Top-rated addition to existing structure builders.

Get matched with top addition to existing structure builders in your area

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Addition to existing structure builders in Northumberland

JJS Custom Carpentry
363 Captain Bloom Road, Unit 437S
5.00(
1
)
Approved Pro
JJS Custom Carpentry
363 Captain Bloom Road, Unit 437S
5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
13 years of experience

At JJS Custom Carpentry, we pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all the work we perform. We are experts, and will always keep you educated about the work process. We look forward to earning your business!

"He did a great job here!"

Stacey M on April 2020

At JJS Custom Carpentry, we pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all the work we perform. We are experts, and will always keep you educated about the work process. We look forward to earning your business!

"He did a great job here!"

Stacey M on April 2020


Avatar for John's Small Jobs Services
John's Small Jobs Services
373 Airport Rd
4.21(
14
)
Approved Pro
John's Small Jobs Services
373 Airport Rd
4.21(
14
)
Approved Pro
Customers say: True professional
107 local quotes requested
8 years of experience

Ready to remodel your home? John Small Jobs Services is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than a 7 years of experience serving Sunbury, and surrounding areas. There is no job too big, or too small for our team. Call now and let us put our experience to work for you!

"It was tremendous. Totally trustworthy and I didn't even worry about him being there. Because he ensured that the job was completed and have absolutely no problems with them. I highly recommend him using the service. He was well prepared and had all paint covers and such that he would need. He completely cleaned up the job afterwards so you wouldn't know he was there. He is totally trustworthy and I didn't mind leaving him down while he's working. It's fine and I never worried about one thing."

Andy R on July 2024

Ready to remodel your home? John Small Jobs Services is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than a 7 years of experience serving Sunbury, and surrounding areas. There is no job too big, or too small for our team. Call now and let us put our experience to work for you!

"It was tremendous. Totally trustworthy and I didn't even worry about him being there. Because he ensured that the job was completed and have absolutely no problems with them. I highly recommend him using the service. He was well prepared and had all paint covers and such that he would need. He completely cleaned up the job afterwards so you wouldn't know he was there. He is totally trustworthy and I didn't mind leaving him down while he's working. It's fine and I never worried about one thing."

Andy R on July 2024


Avatar for Tradesman Construction
Tradesman Construction
8 Mountain Road
5.00(
4
)
Approved Pro
Tradesman Construction
8 Mountain Road
5.00(
4
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
1310 local quotes requested

Family-owned business with over 19 years of experience - Remodeling - General - Remodeling - Kitchen & Bathroom- Basement Remodels - Room Additions-

"We were very pleased with our basement finish. Tradesman worked with us to make a design plan that worked well for us and our budget. They were good communicators and did their very best to fix some issues due to inspector’s change in requirements. Would highly recommend."

Douglas T on December 2024

Family-owned business with over 19 years of experience - Remodeling - General - Remodeling - Kitchen & Bathroom- Basement Remodels - Room Additions-

"We were very pleased with our basement finish. Tradesman worked with us to make a design plan that worked well for us and our budget. They were good communicators and did their very best to fix some issues due to inspector’s change in requirements. Would highly recommend."

Douglas T on December 2024


Avatar for Lux Renovations LLC
Lux Renovations LLC
60 Shawmut Rd
4.43(
119
)
Approved Pro
Lux Renovations LLC
60 Shawmut Rd
4.43(
119
)
Approved Pro
Customers say: Quality work
988 local quotes requested
23 years of experience

Lux Renovations is the exclusive New England provider of the award winning Owens Corning Basement Finishing System. We have multiple full time crews waiting to help you with your project today. From Cape Cod and the Islands to Greenwich Connecticut, Framingham Massachusetts to Hampton New Hampshire and all points in between. We have helped thousands of homeowners transform their unused basements into warm, inviting spaces to be enjoyed by family and friends for decades to come. Finishing your basement not only adds value to your home but greatly increases functionality. Whether you’re looking for a workout room, an office, or an additional space to entertain, we can have your brand new space built and ready for use in just a few weeks, NOT months. Call to schedule an appointment to unlock the full potential of your basement. 800-639-3008

"Everything went very smoothly. The workers were prompt, efficient, and friendly. The quality of the work was excellent."

Selina W on February 2025

Lux Renovations is the exclusive New England provider of the award winning Owens Corning Basement Finishing System. We have multiple full time crews waiting to help you with your project today. From Cape Cod and the Islands to Greenwich Connecticut, Framingham Massachusetts to Hampton New Hampshire and all points in between. We have helped thousands of homeowners transform their unused basements into warm, inviting spaces to be enjoyed by family and friends for decades to come. Finishing your basement not only adds value to your home but greatly increases functionality. Whether you’re looking for a workout room, an office, or an additional space to entertain, we can have your brand new space built and ready for use in just a few weeks, NOT months. Call to schedule an appointment to unlock the full potential of your basement. 800-639-3008

"Everything went very smoothly. The workers were prompt, efficient, and friendly. The quality of the work was excellent."

