Grand Lake homes, on the shore or in town
Windows, entry, patio and storm doors, and siding for lake houses and homes in the lake towns.
Window Replacement in Grand Lake, OK
Replacement windows and doors for lake homes, installed by our own crew
Brothers Andrey and Vadim Napelenok run T Town Windows & Doors from Tulsa, and their own crew drives out to Grand Lake for window and door jobs pretty much anywhere around the shore, from a weekend place on a cove to a year-round home in Grove, Jay or Ketchum.
- Real jobs on Grand Lake
- Own crew, no subcontractors
- EPA lead-safe certified renovators
Window replacement company Grove, OK
The two owners, and the crew they bring to the lake
T Town Windows & Doors is Andrey and Vadim Napelenok's company, and the brothers have put in windows, doors and siding for 17+ years. When a job is at Grand Lake, they come out from Tulsa with their own long-time crew, supervise it and work on site, and no part of the install goes to a subcontractor.
- Andrey NapelenokCEO and co-owner
- Vadim NapelenokCo-owner
- In the window trade
- 17+ years
- Miles from Tulsa to the lake towns
- 55 to 75
- Subcontractors on the job
- None
Homes and businesses at Grand Lake
A lake house, a home in town or a building
Apartments, offices and shops near the lake
Commercial windows and doors for buildings around Grand Lake, plus aluminum storefronts.
Replacement windows Grove, OK
What we install for Grand Lake homeowners
Whether the house sits on a cove, up a wooded lot or on a street in Grove, we bring the samples to it and our own crew does the installing.
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Replacement Windows
Gentek Signature Elite and ProVia Endure vinyl windows and the Andersen 100 Series, in every style: picture units, casements, awnings, sliders, double-hungs, bays, bows and special shapes, from the wall that faces the water to a bedroom on the road side.
- Fixed and opening units for a whole wall of glass
- Black frames offered by Gentek and ProVia
- Our 1-year workmanship warranty
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Entry Doors
A new front or side entry door of the type you choose, picked with you at the house after we look over the old one and its frame.
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Patio and Sliding Doors
Gentek and ProVia sliding patio doors in two, three or four panels, and hinged French doors, for the deck, the porch or the walk-out to the water.
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Storm Doors
A storm door hung in front of the entry door you keep, with glass or a screen, for the side of a lake house you come and go through.
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Siding
Vinyl siding or James Hardie fiber cement, as its own job or done with the windows. James Hardie's warranty puts Oklahoma in the zone for its HZ10 boards.
What customers say
Reviews from the homeowners we work for
- ★★★★★ Replacement windows
We had an outstanding experience with Andrey, Vadim, and the entire installation team. They were professional, highly skilled, and took obvious pride in their work from start to finish. The crew arrived on time, worked efficiently, paid close attention to detail, and treated our home with care. The quality of the installation exceeded our expectations, and they made sure everything was cleaned up before they left. It’s refreshing to work with craftsmen who are knowledgeable, courteous, and committed to doing the job right. I would highly recommend Andrey, Vadim, and their team to anyone looking for top-quality window installation.
Keith N.Google review · Renewal by Andersen job - ★★★★★
Vadim & Andrey were terrific! Professional and thoughtful, took time before they got started to answer our questions and again at the end to make sure we were happy and knew how to work and care for our awesome new windows. They took the time to hear my concern about how two different windows may be ‘set back’ differently compared to the brick facade, talked to me about how they would adjust for it and executed perfectly. They do great work, things look very well finished and these guys caulk lines are second to NONE!! Thanks guys, will be recommending we get you for phase 2!
Mike B.Google review · Renewal by Andersen job - ★★★★★
We got our windows installed today by renewal by Anderson‘s. Our installers were.Vadim and Andrey. They were kind, informative of what they were doing and very professional. They cleaned up everything. The windows are beautiful. We were so impressed. I wished I did this a long time ago. Thank you so much!
Shawn Y.Google review · Renewal by Andersen job - ★★★★★
Wanted to say thank you to Vadim and Andrey and their team for the great work on my new windows and door. Was told it take all day and they were finished in about 5 hours. They went over instructions on how to open and close and take the screens out, cleaned up and took all the old windows and door. I’m very impressed with their work and the windows are amazing! Once again thank you guys for the hard work and timely service!
Landy P.Google review · Renewal by Andersen job - ★★★★★ Replacement windows
Installation day I did not know what to expect. Vadim's and Andre's crew showed up shortly after 8 am. The entire 5-man crew worked diligently through the heat and high winds. They were all polite and answered any questions I had. They covered my furniture and put down carpet to protect my belongings. I was amazed at the speed and efficiency of the crew; they worked as a team and installed all 19 windows in one day. The crew vacuumed the carpet and cleaned up their work area. My previous windows were so foggy I had forgotten what a beautiful view I have of my backyard. My windows no longer sing when the wind blows and they make it much quieter. Thank you for a job well-done.
