I would use the "Something's Gotta Give" movie house as your example,

https://hookedonhouses.net/2018/03/01/somethings-gotta-give-hamptons-beach-house/

Lots of dark wood, but mixed with painted wood pieces, light fabrics (including rugs), pale blues and greens, and beach-y elements like shells and clear glass hurricane lamps.

I always thought it was interesting that a company stepped in to make the rugs, but it looks as if after all these years they're going to stop selling them so they're having a final closeout,

https://www.aspencarpetdesigns.com/product/beachhouse_6x9-htm/

Thanks so much! And awesome link to the "Gotta Give" house...love it! I'm visual so that is huge help and inspiration! What do you think about rug? Bring in one with blue tones? What is rule of thumb with rug...more neutral to coordinate with my sofa?

I would definitely bring in more blue tones, which to me says what you described in your original post, "casual, chic beach style". I'd avoid adding too much more beige or grey, neither of which really seems beachy to me.

You are so close, not hard at all to get what you want. I agree on the previous poster about sisal rug, they add the coastal vibe anywhere. There are some places (Pottery Barn used to) that will custom make them in whatever size and color border you want. I would use that pretty turquoise on the wall to find and use in throw pillows instead of black and find a light print with the same color to recover the dining chairs.

Your couch seems light enough, but a lighter rug with a costal themed patter (will look for one for visual) but have you thought about using some chalk paint on your dining set to lightening it easily and cheaper and you can sand and wax it to give it that beachy look with light color (like a light linen color)?

And some light pillows in whites and light blues, maybe some corals if you want it to be with the current trend color.

and lots of textures on those pillows and rugs

I wouldn't paint any of the existing dark wood furniture, but I don't know if I'd any more of that to the mix. I think the focus now should be adding textiles to soften the look and add some color and pattern. Ballard also has some nice rugs.

Consider redoing your dining chair cushions in a new beachy or floral print.

When you said you had heavy dark furniture, I was expecting something Tuscan or Victorian. You're more than halfway to a beachy look now. Your sofa is perfect. A new coffee table, a sisal rug, some beachy pillows...you've got this.

And your dogs in the pictures are adorable!

I see this color on your shelves - 8 x 10 for 200 [might have shell pink]

Rye Teal Persian-Style Area Rug, 8'x10' · More Info

GDF Studio Carlyle Fabric Storage Ottoman, Dark Blue Fabric · More Info

[https://www.houzz.com/products/rye-teal-persian-style-area-rug-8x10-prvw-vr~127039052[(https://www.houzz.com/products/rye-teal-persian-style-area-rug-8x10-prvw-vr~127039052)

Both come in round -- Pale blue walls - [denim in the first]

Hand Braided Twined Jute and Denim Area Rug, Blue, 8' Round · More Info

NuLoom Norbul Vintage Corene 8' Round Blue Rug · More Info

GDF Studio Carlyle Fabric Storage Ottoman, Dark Teal Fabric · More Info

[https://www.houzz.com/products/hand-braided-twined-jute-and-denim-area-rug-blue-8-round-prvw-vr~86732839[(https://www.houzz.com/products/hand-braided-twined-jute-and-denim-area-rug-blue-8-round-prvw-vr~86732839)

If you like a bright aqua / turquoise alot, could keep rug, and chalk paint coffee table. If you usually like tabletop items: large wicker bowl, that type...

and searching around for colorful lamp, for unique items...

Houzz has 'a sale' on round especially - if you like use of black - bring out the stool also / maybe if you want much texture throughout rooms. Great reviews:

Jute Round Tribal Circle Black Print, 8' Round · More Info

Cerreto Mercury Glass Table Lamp By Designer Billy Moon · More Info

Abstract Seascape Landscape Original Acrylic Modern Painting on Canvas 36x48 · More Info

[https://www.houzz.com/products/cerreto-mercury-glass-table-lamp-by-designer-billy-moon-prvw-vr~100848788[(https://www.houzz.com/products/cerreto-mercury-glass-table-lamp-by-designer-billy-moon-prvw-vr~100848788)

[https://www.houzz.com/products/jute-round-tribal-circle-black-print-8-round-prvw-vr~114926852?lid=86284087[(https://www.houzz.com/products/jute-round-tribal-circle-black-print-8-round-prvw-vr~114926852?lid=86284087)

Displayed with hot yellow vase - 200 good reviews also in green:

Machine Made Jizah Rug, Blue, 8'x10' · More Info

Chic - what degree of dressy? - this but not so much with cotton dhurrie.

