Monkey Island homes, on the water or uphill
Windows, entry, patio and storm doors, and siding for Monkey Island houses and weekend places.
Window Replacement in Monkey Island, OK
New windows and doors for your lake house, put in by our own crew
T Town Windows & Doors is based in Tulsa, about 70 miles away, and owned by brothers Andrey and Vadim Napelenok. Their own crew replaces windows and doors around Grand Lake, Monkey Island included, at the houses people live in year round and the ones they come up to on weekends.
- Based in Tulsa, about 70 miles away
- Our own crew, never subcontractors
- Free estimate at your lake house
Window installers near Monkey Island
The owners who run the job, and the crew who installs it
Andrey and Vadim Napelenok own T Town Windows & Doors and have installed windows, doors and siding for 17+ years. When a job is on the lake, the brothers supervise it and work on site themselves, alongside the long-time crew that does every install, and no part of it goes to a subcontractor.
- Andrey NapelenokCEO and co-owner
- Vadim NapelenokCo-owner
- Installing windows
- 17+ years
- Miles from downtown Tulsa
- About 70
- Subcontractors on the job
- None
Homes and businesses by the lake
A Monkey Island house, or a building nearby
Apartments, offices and shops by the lake
Commercial windows and doors for buildings around Grand Lake, plus aluminum storefronts.
Replacement windows, Monkey Island
What we install for Monkey Island homeowners
Whether the house sits at the water's edge or back in the trees, we bring the samples out to it, and our own crew puts in what you choose.
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Replacement Windows
Gentek Signature Elite and ProVia Endure vinyl windows and the Andersen 100 Series, in any style you order, picture windows and casements included. Gentek builds its Signature Elite with a sash-to-sill interlock it says resists bowing in high winds, worth asking about on the side of the house that faces the lake.
- Every style, from picture windows to bays
- Ask for the PG rating on each size
- Our 1-year workmanship warranty
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Patio and Sliding Doors
Sliding patio doors from Gentek, with steel reinforcement at the interlocks and lock rails, or ProVia Endure, which drains its sill through a patented system, plus hinged French doors out to the deck.
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Entry Doors
A new front or side door for the lake house, picked with you at the opening once we have looked at the old door and its frame.
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Storm Doors
A glass or screen storm door hung in front of the entry door you keep, for the porch or the walkout facing the water.
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Siding
Vinyl siding or James Hardie fiber cement, on its own or along with new windows. Hardie lists Oklahoma in the zone for its HZ10 boards, made for heat and humidity.
Reviews from our customers
Homeowners on how the job went
- ★★★★★ 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
Window and door jobs near Monkey Island
2 real jobs across the lake
We have not had a job on Monkey Island itself yet, but these two are close by on Grand Lake: black sliding doors on a Cleora lake house and a wall of black windows facing the water at Grand Lake Towne. Each is pinned on its town on our jobs map, never on the house.
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Full project
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Full project
Monkey Island lake houses
Where does your house sit?
Where your house sits on the peninsula changes the wind it meets: two houses a short walk apart can face very different conditions. The building code sorts a lot by what the wind crosses before it gets there, and that changes what to ask about each window.
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Facing open water
A house that looks straight down the lake
Oklahoma's 2024 residential code counts a site as Exposure D when the wind comes to it over at least 5,000 feet of open water, and it carries that 600 feet inland, or 20 times the building's height if that is more. That is the code's most open exposure, and the side of the house facing that stretch of water is where a window's tested rating matters most.
- Exposure D can apply on this side
- Ask for the PG of each window size
- Ask for the patio door's own label
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On a cove
A house tucked into a cove
When the water in front of the house is a cove or a creek arm rather than the main lake, the wind may not cross the 5,000 feet of open water that Exposure D needs. The code's Exposure C covers open terrain with scattered obstructions, and each wind direction is judged on its own, so a cove house can face open water from one side only.
