New Docks on Lake Sinclair: Size Limits, Frontage & Boathouses
A new dock on Lake Sinclair is sized by Georgia Power's rules, not by how much water you have in front of the house. Docks top out at 320 square feet, reach no more than 50 feet out, and need a minimum amount of shoreline that depends on when your lot was platted. This page covers the frontage and size limits, placement, the boathouse rules, boat size and swim buoys, and what a new dock costs.
Before the dock: frontage, one structure, and a house for anything more
Two rules decide whether a dock is possible at all. First, "GPC only allows one shoreline structure per lot (e.g., a dock, boathouse, boat slip or combination thereof)." Second, the lot needs enough shoreline:
- Lots platted before 2000: at least 50 feet of straight-line shoreline, pin to pin. Georgia Power's Lake Sinclair dock section also asks for at least 50 feet of width at the Georgia Power project boundary.
- Lots platted, surveyed or re-surveyed after 2000: at least 100 feet of straight-line shoreline, pin to pin, for any shoreline structure other than a seawall, and 100 feet of width at the project boundary.
A third rule matters if you want more than a dock. Georgia Power requires a residential structure on lease lots and privately owned lots before it approves "any shoreline structures other than a dock and/or seawall." So that rule doesn't stop a dock on a vacant lot, but it does stop a boathouse: the boathouse section says a residential structure must be on the lot "for a boathouse to be permitted."
Your plat or survey is the place to check the frontage numbers. If you're close to a cutoff, ask the Land Management Specialist for your county before paying for a design.
How big, how far out, and where
Georgia Power's dock limits for Lake Sinclair
- Size
- "Maximum dock dimensions will not exceed 16'x20' or 320 Square feet, when permitted by GPC." Georgia Power's Lake Sinclair dock section adds that dimensional variations, such as 10 by 32 feet, may apply in some cases
- Reach
- No more than 50 feet from the shoreline
- In a cove
- No more than one-third of the way across
- Setback
- At least 15 feet from the projected property line, both at the shoreline and out in the water
- Walkway
- The primary offshore walkway at least 4 feet and no more than 6 feet wide
- Layout
- The flag dock is Georgia Power's standard configuration for new docks
Georgia Power's shoreline page also encourages placing docks in the center third of the lot, "for possible future combination enhancement." On a narrow lot, the 15-foot setbacks on each side can decide the dock's position before anything else does.
What can't go on a new dock
- Plumbing, other than water spigots.
- Metal or aluminum carport covers used as dock shelters.
- Flood lights and underwater lights. Elevated lights should be shielded to shine down, not out.
Boathouses
A boathouse counts as your one shoreline structure and has its own set of limits in Georgia Power's guideline:
Georgia Power's boathouse rules
- Frontage
- 75 feet of straight-line shoreline (pin to pin) for lots platted before 2000; 100 feet for lots platted, surveyed or re-surveyed after 2000
- Double stall
- Lots with 100 feet of shoreline or more may qualify. Up to two full-size slips under the roofline, with at least one left open
- Single stall
- 14 feet wide by 32 feet long, outside roof post to outside roof post
- House on the lot
- A residential structure must be present, whatever the ownership type
- Side setbacks
- At least 15 feet, as Georgia Power determines
- Roof
- Pitch from 3/12 to 5/12, hip or gable; posts no taller than 9 feet
- Storage
- A storage room no larger than 5 by 12 feet under the roofline
- Not allowed
- New rooftop sundecks, enclosed sides on new boathouses, living space, and hard gas lines from the shore
Boat size and swim buoys
Georgia Power's FAQ sets a maximum vessel length of 30 feet 6 inches on Lake Oconee, Lake Sinclair and the lakes run by its North Georgia office, so plan a slip or boathouse around a boat inside that limit.
If you want swim buoys off the new dock, the guideline allows them from Memorial Day through Labor Day only, no more than 50 feet from shore or no farther out than your existing shoreline structure, two per residential lot, and never in the way of normal boat traffic.
Permits for a new dock
A new dock needs a Georgia Power construction permit, which is free. Apply online or by mail or fax to the East Georgia (Oconee/Sinclair) Resources Office in Eatonton, 706-484-7500, by appointment. Ask your county building and zoning office whether a county permit applies to the dock as well. The permits guide covers the steps and the county contacts.
What a new dock costs
No dated Lake Sinclair dock prices have been published. HomeAdvisor's 2025 national guide gives an average of $14,907, a normal range of $4,059 to $25,879, and $15 to $40 per square foot for most docks. At that per-square-foot range, Georgia Power's 320-square-foot maximum works out to $4,800 to $12,800 for the dock itself, before the walkway. HomeAdvisor lists a boathouse as an add-on at $10,000 to $50,000 or more, and a boat lift at $1,000 to $15,000. A local figure for Lake Sinclair: [PRICE]. The cost guide has more.
New dock questions
How big can a dock be on Lake Sinclair?
Georgia Power's maximum is 16 by 20 feet, or 320 square feet, reaching no more than 50 feet from shore and no more than a third of the way across a cove.
How much shoreline do I need for a dock?
At least 50 feet of straight-line shoreline for lots platted before 2000, and 100 feet for lots platted or re-surveyed after 2000.
Can I have a dock and a boathouse?
Georgia Power allows one shoreline structure per lot, which can be a dock, boathouse, boat slip or a combination of them. Ask the Land Management office how your plan would be counted.
Can a new boathouse have walls?
No. Georgia Power says new boathouses must be open-sided, and new rooftop sundecks are prohibited.
Can I build a dock on a vacant lot?
Possibly. Georgia Power's house-on-the-lot requirement covers shoreline structures "other than a dock and/or seawall," so it doesn't rule out a dock by itself. A boathouse is different and needs a residential structure on the lot. The frontage, one-structure and size rules still apply, so ask the Land Management office before you plan around it.
How this site helps
Phone (478) 551-3311 or send the form with your lot's frontage and what you have in mind. A single independent contractor who takes Lake Sinclair jobs will follow up, and you pay nothing for the introduction.
Related pages
Planning a new dock?
Phone us or use the form to reach a single independent contractor who takes Lake Sinclair jobs. There's no charge for the introduction.