Vicki A.Google review · Renewal by Andersen job - ★★★★★ Replacement windows
Vadim and his team did a fabulous job. They exceeded my expectations. Windows are beautiful, functional and have transformed the look of my home.
Tom M.Google review · Renewal by Andersen job - ★★★★★ Replacement windows
These window installers surpass professionalism. They were prompt curtious and friendly professional. Above all they worked quietly and very efficient. Vadim and Tim were two very unique individuals. I will recommend their service to everyone. Thank you gentlemen my house is already much cooler
Danton V.Google review · Renewal by Andersen job
Patio door replacement Grand Lake
2 real jobs on Grand Lake
Black sliding doors set into the stone of a lake house in Cleora, and a long run of black windows facing the water in Grand Lake Towne. Both are on our jobs map, pinned on the town, never on the house.
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Full project
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Full project
Grand Lake houses, cove to town
Which of these is your place?
Your place is most likely one of three kinds of Grand Lake homes: a weekend place that sits closed for weeks, a 1970s or 80s house, or a newer home built to face the water. Each one starts the window conversation in a different spot.
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Weekend or seasonal place
A lake house you visit or rent out
The Census Bureau counts 4,983 of Delaware County's 24,396 homes as held for seasonal, recreational or occasional use, about 1 in 5, and around Grove it is closer to 1 in 4. If you are only at the house some weekends, say so when you call and ask how the walkthrough and the install day can be set around the days you are there.
- About 1 in 4 homes around Grove are seasonal
- Ask how the visit fits the weekends you are there
- A storm door adds glass or a screen at the entry
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1970s or 80s home
A house built from 1970 to 1989
More Delaware County homes date from 1970 to 1989 than from any other span, about 36% of them, and the county's median home was built in 1987. A house that age may still have its original windows, or a first set of replacements that is getting old. If any of it was built before 1978, ask about lead-safe work first: Andrey and Vadim are EPA lead-safe certified renovators.
- 8,793 county homes date from 1970 to 1989
- Median year built in the county: 1987
- Ask whether each opening keeps its size
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Built since 2000
A newer house facing the water
About 28% of Delaware County's homes went up in 2000 or later. Houses built to face the lake tend to put most of their glass on that side, in tall windows and sliding doors to a deck, so that wall is where the choices about fixed and opening panes and door panels add up.
- 6,874 county homes built in 2000 or later
- Sliding doors in two, three or four panels
- Picture units and vents in one wall
Grand Lake and Delaware County
A lake made by a dam, ringed by small towns
What the Grand River Dam Authority, the Oklahoma Historical Society, the Census Bureau and the City of Grove say about the lake and the homes around it, and how a wall of lake-view windows is put together.
The wall, seen from inside
Two ways to join units, seen from above
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Transoms
Fixed units set above the rest of the wall. They can be rectangles or one of the special shapes in both brochures, such as a circle top or an eyebrow, and Gentek pairs its picture windows with those shapes.
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Picture unit
Glass that does not open, so it gives the widest view of the water. ProVia's Endure picture window holds its glass directly in the frame, with no sash around it.
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Casement vents
Hinged at the side, cranked open outward. Gentek's hinge lets you clean the sash from inside, and its brochure suggests pairing casements with fixed lites for a bigger view.
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Awning vent
Hinged at the top, it opens up and out, so it can sit under a picture unit and bring in air. Gentek's awning locks at two points.
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Mull joints
Where separate units are joined. Gentek also builds casements and awnings with several lites in one frame, and ProVia covers a mullion with a mull cap, so ask which joints on your wall are which.
How a wall of windows is put together, using the parts the makers name in their brochures; not a drawing of a T Town job and not to scale. The U.S. Department of Energy adds that windows closing against a gasket, like casements and awnings, typically leak less air than sliding ones. Sources: Gentek, Signature Elite brochure (2024); ProVia, Endure Windows & Patio Doors brochure (2026); U.S. Department of Energy, Retrofit Best Practices homeowner guide.
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A lake the dam made in 1940
The Grand River Dam Authority built Pensacola Dam between December 30, 1938, and March 21, 1940. It runs a mile across the Grand River valley, and GRDA counts the lake behind it at 46,500 surface acres. The Oklahoma Historical Society notes that the lake sprawls north across Delaware County into Ottawa County.
Source: Grand River Dam Authority, About GRDA and Pensacola Dam
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About 1 in 5 homes is a seasonal place
Of Delaware County's 24,396 homes, the Census Bureau estimates 4,983 are held for seasonal, recreational or occasional use. In the Grove area, the Census division around the town, it is 3,657 of 14,726, about 1 in 4, while inside Grove's city limits it is about 1 in 10.