- Check which side faces the main lake
- Each wind direction is judged apart
- Sliders by the dock: ask about drainage
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Up in the trees
A house up the hill, in the woods
Wooded lots with closely spaced trees are the code's Exposure B, the category it assumes unless a site fits another one. About half of Delaware County's homes were built from 1970 to 1999, so a house up the hill may still have the windows and front door it was built with.
- About half the county's homes: 1970 to 1999
- First windows from that era are common
- A new front or storm door suits the walkout
Monkey Island and Delaware County
A peninsula out in the lake
What the Oklahoma Historical Society, the Census Bureau, the Oklahoma Climatological Survey and Oklahoma's building code say about Monkey Island and the county around it, and what that means for a window on the lake side of the house.
What the window's label tells you
Example label, not a real product
AAMA/WDMA/CSA 101/I.S.2/A440
Class R PG 35
Size tested: 48 x 76 in
Design pressure: +35 / -35 psf
Water test: 5.25 psf
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Performance class R
One of four classes, R, LC, CW or AW, each with its own minimum grade: 15, 25, 30 and 40.
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Performance grade (PG) 35
One rating for the structural, water and air tests passed together. Andersen puts it simply: a PG50 product takes 50 psf of wind pressure.
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Design pressure (DP) +35 / -35 psf
The wind load in pounds per square foot, tested pushing in and pulling out. A DP on its own means only the structural test.
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Size tested 48 x 76 in
The size the rating was earned at. Ask how a bigger window of the same line is rated.
The label values are an example of how one reads, not a real product's ratings. Class minimums are from the North American Fenestration Standard quick reference, the water test at 15 percent of DP for class R from FGIA, the DP and PG difference from Andersen, and the 5,000 feet from Exposure D in the 2024 Oklahoma Residential Code. Not to scale. Sources: FGIA, Performance Class Overview; FGIA, NAFS Quick Reference Guide (2014); Andersen, Design Pressure FAQs; Oklahoma Residential Code 2024, R301.2.1.4.
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Named before the lake filled
Monkey Island is a peninsula about 6 miles long on Grand Lake. Its name dates to 1938, while the lake basin was being cleared: a visitor joked to a Tulsa World reporter that the land would be Monkey Island, and the name stuck. The dam on the Grand River was finished in 1940 and the lake filled behind it. Today the peninsula holds lake homes, businesses, a private airport and, at its tip, the Shangri-La resort, whose hotel opened in 2017.
Source: TulsaPeople, Monkey-ing around (April 29, 2022); Oklahoma Historical Society, Delaware County
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Nearly 4 in 10 homes are part-time
Monkey Island has no Census figures of its own, but its addresses share the 74331 ZIP code with Afton. In that ZIP area the Census counts 2,330 of 6,139 homes as held for seasonal, recreational or occasional use, nearly 4 in 10, and about 54 percent are someone's usual home.
Source: U.S. Census Bureau, ACS 2020-2024 5-year, B25002 and B25004, ZIP 74331
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Mostly owned, mostly 1970 to 1999
Across Delaware County, which takes in Monkey Island, owners live in about 3 in 4 of the homes that are occupied, 13,224 of 17,161, and about half of all the county's homes were built from 1970 to 1999. These are county figures, not Monkey Island's own.
Source: U.S. Census Bureau, ACS 2020-2024 5-year, B25003 and B25034, Delaware County
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A south wind, most often
The Oklahoma Climatological Survey's Delaware County summary, read from the Mesonet station at Jay, puts the average wind at 6 mph and has it blowing from the south about 22 percent of the time. An average is gentle; a window is rated for the strong gusts, and on a lot with a long reach of open water the code's Exposure D applies.
Source: Oklahoma Climatological Survey and Oklahoma Mesonet, Delaware County Climate Summary
Patio door replacement Monkey Island
Six questions about a window's wind rating
Ask these about any window or patio door going into a lakefront wall, whoever installs it. Each one comes from Oklahoma's 2024 residential code, the window industry's standard as FGIA explains it, or a maker's own documents.
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How much open water does the wind cross before it reaches this wall?
The code's Exposure D applies where wind comes over at least 5,000 feet of open water, and for 600 feet inland or 20 times the building's height. It is judged for each wind direction, so one side of a house can be D and another not.
