FAQ: How To Build A House On A Steep Slope?

Is building on a slope more expensive?

Your costs will be more than a home on a flat lot. The excavation can be six times more expensive depending on many factors such as grade, rock, and access. The foundation will require much more concrete and cost up to three times more.

How steep of a slope can you build on?

The ideal slope for in-ground building is a slope of 5 to 7 feet through the width of the house, or 15% to 20%. Building on steeper slopes often presents challenges, and this type of construction is carefully regulated by local jurisdictions that vary, as do local soil types.

What is considered a steep slope?

Steep slopes are legally defined as hillsides having a 15 foot, or greater, vertical rise over 100 feet of horizontal run, or 15% slope (Figure 1).

What is a house built into a hill called?

The in- hill (also termed “earth covered”, or “elevational”) construction is where the earth shelter is set into a slope or hillside, and earth covers the roof in addition to the walls.

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Is it bad to buy a house on a slope?

Potential disadvantages of owing a home on a steep slope. Resale value / sale-ability: because many buyers will perceive homes on steep slopes as a risky investment, it may be harder to sell the home plus potentially the home could appreciate more slowly than comparable flatter terrain homes.

How do you dig footers on a slope?

DIY: Footings on a Sloped Grade

  1. Select your location.
  2. Drive stakes where you want your footing sections or pilings to go.
  3. Dig the holes.
  4. Insert reinforcing bar into the hole.
  5. Level the surface of the footings and attach what fastener you need for your project.

What is the least expensive style house to build?

Generally defined as houses with square footage between 100 and 400 square feet, tiny houses are typically the cheapest kinds of houses to build. That said, fitting your everyday needs into a tiny space often takes some custom work, so there may still be some costs to the custom cabinetry and custom fixtures required.

What is a gentle slope?

adjective. A gentle slope or curve is not steep or severe.

How steep is a 30% slope?


Slope (%) Approximate degrees Terminology
15 – 30 8.5 – 16.5 Strong slope
30 – 45 16.5 – 24 Very strong slope
45 – 70 24 – 35 Extreme slope
70 – 100 35 – 45 Steep slope

Is a 5% grade steep?

5 ft vertical rise for 100 ft. is a 5 % grade. Often used in cycling for mountains & hills. Keep in mind that grade is generally an average over the entire run. There are probably portions which are steeper and some more shallow.

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How steep is a 15 slope?

Table of Common Slopes in Architecture

Degrees Gradient Percent
7.13° 1: 8 12.5%
10° 1: 5.67 17.6%
14.04° 1: 4 25%
15 ° 1: 3.73 26.8%


Is it cheaper to build an underground house?

It is estimated that underground homes generally cost 20-30% more than the cost of constructing conventional houses. Although caves and dugouts are the most common structure when it comes to underground living, there are some underground living spaces that look and feel just like a regular luxurious house!

Can you build a house into a hillside?

There are two ways to build a house on a sloped lot: using the “cut and fill” method, or making use of stilts. Soil may be brought in to “fill” the plot and make it level, or it can be dug (“cut”) from the slope and either trucked out or used to shore up retaining walls for the home.

Is it expensive to build underground?

It is more expensive to build underground than to build above ground. When building underground you must be able to withstand the earth pressure forces and seal the structure from ground water intrusion. Above ground you only need to withstand wind forces and snow loads.

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