Source: Census Reporter, Delaware County, OK (ACS 2020-2024, B25004)
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Most homes are from 1970 to 2009
Delaware County's median home was built in 1987. About 36% of its homes date from 1970 to 1989, and about 28% from 2000 or later, while about 19% are older than 1970. About 3 in 4 occupied homes in the county are lived in by their owners.
Source: Census Reporter, Delaware County, OK (ACS 2020-2024, B25034, B25035, B25003)
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Grove, the county seat and the hub
Grove was the only incorporated town in the county at statehood, so it became the seat of government, the Oklahoma Historical Society records. Today the city has about 3,900 homes with a median year built of 1991, and about 1 in 3 of its occupied homes is rented.
Source: Oklahoma Historical Society, Delaware County; Census Reporter, Grove, OK
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Same size, same operation
The City of Grove lists replacing existing doors and windows of the same size and operation among the jobs that need no building permit, while an alteration or remodel does need one. Turning a fixed pane into one that opens, or making an opening larger, is a question for the Building Inspector at (918) 786-6107.
Source: City of Grove, Frequently Asked Questions, Building Permits
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A lakeshore town of 79 people
Our window wall job is in Grand Lake Towne, a small residential town on the shore whose voters chose to incorporate in October 1961, six votes to none. The 2020 census counted 79 residents. The Oklahoma Historical Society credits the lake's recreation and privacy with drawing people to build homes there.
Source: Oklahoma Historical Society, Encyclopedia of Oklahoma History and Culture, Grand Lake Towne
Window walls for lake houses
What to ask before you replace a wall of glass
Ask these about any wall of windows facing Grand Lake, whoever quotes it. Each one comes from the window makers' own brochures, the U.S. Department of Energy or the City of Grove.
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Which panes need to open, and which can stay fixed?
A fixed picture unit gives the most glass and the widest view, but it never opens. Gentek's brochure suggests combining casements or awnings with fixed lites to bring in air.
Check first: Stand at the wall and note which panes you open now and which you never touch.
Gentek Signature Elite brochure
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Should the vents be casements or sliders?
The U.S. Department of Energy notes that windows that compress a gasket, rather than a sliding seal, typically let less air leak in and out, and it suggests considering casements or awnings even where the old windows slide.
Check first: Ask to see how each vent sample closes and seals before you pick.
U.S. Department of Energy, Retrofit Best Practices
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Is each group one frame, or separate units mulled together?
Gentek offers casement and awning windows with several lites in a single frame, while ProVia shows mulled picture windows joined at a mullion with a mull cap over the joint.
Check first: Ask which joints on your quote are inside one frame and which are mull joints, and how each one is covered outside.
Gentek Signature Elite and ProVia Endure brochures
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Will any opening change size, or a fixed pane become a vent?
Grove's permit rules exempt replacing doors and windows of the same size and operation; an alteration or remodel needs a building permit.
Check first: In Grove, call the Building Inspector at (918) 786-6107. Outside the city, ask the town or county the house is in.
City of Grove
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Can I get black frames to match the house?
Gentek's Portfolio exterior colors include black, and ProVia makes all-black Endure windows and patio doors in a textured matte coal black paint.
Check first: Look at the black sample in daylight beside your stone or siding.
Gentek and ProVia brochures
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Who comes out, and who does the install?
A window wall is a lot of glass to hand to someone you have not met, and at a lake house you may not be there every day of the job.
Our answer: We walk the house with you and bring the samples, since we have no showroom. Our own crew installs, with Andrey and Vadim supervising and working on site, and no subcontractors.
Storm door installation Grove, OK
Entry, patio and storm doors for the lake side and the road side
The doors of a Grand Lake house, from the entry guests see first to the sliders that open onto the water.
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Entry doors
Sidelights and a glass transom around a front door, like the stone entry in this photo, bring daylight into a hall on the road side of the house. The door, its glass and its frame are chosen with you at the house.
Entry doors -
Patio and sliding doors
This black slider opens a Cleora lake house onto the water. Gentek's sliding patio doors come in two, three or four panels and in its Portfolio exterior colors, black among them, and ProVia's Endure sliders come in two, three or four panels as well.
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Storm doors
A full-glass storm door in front of the entry door you keep lets light into the entry, and one with a screen lets air through when you open up the house after time away.
Storm doors
Sources: Gentek Signature Elite brochure (2024); ProVia Endure Windows & Patio Doors brochure (2026).
Grand Lake window and door questions
Lake towns, Grove permits and window walls
How far is Grand Lake from Tulsa?
The towns around Grand Lake sit about 55 to 75 miles northeast of downtown Tulsa in a straight line: Langley about 56 miles, Disney and Ketchum about 58, Grand Lake Towne 59, Cleora 65, Afton and Bernice 68, Jay 69 and Grove 73. T Town Windows & Doors is based in Tulsa and has no office at the lake; our own crew comes out for each job.