Check first: Look at the lake from each side of the house on a map, and ask whoever designs or inspects the work which exposure they use.
Oklahoma Residential Code 2024, R301.2.1.4
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Is there a label showing what the window was tested to?
The code requires exterior windows and sliding doors to be tested by an approved independent lab and to carry a label naming the maker, the performance characteristics and the inspection agency, under AAMA/WDMA/CSA 101/I.S.2/A440.
Check first: Ask to see the label or the maker's rating sheet for the exact line and size before you order.
Oklahoma Residential Code 2024, R609.3
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Is the number a performance grade or only a design pressure?
Andersen explains that a DP rating now describes a product tested only for structural loading. A PG means it also passed the air, water, operating force and forced entry tests.
Check first: Ask which one the number on your quote is, PG or DP.
Andersen, Performance Grade and Air Infiltration
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Was it tested at a size as big as my window?
The label's main line gives the class, the grade and the size tested, and a rating goes with the size it was earned at. Big lake-view windows are where this matters.
Our answer: Our main window, Gentek Signature Elite: its brochure says larger windows, or windows that must meet a specific DP/PG rating, need the optional weeps/performance package.
FGIA, NAFS Quick Reference Guide; Gentek Signature Elite brochure (2024)
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How much water pressure did it hold back in the test?
Wind off the lake drives rain sideways. FGIA sets the water test at 15 percent of the design pressure for classes R, LC and CW, and 20 percent for AW, with at least 2.90 psf for class R.
Check first: Ask for the water test pressure, one of the secondary numbers on the label.
FGIA, Performance Class Overview
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Does the patio door have a rating of its own?
The code names sliding doors alongside windows for testing and labeling. A side-hinged exterior door, French doors included, is labeled to the same standard or to ANSI/WMA 100.
Check first: Ask for the label of the whole door unit, frame and panels, at the size you are buying.
Oklahoma Residential Code 2024, R609.3
Entry door replacement Monkey Island
Entry, sliding and French doors for the lake side
What to know about each outside door of a Monkey Island house before it takes the wind off the water.
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Entry doors
Oklahoma's 2024 residential code has a side-hinged exterior door tested and labeled either to the North American window and door standard or to ANSI/WMA 100. On a front or side door that faces the lake, ask which one the door you choose carries, and its rating.
Entry doors -
Sliding patio doors
This black slider is one of ours, on a lake house in Cleora, a few miles from Monkey Island. Gentek builds its sliding doors with steel reinforcement at the interlocks and lock rails, and ProVia's Endure sliders drain the sill through a patented system.
Patio and sliding doors -
Hinged French doors
We install hinged French doors as well as sliders. A pair that swings out to the deck is rated as a whole unit, so ask for its rating at the width and height you need, since a rating goes with the size it was tested at.
French patio doors
Sources: Oklahoma Residential Code 2024, R609.3; FGIA, NAFS Quick Reference Guide; Gentek Signature Elite brochure (2024); ProVia Endure Windows & Patio Doors brochure (2026).
Monkey Island window questions
Lake houses, wind ratings and the drive up
Do you replace windows and doors on Monkey Island?
Yes, T Town Windows & Doors replaces windows and doors on Monkey Island and pretty much anywhere around Grand Lake, at full-time homes and at weekend and vacation houses. We are based in Tulsa and have no office at the lake; our own crew drives up for each job, with Andrey and Vadim supervising and working on site.
How far is Monkey Island from Tulsa?
Monkey Island is about 70 miles from downtown Tulsa in a straight line, a peninsula about 6 miles long on Grand Lake, in Delaware County. Its addresses use the 74331 ZIP code it shares with Afton, and it sits inside the 100 miles from Tulsa that T Town Windows & Doors covers.
What does PG mean on a window label?
PG stands for performance grade, one rating in pounds per square foot for a window that passed the structural, water and air tests of the North American window standard together. Andersen gives the example that a PG50 product takes 50 psf of wind pressure. The grade sits on the label's main line with the performance class and the size tested.