Selina W on February 2025


Avatar for D.R. Graybill Services
D.R. Graybill Services
6919 Heister Valley Rd
5.00(
1
)
Approved Pro
D.R. Graybill Services
6919 Heister Valley Rd
5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
812 local quotes requested

We are a general contracting business with over 30 years of experience with an uncompromising mission to provide superior craftsmanship, dedication and attention to detail that surpasses customers expectation and that creates added value to property and increase satisfaction of ownership. We serve residential and commercial customers and specialize in affordable custom design with expert experience in all areas of the contracting trades from foundation to high quality finish work. We do renovations, remodeling, property restorations, and historic preservation work to the highest standards, no job is too small or large. Over the years our business has had the privilege to served hundreds of satisfied customers and we look forward to working with you. Give us a call, we will never compromise in our efforts to be a company of the highest standards of integrity, transparency, trust, and excellence in all we do and we thank you in advance for contacting us for your project. We remain determined to be the best and to exceed expectations!

"Excellent. Great Consultation"

Cliff A on June 2024

We are a general contracting business with over 30 years of experience with an uncompromising mission to provide superior craftsmanship, dedication and attention to detail that surpasses customers expectation and that creates added value to property and increase satisfaction of ownership. We serve residential and commercial customers and specialize in affordable custom design with expert experience in all areas of the contracting trades from foundation to high quality finish work. We do renovations, remodeling, property restorations, and historic preservation work to the highest standards, no job is too small or large. Over the years our business has had the privilege to served hundreds of satisfied customers and we look forward to working with you. Give us a call, we will never compromise in our efforts to be a company of the highest standards of integrity, transparency, trust, and excellence in all we do and we thank you in advance for contacting us for your project. We remain determined to be the best and to exceed expectations!

"Excellent. Great Consultation"

Cliff A on June 2024


Rock-A-Fellas Co Inc
6960 Fowler St
4.45(
22
)
Rock-A-Fellas Co Inc
6960 Fowler St
4.45(
22
)
Customers say: Quality work
22 years of experience

Rock-A-Fellas Contracting is dedicated to providing quality product at affordable prices. Rock-A-Fellas Contracting Company is a subchapter S corporation and is fully licensed and insured. Attention to detail is our trademark. The end product is exceptional in quality while still being affordable. Rock-A-Fellas Contracting can service all of your home improvement needs - inside and out. From renovating your kitchen or refinishing your basement to installing new fences, entry doors or windows. We speccialize in site preparation. Our customized foundations provide the needed stable and secure base for your structure. They are visually more appealing than traditional cinderblocks as well as more economical than cement pads.

Rock-A-Fellas Contracting is dedicated to providing quality product at affordable prices. Rock-A-Fellas Contracting Company is a subchapter S corporation and is fully licensed and insured. Attention to detail is our trademark. The end product is exceptional in quality while still being affordable. Rock-A-Fellas Contracting can service all of your home improvement needs - inside and out. From renovating your kitchen or refinishing your basement to installing new fences, entry doors or windows. We speccialize in site preparation. Our customized foundations provide the needed stable and secure base for your structure. They are visually more appealing than traditional cinderblocks as well as more economical than cement pads.


Auto Transport - United Freight Of America
1844 N Nob Hill Rd
4.82(
941
)
Auto Transport - United Freight Of America
1844 N Nob Hill Rd
4.82(
941
)
Customers say: Quality work
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers

United Freight of America is your all inclusive transport solution. CONTACT US FOR A QUOTE. please include pick up and Drop off locations and vehicle information

"Excellent, no problems. My car was new the first year I used the service and there has never been any damage during the transports. The men picking up and delivering the car have always been pleasant and cooperative. Both Ely and Guy at United Transport has been highly responsive to my needs. I would highly recommend this company."

CLAUDIA H on October 2021

United Freight of America is your all inclusive transport solution. CONTACT US FOR A QUOTE. please include pick up and Drop off locations and vehicle information

"Excellent, no problems. My car was new the first year I used the service and there has never been any damage during the transports. The men picking up and delivering the car have always been pleasant and cooperative. Both Ely and Guy at United Transport has been highly responsive to my needs. I would highly recommend this company."

