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Top-Rated Addition to existing structure builders in Downingtown - Updated Nov 2026

Avatar for All-Phase Construction Company, LLC.
All-Phase Construction Company, LLC.
4.8(
177
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

Super Service Award Winner

In business since 1988

Free estimates

Emergency services offered

"Absolutely amazing team always on time. I hired Allphase construction for a big project and Second story addition and they did an astonishing job from the beginning to the end in a manner time! Joe the owner is a great guy to work with, Josh the project manager is a very easy communicator, good listener and attentive to the details I call him Golden Jxxx I recommend them to anyone! Thank you so much Allphase Construction Team for making me and my little family more living space!!! Definitely I will use them egain for future needs."
Bay View Window addition
Staircase transformation
Bay View Window
Window Installment
Outdoor Deck addition

+43

Response time2 days
Response rate86%
2 neighbors recently requested a quote
Avatar for Nelson General Contractor LLC
Nelson General Contractor LLC
5.0(
13
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

In business since 2017

Free estimates

Warranties offered

"Fantastically well. The quality of the work performed was top notch and the individuals on the team were highly professional and very personable. The lead, Samuel Nelson, listened carefully to everything that I said and then provided valuable feedback that resulted in a better outcome and lower overall cost. I am more than pleased to be able to recommend Nelson General Contractor."
Remodeling - General Project
Remodeling - General Project
Remodeling - General Project
Had to build a more beefed structural wall.
Handymen Project

+21

2 neighbors recently requested a quote
Recommended by53%of homeowners
Avatar for MNB Renovations
MNB Renovations
5.0(
10
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

"It was a wonderful experience. Matt knew what he was doing. He listened to what we wanted and made sure we got what we wanted. He had suggested we visit a Cabinet maker store in Lancaster and after doing that we found the perfect cabinets for us. His work is excellent. He is very efficient and neat. Even with our changes he was able to maintain and keep the project on schedule. On a personal level he and his helper were very nice. I would highly recommend Matt to anyone and we are having him come back to do other projects."
Kitchen Remodel
New stair case and great room
Oak staircase
Kitchen Remodel
Entry way

+181

Response time5 days
Response rate100%
3 neighbors recently requested a quote
Avatar for Inspired Exteriors, LLC
Inspired Exteriors, LLC
5.0(
32
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

Free estimates

Credit card accepted

Customers say: True professional

"Kevin from Inspiring Exteriors was excellent to work with on this project. He was very responsive and accommodating. Cost of project was competitive compared to other estimates we received. The work was completed as promised and looks great! Yard clean up was also excellent. Would definitely hire again in the future."
Complete Exterior Makeover with Herringbone Siding & Stone Accents
GAF Timberline HD Pewter Gray, Added Ridge Vent
Owens Corning Duration Onyx Black
Owens Corning Duration Pewter Gray
Roofing, Siding, and Gutters

+279

Response time1 day
5 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Longacre Handyman Improvements
Longacre Handyman Improvements
4.8(
16
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"We (my husband and I) hired Nick from Long Acre handyman to do a couple of handyman jobs this year. One was cleaning our dryer vent. He did a great job. Then we asked him to repair a few boards on our wooden deck. He did a great job with that as well. He is professional and reliable, and does good thorough work. We are pleased customers. We will continue to hire him for handyman jobs as needed and would recommend him."
framing walls
deck painting
flower bed
framing walls
deck painting

+109

Response time10 hrs
Recommended by100%of homeowners
Avatar for Legacy Construction Company LLC
Legacy Construction Company LLC
4.4(
56
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

In business since 1990

Free estimates

Warranties offered

"I had a tree fall on my house back in June 2020 which caused major damage to the back of my home. I called several contractor's but I wasn't pleased with their assessment. I then came across Legacy Construction and they were great from the start. I spoke to Mrs. Diane on the phone and she was great, she gathered a lot of information from me and told me that I was in good hands and informed me that Gary the project manager will be contacting me shortly. After speaking to Gary he explained to me the first thing that needed to be done is the property needed to be tarped asap because the home is being exposed to water which is causing further damage and causing mold to building up because water has been coming into the property for almost two months. Gary informed me step by step room by room what damages the tree caused and how he was going to fix the water damages and the damages done to the frame of the home. After speaking to Gary I was sold and stopped looking for a contractor to fix my house. I would definitely recommend Legacy Construction to anybody that needs work done to their home. Their customer service and workmanship is great I would highly recommend."
Electrical Project
Roofing Project
Roofing Project
Electrical Project
Roofing Project

+262

Response time9 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for Prosperity Construction Group LLC
Prosperity Construction Group LLC
5.0(
6
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

In business since 2023

Free estimates

Warranties offered

"Started working with Vince & the PCG team this year and it has been nothing short of excellent. The communication, reliability, and honest work makes PCG a pleasure to work with. The work speaks for itself from interior to exterior. Highly recommend, and looking forward to working on more projects together in the near future"
Mainline Kitchen Remodel
Mainline Kitchen Remodel
Mainline Kitchen Remodel
Mainline Kitchen Remodel
Mainline Kitchen Remodel

+81

4 neighbors recently requested a quote
Avatar for D. Willis General Contractors, Inc.
D. Willis General Contractors, Inc.
4.5(
23
)
Addition to Existing Structure - Build

Serving Downingtown, PA and surrounding areas

Approved

In business since 1984

Free estimates

Small jobs welcome

"Perry, was easy to work with, he stayed on top of everything. He went over and above what most contractors do. The trust and confidence his crew gave me was outstanding and very reassuring. I had to leave my property for the duration of the project but the crew kept me well informed of the progress. I would highly recommend D. Willis General Contractors, Inc. for any project."
Response time1 day
29 neighbors recently requested a quote
Recommended by29%of homeowners
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FAQs for addition to existing structure building service projects in Downingtown, PA

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The Downingtown, PA 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.