Construction
Our team builds your addition with precision and quality.

5

Final Walkthrough
We ensure everything meets your expectations.

COST OF HOME ADDITIONS

Home additions are one of the most valuable investments you can make.

Typical ranges

  • Small Additions: $80,000 – $150,000 
  • Mid-Size Additions: $150,000 – $300,000 
  • Large / Second-Story Additions: $300,000 – $500,000+

Factors affecting cost:

  • Size and square footage 
  • Structural complexity 
  • Foundation work 
  • Materials and finishes 
  • Permits and zoning

👉 Every project is fully managed — from design to construction.

PROJECT GALLERY

WHY CHOOSE HAMMERTIME

20+ Years of Experience

Licensed & Insured

Design-Build Expertise

High-End Craftsmanship

Full Project Management

Local Knowledge of Westchester & NYC

Serving Westchester & NYC

FAQ

  • How long does a home addition take?

    Typically 3–6 months depending on size and complexity.

  • Do I need permits?

    Yes — we handle all permits and approvals.

  • Will the addition match my home?

    Yes, we design additions to blend seamlessly with your existing structure.

Get in Touch

Questions or Project Ideas? Reach Out Today

Our team is ready to discuss your construction needs and provide expert guidance. Use the contact form to start your consultation or request more information.

Call Us

(917) 920-7826

Connect with Us

Business Hours

Mon - Sun
Open 24 Hours