Energy bills across Columbia, SC are climbing in 2026, and for many homeowners it feels like the utility company flipped a switch overnight. Between new rate requests, rising fuel costs, and older homes that leak conditioned air, monthly power bills are getting squeezed from both sides. The good news is that this is exactly where working with a remodeling contractor in Columbia SC can turn a painful bill into a long-term upgrade for comfort, resale value, and efficiency.

Why 2026 power bills feel higher in Columbia, SC

There are a few big forces pushing energy costs up for Midlands homeowners this year:

  • Utility rate increases. Dominion Energy has filed for a residential rate increase that would raise the average South Carolina homeowner’s electric bill by about 12.7% if approved, citing grid investments and rising demand. (rate request summary) (Dominion rate review) Fuel cost adjustments that took effect in 2025 have already inched average bills upward. (fuel rider changes)
  • “Famously hot” summers and more usage. Columbia routinely sees some of the highest summer highs in the state, with dozens of days at 90°F+ each year. (climate overview) When you combine that heat with rate hikes, every small inefficiency in your house shows up in the bill.
  • Aging homes built before modern energy codes. A large share of Columbia’s housing stock was built before 1980. National research shows that about 89% of U.S. single-family homes are under-insulated, with older homes most likely to have poor insulation or gaps in the thermal envelope. (NAIMA report) That means more of the energy you pay for simply leaks out through walls, floors, and attics.
  • Heating and cooling are most of your energy use. According to the U.S. Department of Energy, heating and cooling typically account for 50–70% of the energy used in the average American home. (DOE insulation guide) So any inefficiency in the building envelope shows up directly on your power bill.

Rates are part of the story, but not the whole story. The other half is how well your house holds onto conditioned air. That’s where South Carolina’s energy codes—and when your home was built—start to matter.

How South Carolina energy codes work for insulation

South Carolina doesn’t let each city make up its own energy rules. Instead, the state follows a statewide South Carolina Energy Standard based on versions of the International Energy Conservation Code (IECC).

A quick timeline:

  • 2006 IECC adopted. South Carolina first adopted the 2006 IECC as its minimum statewide energy standard, implemented in 2008 for new construction. (state code summary)
  • 2009 IECC update. In 2012, the General Assembly updated the state’s energy standard to the 2009 IECC (Act 143), with an effective date of roughly January 1, 2013 for residential buildings. (DSIRE summary) (EnergyCodes.gov)
  • Structural codes keep moving; the energy code lags. South Carolina has since adopted newer structural codes (like the 2018 and now 2021 IRC and IBC), but the energy code itself still references the 2009 IECC with state-specific amendments. (code cycle overview) (state R-value summary)

For Columbia’s climate zone (Zone 3), that 2009-based standard expects:

  • Significantly more attic insulation than you see in many 1960s–1970s homes (think a deep blanket of insulation, not just a thin layer of rock wool or fiberglass).
  • Insulated wall cavities and better window performance than single-pane aluminum frames.
  • Insulated and sealed floors over crawlspaces so air-conditioned or heated air isn’t bleeding into vented, damp space under the house.

Even though the code is not the newest IECC version, it still sets a much higher bar than what existed when many of Columbia’s older neighborhoods were built. And that gap is a big reason why your 2026 power bill looks very different from the one in a newer subdivision built under modern standards.

What this means for Columbia’s 1950–1980 homes

Most of the classic Columbia neighborhoods—Shandon, Forest Acres, Rosewood, parts of downtown, and older areas of Lexington and West Columbia—were built before South Carolina had any dedicated energy conservation code on the books. Builders focused on structure and layout; insulation was often minimal or omitted entirely in wall cavities and floors.

National housing data backs up what contractors see in the field. Harvard’s Joint Center for Housing Studies notes that as of 2015, a significant share of homes built before 1980 still had “poor” insulation, and only a small fraction had ever had a professional energy audit or retrofit. (JCHS analysis) Combined with NAIMA’s finding that 89% of U.S. homes are under-insulated, it’s reasonable to assume many mid-century homes in Columbia are far from current standards. (NAIMA report)

In practice, when we open up walls and ceilings in older Columbia homes, we frequently see:

  • Empty wall cavities behind plaster or drywall—even on exterior walls.
  • Minimal attic insulation (a few inches at best) with lots of gaps around can lights, chases, and ceiling penetrations.
  • Uninsulated floors over vented crawlspaces, so conditioned air falls through the cracks and cold, damp air rises into the home.
  • Single-pane windows and leaky doors that let conditioned air escape and humid air in.

Your older home may have had blown-in attic insulation added in the 1990s or 2000s, but if the walls, floors, and air sealing were never addressed, you’re still paying 2026 power rates to heat and cool a 1960s shell.

If you want a deeper look at how older framing, moisture, and crawlspace issues show up during renovations, Remodeling Older Homes in Columbia: Hidden Issues to Watch For walks through exactly what we uncover when we open up mid-century homes.