CLAUDIA H on October 2021


Earl Foust Construction Inc.
130 Eyer Road
No reviews
Earl Foust Construction Inc.
130 Eyer Road
No reviews
34 years of experience

We are a custom builder of new homes and additions as well as home remodeling. We are in Danville Pa,

We are a custom builder of new homes and additions as well as home remodeling. We are in Danville Pa,


SCICCHITANO GENERAL CONTRACTORS
27 N OAK ST
4.60(
5
)
SCICCHITANO GENERAL CONTRACTORS
27 N OAK ST
4.60(
5
)
Customers say: Super punctual

Hardware and Home Improvement

Hardware and Home Improvement


Renewal By Andersen Corp - Mechanicsburg
4856 Carlisle Pike
4.40(
43
)
Renewal By Andersen Corp - Mechanicsburg
4856 Carlisle Pike
4.40(
43
)
Customers say: Quality work
30 years of experience

Renewal by Andersen of Central PA services all of the central Pennsylvania region including the Harrisburg, Lancaster and York regions. We encourage you stop by our show room in Mechanicsburg, PA and allow our knowledgeable associates to help you choose the right window or door solution for your home. Renewal by Andersen is an industry leader in quality windows and door solutions with over 100 years of proven craftsmanship. Additional DBAs - Ambassador Home Improvements Inc, Renewal By Andersen of Central Pennsylvania & Andersen Corp. Additional phone numbers - (717) 364-1850, (717) 234-1770, (717) 591-4900, (866) 323-0500, (717) 364-1880 & (866) 877-2200. Additional emails - ambassador@ambassador-home.com & info@rbacentralpa.com. Additional website - www.rbacentralpa.com. Call for service area details.

"Beautiful door. Salesman knew the product well. Customer service was great. Installation was a breeze and the guys cleaned up after themselves."

Candy B on September 2023

Renewal by Andersen of Central PA services all of the central Pennsylvania region including the Harrisburg, Lancaster and York regions. We encourage you stop by our show room in Mechanicsburg, PA and allow our knowledgeable associates to help you choose the right window or door solution for your home. Renewal by Andersen is an industry leader in quality windows and door solutions with over 100 years of proven craftsmanship. Additional DBAs - Ambassador Home Improvements Inc, Renewal By Andersen of Central Pennsylvania & Andersen Corp. Additional phone numbers - (717) 364-1850, (717) 234-1770, (717) 591-4900, (866) 323-0500, (717) 364-1880 & (866) 877-2200. Additional emails - ambassador@ambassador-home.com & info@rbacentralpa.com. Additional website - www.rbacentralpa.com. Call for service area details.

"Beautiful door. Salesman knew the product well. Customer service was great. Installation was a breeze and the guys cleaned up after themselves."

Candy B on September 2023

...
Showing 1-10 of 349

Addition to existing structure building services FAQs

How far you can push a room depends on the structure you choose. A cantilevered bump-out can extend 24 inches before building codes require its own footing or foundation. Anything longer needs engineered support and a permit. Check local codes or consult with a structural professional before finalizing plans to ensure your design remains safe and compliant.

Most bump-outs are completed within one to four weeks, even with minimal electrical, plumbing, or HVAC work. Their compact size means less demolition, simpler inspections, and fewer weather-related delays compared to a full-scale addition. Your contractor can provide a more precise timeline once they have determined the scope, materials, and permit schedule, but plan on having the extra square footage ready in approximately a month.

The homeowners guide to addition to existing structure building services
From average costs to expert advice, get all the answers you need to get your job done.
small bathroom that has been updated in a remodel
Apr 29, 2025
Apr 29, 2025
Budget for the cost to remodel a small bathroom based on factors such as required fixtures, bathroom size, labor, remodel type, site prep, and more.
guest house in the backyard
Apr 27, 2025
Apr 27, 2025
Need to build a guest house? Here’s how much it costs, what factors affect cost, and what to expect.
Kitchen view leading into dining area
Apr 28, 2025
Apr 28, 2025
Use this guide to budget for bump-out addition costs based on factors such as room size, room type, labor, finishes, permits, and more.
House roof with nice window
Apr 28, 2025
Apr 28, 2025
Budget for dormer addition costs based on factors such as roof type, framing, customizations, reinforcement, cladding, labor, and more.
newly installed kitchen countertops in modern kitchen
Apr 26, 2025
Apr 26, 2025
Need to replace your kitchen countertop? Here’s how much it costs, what factors affect cost, and what to expect.
house with new addition built on
Apr 25, 2025
Apr 25, 2025
Planning a home addition? Discover what to expect during the process, including design choices, permits, construction timelines, and key factors that impact your project’s success.
Share project details to get started.