--- title: What's the Cost of a Home Addition In Washington DC description: Building a home addition in Washington DC may seem more expensive than buying a new home because the 'per square foot' valuation method is deeply flawed. Here is why that is so. image: https://www.gilday.com/hubfs/Imported_Blog_Media/1-elevation-1024x767.jpg --- [![Gilday](https://www.gilday.com/hubfs/theme2021/images/gilday-logo-white.png) ](https://www.gilday.com/) [ 301.565.4600 ](tel:301.565.4600) - [About Us](https://www.gilday.com/about-gilday-renovations) - [About](https://www.gilday.com/about-gilday-renovations) - [Architects & Designers](https://www.gilday.com/architects-designers) - [Administration](https://www.gilday.com/administration) - [Production & Construction](https://www.gilday.com/production-team) - [Careers](https://www.gilday.com/careers) - [Awards](https://www.gilday.com/awards) - [What Our Clients Say](https://www.gilday.com/gilday-renovation-reviews) - [Press](https://www.gilday.com/press) - Service Area - [Arlington VA](https://www.gilday.com/home-remodeling-arlington-va) - [Alexandria VA](https://www.gilday.com/home-remodeling-alexandria-va) - [Bethesda MD](https://www.gilday.com/home-remodeling-bethesda-md) - [Chevy Chase MD](https://www.gilday.com/home-remodeling-chevy-chase-md) - [Cleveland Park DC](https://www.gilday.com/home-remodeling-cleveland-park-dc) - [Kensington MD](https://www.gilday.com/home-remodeling-kensington-md) - [McLean VA](https://www.gilday.com/home-remodeling-mclean-va) - [Potomac MD](https://www.gilday.com/home-remodeling-potomac-md) - [Rockville MD](https://www.gilday.com/home-remodeling-rockville-md) - [Washington DC](https://www.gilday.com/home-remodeling-washington-dc) - [Portfolio](https://www.gilday.com/portfolio) - [Additions](https://www.gilday.com/portfolio#additions) - [Kitchens](https://www.gilday.com/portfolio#kitchens) - [Baths](https://www.gilday.com/portfolio#baths) - [Whole House Renovations](https://www.gilday.com/portfolio#wholehouse) - Services - [Home Remodeling the Design Build Way](https://www.gilday.com/home-remodeling-the-design-build-way) - [Renovation Architect Services](https://www.gilday.com/renovation-architect-services-gilday-renovations) - [Whole-Home Remodeling](https://www.gilday.com/whole-home-remodeling-gilday-renovations) - [Kitchen Remodeling](https://www.gilday.com/kitchen-remodeling-gilday-renovations) - [Bathroom Remodeling](https://www.gilday.com/bathroom-remodeling-gilday-renovations) - [Home Additions](https://www.gilday.com/home-additions-gilday-renovations) - [Pricing & Budgeting](https://www.gilday.com/how-to-budget-for-a-home-renovation-project) - [For Realtors - Pre-Purchase Evaluation](https://www.gilday.com/for-realtors-pre-purchase-evaluation) - [Resources](https://www.gilday.com/renovation-resource-center) - [Renovation Articles](https://www.gilday.com/design-build-dc-blog) - [Contact Us](https://www.gilday.com/contact) x Search the site # What's the Cost of a Home Addition In Washington DC [Kevin Gilday](https://www.gilday.com/design-build-dc-blog/author/kevin-gilday) ![What's the Cost of a Home Addition In Washington DC](https://www.gilday.com/hubfs/Imported_Blog_Media/1-elevation-1024x767.jpg) ## Cost Per Square Foot: Home Addition vs New Home Sometimes a prospective client will ask "what's the cost per square foot for building a home addition."  Our standard answer is: We'll find out after we've built it--when we divide the finished square footage by the total tab.  I'm not being a smart aleck.  Honestly.  How could we know the cost of something we haven't even designed yet?   ![architect's rendering of home remodeling plan](https://www.gilday.com/hs-fs/hubfs/Imported_Blog_Media/1-elevation-1024x767.jpg?width=1200&name=1-elevation-1024x767.jpg)   The architect's rendering shows stylish accents meant to bring the front elevation up to design standard with the new additions planned for the side and rear of this DC colonial   [![Schedule Your Home Renovation Discovery Session With The Gilday Renovations  Experts](https://no-cache.hubspot.com/cta/default/4060073/e8836502-172b-4538-8501-e46b77033677.png)](https://cta-redirect.hubspot.com/cta/redirect/4060073/e8836502-172b-4538-8501-e46b77033677)   This is a fundamental difference between custom home renovation and new home building.  In renovation we are typically adding less than 1,000 square feet of new space--even when the program calls for a two story addition. Whereas, the square footage sweet spot for a new infill home is around 3600 square feet. ## It's Basic Math Custom renovation *appears* to be much more expensive (per square foot) than the new home.  