Do you work all the way around Grand Lake?
Yes, we take window and door jobs pretty much anywhere around Grand Lake, from Grove and Jay to Ketchum, Langley and Afton. We have already put black sliding patio doors into a lake house in Cleora and a wall of lake-view windows into a house in Grand Lake Towne. Call (918) 619-2010 with the address.
Do I need a permit to replace windows in Grove?
Not for a like-for-like swap: the City of Grove lists replacing existing doors and windows of the same size and operation among the jobs exempt from a building permit. An alteration or remodel does need one, so if an opening gets bigger or a fixed pane becomes one that opens, call the Building Inspector at (918) 786-6107. Outside Grove, ask the town or county the house is in.
How big is Grand Lake?
Grand Lake O' the Cherokees covers 46,500 surface acres, according to the Grand River Dam Authority, which built Pensacola Dam across the Grand River valley between 1938 and 1940. GRDA calls it the world's longest continuous multiple arch dam. The lake reaches north across Delaware County into Ottawa County.
How many homes around Grand Lake are second homes?
About 1 in 5 homes in Delaware County is held for seasonal, recreational or occasional use: 4,983 of 24,396 in the Census Bureau's 2020 to 2024 estimates. Around Grove the share is about 1 in 4, while inside Grove's city limits it is about 1 in 10. These are survey estimates with a margin of error.
What is a mulled window?
A mulled window is two or more separate window units joined side by side or stacked, with a mullion between them. ProVia's brochure shows mulled picture windows and a mull cap that covers the joint outside. Not every divided window is mulled: Gentek builds casement and awning windows with several lites in a single frame.
Should the windows facing the lake open or stay fixed?
Which panes open is your choice. A fixed picture unit gives the widest view but never opens, and Gentek suggests pairing fixed lites with casements or awnings for air. The Department of Energy notes that windows closing against a gasket typically leak less air than sliding ones. At the walkthrough we lay out the options, so you pay only for what the wall needs.
Can I get black windows and patio doors?
Yes, you can get black windows and patio doors. Gentek's Portfolio exterior colors include black for its windows and sliding patio doors, and ProVia makes all-black Endure windows and patio doors in a textured matte coal black paint. Both of our Grand Lake jobs, the Cleora sliders and the Grand Lake Towne window wall, have black frames.
Who installs the windows at a Grand Lake house?
At a Grand Lake house, as everywhere we work, our own crew does the install and no subcontractor touches it. Brothers Andrey and Vadim Napelenok own the company, supervise each job and work on site. Both hold Renewal by Andersen Certified Master Installer certificates and EPA lead-safe renovator certificates, which matter on a house built before 1978.
Sources (10)
- Grand River Dam Authority, About GRDA (46,500 surface acres; Pensacola Dam completed 1940)
- Grand River Dam Authority, Pensacola Dam (built December 30, 1938, to March 21, 1940)
- Oklahoma Historical Society, Encyclopedia of Oklahoma History and Culture, Delaware County
- Oklahoma Historical Society, Encyclopedia of Oklahoma History and Culture, Grand Lake Towne
- Census Reporter, Delaware County, OK: ACS 2020-2024 5-year, B25002, B25003, B25004, B25034 and B25035
- Census Reporter, Grove CCD, Delaware County, OK: ACS 2020-2024 5-year, B25004
- Census Reporter, Grove, OK: ACS 2020-2024 5-year, B25003, B25004 and B25035
- City of Grove, Frequently Asked Questions, Building Permits
- U.S. Department of Energy, Retrofit Best Practices homeowner guide (windows)
- U.S. EPA, Lead Renovation, Repair and Painting Program
From call to install at Grand Lake
Four steps from your first call to the last pane
- Estimates at your house on the lake or in town
- Samples and brochures brought to you
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Tell us where the house is
Call (918) 619-2010 or use the form with the town or cove, and which windows or doors you want to change.
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We come out to the lake
We have no showroom, so the samples and brochures make the drive with us, and we go through each window and door with you.
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Options laid out plainly
We tell you what each opening needs and which options fit it, so you do not pay for glass or hardware the house does not need.
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Our own crew installs
Our long-time crew does the installing, with Andrey and Vadim supervising and working alongside them on site.
Get a Grand Lake estimate
Tell us where on the lake you are
Call (918) 619-2010 or send the address and what you want replaced, and we set a time to walk the house with you.
- You reach outCall (918) 619-2010 or send this form. We call you back within 24 hours.
- We walk your house with youWe bring samples and brochures and look at every window and door together.
- You choose what is rightWe explain the options, so you never pay for more than your house needs.
- 17+years installing in Tulsa
- 1-yearworkmanship warranty
- LifetimeGentek glass breakage warranty
Talk to Andrey or Vadim(918) 619-2010 