Common insulation and code gaps in mid-century Columbia homes

Here are some of the most common building-science issues we see in homes built between roughly 1950 and 1980 in Columbia:

  • Uninsulated or poorly insulated exterior walls. Many homes from this era used 2×4 framing with either no insulation or a thin batt that has since slumped. That leaves long vertical channels where air can move freely, robbing you of comfort.
  • Attics with patchwork insulation. Older loose-fill insulation often settles or gets pushed aside during wiring or HVAC work. Any spot where you can see the ceiling drywall or top of the joists is a major energy leak.
  • Leaky, unconditioned crawlspaces. Vented crawlspaces with bare subfloor and uninsulated ductwork are a huge source of energy loss and moisture problems. Warm air rises, so cold crawlspace air constantly gets pulled into the home through gaps in the floor and interior walls.
  • Outdated windows and doors. Single-pane glass and poorly weatherstripped doors leak air and allow radiant heat to pour in during summer afternoons.
  • Disconnected system upgrades. Sometimes the HVAC system has been replaced, but the ducts, insulation, and air sealing were never addressed. That means a high-efficiency unit is still fighting against an inefficient shell.

Because heating and cooling can represent 50–70% of a home’s total energy use, tightening up the envelope with the right insulation and air sealing has a direct, measurable impact on your power bill. (DOE insulation guide)

How an energy-focused remodel closes the gap

Energy efficiency upgrades are rarely just one product. They’re usually a sequence of smart moves that fit into a broader renovation plan. That’s where working with a remodeling contractor in Columbia SC—who understands both building codes and older homes—really matters.

During a kitchen, bathroom, or whole-home renovation, you already have walls and ceilings open. That’s the perfect time to:

  • Upgrade wall insulation. Dense-pack cellulose, spray foam, or high-density batts can be added to wall cavities once old plaster or drywall is removed. This dramatically reduces drafts and temperature swings room-to-room.
  • Add proper attic insulation and air sealing. Before topping off attic levels, we seal can lights, chases, top plates, and penetrations. Then we bring the total insulation depth in line with modern energy-code expectations for our climate zone.
  • Correct crawlspace problems. Crawlspace encapsulation, sealed vents, and either insulated floors or insulated foundation walls drastically improve comfort in older homes. Our article on crawlspace repair in Columbia SC goes deeper into how this ties into structural and moisture issues.
  • Right-size and re-design mechanical systems. Once the envelope improves, mechanical loads change. In many major renovations, we’re also updating HVAC, ductwork, and ventilation to match the tighter shell. For more on that, see Mechanical Upgrades in Major Home Renovations South Carolina.
  • Upgrade windows and doors strategically. We can phase window upgrades by elevation or room, focusing first on the worst performers or sun-baked sides of the home.

Because all of this work is already being coordinated for your remodel, the added labor to insulate properly and meet current South Carolina energy standards is much more efficient than trying to do it piecemeal later.

When does an insulation upgrade make financial sense?

Not every home needs a full gut remodel to see benefits. But there are some clear signs that energy-focused renovations are worth serious consideration:

  • Your energy bills feel out of proportion to your home’s size, especially after recent rate increases.
  • Certain rooms are always too hot in summer or too cold in winter.
  • Floors over the crawlspace feel cold, and you notice musty odors or visible condensation.
  • You’re already planning a kitchen, bathroom, or whole-home renovation and will have walls and ceilings open.

In our article Whole-Home Renovation vs Moving in Columbia SC, we talk about setting financial guardrails so you don’t over-invest relative to neighborhood values. Energy upgrades fit into that same conversation: they should improve your comfort and long-term operating costs, without pushing your total investment beyond what the market can support.

How Chonko Construction approaches energy efficiency in remodels

As a remodeling contractor in Columbia SC, our job is not just to make homes look better—it’s to make them perform better in a hot, humid climate with rising energy costs. On remodel and renovation projects, we typically:

  • Evaluate the existing envelope (attic, walls, crawlspace) and mechanical systems before finalizing design.
  • Coordinate insulation and air-sealing upgrades with structural work, drywall, and finish schedules.
  • Ensure new work aligns with South Carolina’s energy standard and local inspection requirements.
  • Plan mechanical upgrades so HVAC, ductwork, and ventilation match your home’s new loads, not its 1960s assumptions.

Energy bills in 2026 are moving in only one direction. But how much of that bill you actually have to pay, month after month, depends heavily on how well your home holds onto the conditioned air you’re buying.

If you’re living in an older Columbia home and you’re already thinking about a remodel, it’s the perfect time to talk about insulation, air sealing, and mechanical upgrades at the same time as layout and finishes.

Ready to explore an energy-smart remodel? Visit our Remodeling & Renovations page to learn more about our process, or reach out to start a conversation about upgrading your home for both comfort and energy efficiency.