Why?  because in a new build, the cost of the most expensive rooms in the house (kitchens and baths) gets spread over double or triple the square footage. Most [Washington DC home additions](https://www.gilday.com/home-remodeling-washington-dc#home-addition-washington-dc) must be built to fit on fairly small lots. Most home additions involve less than 1,000 square feet of new space.  So there is no place to hide cost of the big ticket features.  It's really about scale.  Producing many square feet of product gives the appearance of low (per square foot) unit cost.  Custom renovation, particularly additions (for master suite, modern kitchen and family room) pack a lot of quality into a small area adding tremendous value into the home. So, trying to put a value based on size (cost per square foot) is a deeply flawed basis for comparison. ## Think "Value" Per Square Foot for Home Additions Consider this.  "Custom" costs more than "off the shelf."  By way of example, here is a first floor layout for a two story addition we designed for a [Washington DC home remodel ](https://www.gilday.com/home-remodeling-washington-dc)residence.   ![plans for two-story home addition include master suite, kitchen, family room](https://www.gilday.com/hs-fs/hubfs/Imported_Blog_Media/room-addition-dc-1st-fl.jpg?width=1200&name=room-addition-dc-1st-fl.jpg "family room addition washington dc")   An addition doubles the size of this house providing an opportunity to reconfigure the entire first floor plan. The value of the new rooms is extremely high.   This design plan was conceived to enhance the unique characteristics of the existing house and to free it of its former limitations.  Everything about it is custom. Compare the size of the old kitchen (left) with the new design (right).  Also, you can see that we expanded the dining room (right) when we eliminated the old kitchen.  The old living room (left) was reconfigured to create a foyer and den (parlor).   ![architect's sketch of DC Home Addition](https://www.gilday.com/hs-fs/hubfs/Imported_Blog_Media/2-elevation-1024x722.jpg?width=1200&name=2-elevation-1024x722.jpg "DC Home Addition side elevation")   This side elevation shows new additions appropriately styled to resonate with the character of the original home.   There are many small changes and reconstructions to note, but it should be clear to you now that the process (and cost) of [**home additions**](https://www.gilday.com/home-addition-portfolio) and renovation is nothing like new home building.  We pack a lot of thought, care and value into a comparatively small space. To learn more about renovating a home, download the free eBook: "[The Essential Elements of Renovating an Older Home](https://www.gilday.com/the-essential-elements-of-renovating-an-older-home)."  [![Essential Elements of Renovating an Older Home](https://no-cache.hubspot.com/cta/default/4060073/2468a592-9497-4250-a7d7-f1268a50b821.png)](https://cta-redirect.hubspot.com/cta/redirect/4060073/2468a592-9497-4250-a7d7-f1268a50b821) ## Related Articles: Older Home Renovation [![11 Home Remodeling Design Tips to Guide Your 2026 Renovation Planning](https://www.gilday.com/hubfs/Images/case-studies/nandivada-primary-bathroom/primary-suite-remodel-case-study-featured-image.jpeg) **11 Home Remodeling Design Tips to Guide Your 2026 Renovation Planning** ](https://www.gilday.com/design-build-dc-blog/11-home-remodeling-design-tips-for-2026) [![A Cleveland Park Home Reimagined in Three Acts](https://www.gilday.com/hubfs/blog-images/02%20Porch_seating_10-4-23_585_.jpg) **A Cleveland Park Home 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](https://www.gilday.com/design-build-dc-blog/interior-renovation-and-reconfigure.html) [![A Sweet Master Suite Addition](https://www.gilday.com/hubfs/Imported_Blog_Media/room-additions-dc-2nd-fl.jpg) **A Sweet Master Suite Addition** ](https://www.gilday.com/design-build-dc-blog/a-sweet-master-suite-addition.html) ## Leave a comment We are architects We are interior designers We are builders Let us be yours Gilday Renovations 8820 Brookville Road, Silver Spring, MD 20910 © Gilday Renovations 2025 - [About Us](https://www.gilday.com/about-gilday-renovations) - [Portfolio](https://www.gilday.com/portfolio) - Services - [Resources](https://www.gilday.com/renovation-resource-center) - [Renovation Articles](https://www.gilday.com/design-build-dc-blog) - [Contact Us](https://www.gilday.com/contact) 301.565.4600 [info@gilday.com](mailto:info@gilday.com) [Privacy Policy](https://www.gilday.com/gilday-com-privacy-policy) ```json { "@context" : "https://schema.org", "@id" : 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