What is the difference between DP and PG?
The difference between DP and PG is what was tested. DP, design pressure, now describes a window or door tested only for structural loading, Andersen explains, while PG, performance grade, means it also passed the air infiltration, water penetration, operating force and forced entry tests. Both are written in pounds per square foot, so ask which one a quote is giving you.
Does a lakefront house need windows with a higher rating?
A lakefront house can face higher wind loads, because Oklahoma's 2024 residential code treats a site with 5,000 feet or more of open water upwind as Exposure D, its most open category. The code sets the design wind loads windows must resist from its wind tables adjusted for height and exposure, so ask the person designing or inspecting the work what your walls call for.
Where do I find the rating on a new window?
The rating is on the window's label: the code requires windows and sliding doors to carry one naming the maker, the performance characteristics and the inspection agency. The NAFS quick reference notes that the performance label can be temporary, so read it, or ask for the maker's rating sheet, before it comes off.
How many homes near Monkey Island are second homes?
Nearly 4 in 10 homes in the 74331 ZIP area, which Monkey Island shares with Afton, are held for seasonal, recreational or occasional use: 2,330 of 6,139 in the Census Bureau's 2020 to 2024 survey. Across all of Delaware County, about half of the homes were built from 1970 to 1999.
Have you done jobs near Monkey Island?
Yes, nearby on Grand Lake, though not yet on Monkey Island itself: black sliding patio doors on a lake house in Cleora, and a wall of black windows facing the water at Grand Lake Towne. Both are on our jobs map, pinned on their towns rather than the houses.
How did Monkey Island get its name?
Monkey Island got its name in 1938, while the Grand Lake basin was being cleared, TulsaPeople reports: a visitor joked to a Tulsa World reporter that the land would be Monkey Island, and the name stuck once it ran in the paper. The dam was finished in 1940, the Oklahoma Historical Society records, and the lake filled behind it.
Sources (14)
- TulsaPeople, Monkey-ing around: Grand Lake's Monkey Island is home to many amenities (Kelly Bostian, April 29, 2022)
- Oklahoma Historical Society, Encyclopedia of Oklahoma History and Culture, Delaware County
- Shangri-La Resort, Monkey Island, OK 74331 (the resort's own address)
- U.S. Census Bureau, ACS 2020-2024 5-year, B25002 Occupancy Status and B25004 Vacancy Status, Delaware County and ZIP 74331
- U.S. Census Bureau, ACS 2020-2024 5-year, B25003 Tenure, B25034 Year Structure Built and B25035 Median Year Structure Built, Delaware County and ZIP 74331
- Census Reporter, Delaware County, OK profile (ACS 2024 5-year)
- Census Reporter, ZIP 74331 profile (ACS 2024 5-year)
- Oklahoma Climatological Survey and Oklahoma Mesonet, Delaware County Climate Summary
- Oklahoma Residential Code 2024 (IRC 2024), Chapter 3, R301.2.1.4 Exposure Category
- Oklahoma Residential Code 2024 (IRC 2024), Chapter 6, R609 Exterior Windows and Doors
- FGIA, Performance Class Overview
- FGIA, NAFS Quick Reference Guide, AAMA/WDMA/CSA 101/I.S.2/A440-08 (FEN-BC, February 2014)
- Andersen, Design Pressure FAQs
- Andersen, Performance Grade and Air Infiltration for Andersen Products
From call to install at the lake
Four steps to a finished lake house
- Free estimates on Monkey Island
- Samples and brochures brought to you
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Tell us where the house is
Call (918) 619-2010 or send the form with the address and the windows or doors you want to replace, and say whether you are at the house full time or on weekends.
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We drive up with samples
There is no showroom to visit, so the samples and makers' brochures come up to the lake with us, and we walk each opening with you.
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Options that fit each opening
We explain what each window and door needs and which options fit it, so nothing goes on the quote that 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 helping on site.
Get a Monkey Island estimate
Tell us about the lake house
Call (918) 619-2010 or send the address and what you want replaced, and we set a day to come up and go through 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 