Next one, better....?

Handcrafted Metal Mosaic Blue Table Lamp · More Info

Havasu Azure Blue Glass Table Lamp · More Info

You could do wicker, rattan, or painted wood. But I'd go for something with cleaner lines if you choose painted wood.

Something like this,

or this (maybe a square or rectangular version -- without seeing a plan of the room, it's hard to tell from the photo what would work),

I'd take a look at Wisteria too, for furniture, rugs, and accessories,

https://www.wisteria.com

Also, would you consider two matching ceramic garden stools under the sofa table?

Good reviews and square costs less.

Bali Breeze Low Square Accent Table, Silver Patina · More Info

[https://www.houzz.com/magazine/so-your-style-is-coastal-stsetivw-vs~1394923[(https://www.houzz.com/magazine/so-your-style-is-coastal-stsetivw-vs~1394923)

"Darker woods have a place in this style, but they're generally the exception rather than the rule. A walnut chest can look stunning against a room full of light colors, as long as the deeper tones don't overtake the space."

It doesn't seem that a small DR overtakes what's in your main seating....?

--------------

"Soft blue calls to mind the ocean and sky....Does this mean you can’t have brights? No. A mix of persimmon, turquoise and lime might seem more Caribbean, do that if you don’t mind sacrificing the SERENE feel.... Another strategy: Bring in varying shades of a single color, such as coral.....Or add hints of classic nautical hues — navy and white, for example, looks as fresh as a sailor’s just-pressed uniform. The key is to stay consistent; too many color schemes in different rooms add up to too many personalities for a single house."

"Organic materials such as sea grass, straw and jute bring a natural warmth and texture. A few touches of rope: nautical balls, lamps — add lighthearted appeal ...Something different: Break up organic surfaces with contrast. A wicker coffee table next to a rattan chaise on top of a sisal rug might be a bit much. This dining area juxtaposes a sleek table with woven, cushioned armchairs to streamline the space."

Nice chair. Would changing it depend whether current rug, or if there's new rug? As to sectional/tables, idk how you'll get much beachy without changing something...? Unless at eye level you'll be adding curtains or beachy... art?? Btw, I like your soft blue walls, and to me it'd add to the look with large item of a rug - chair at least used that color.

Grover's etc. idea for jute and texture -- this seems it -- but they're showcasing chandelier, fp/art.... so to me, chic room needs that, or color.

Dennis Bayview Cape · More Info

Soft blue walls and blue coffee table....

hill and harbour · More Info

$40

Cassie 26.5" Quilted Ceramic Table Lamp, Natural Drum Shade, Spa Blue · More Info

[https://www.houzz.com/photos/hill-and-harbour-beach-style-living-room-providence-phvw-vp~14271153[(https://www.houzz.com/photos/hill-and-harbour-beach-style-living-room-providence-phvw-vp~14271153)

Some inspiration pics from "Something's Gotta Give",

Coffee table and rug from Wisteria:

Imo, cause tv's are so dark I wouldn't have contrast of white in that spot... what about painting it sunset coral?

The oatmeal sectional is perfect IMO, go for the blue rug and add coral as accents. Your current wood pieces are fine, don't change them.

I'm not reading others comments. I would say instead of thinking "beach" (which can be limiting and makes people think of only blue), think "Caribbean". Dark wood furniture and white linen and palm trees.

lisalija, I assume this question--"...how do you put in new rug, coffee table, etc in place of existing??"--is directed at me. I use Photoshop.

The dark chair you posted yesterday can work as it is, I think. The cushions look like they're covered in a light leafy fabric already. Put it on the left side of the TV console and give it a beachy side table of its own.

Legend of Asia Famille Porcelain Stool | Perigold · More Info

Safavieh Janika End Table & Reviews | Wayfair · More Info

Jules Small Accent Table in Accent Tables | Crate and Barrel · More Info

I agree about painting the backs of your bookcase a light blue. I saw it done recently in the beach house on Grace and Frankie. You have a lovely home.

I would go a shade or two deeper than the wall color for more depth for the backs of the bookcases.

Gotta post flatweave cause much is ivory.... [blue too whoo]