Asked by: Joussef Lorenzon
home and garden smart home

How much is it to extend your house?

Last Updated: 3rd May, 2020

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Single-storey extensions
Single story extensions can cost anywhere between $1,350 per m2 to $2,100 per m2. This cost depends largely on the type of materials you use and the design you choose. According to Domain, the cost of adding an 80-square-metre ground-floor extension ranges from $164,526 to $310,896.

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Furthermore, how can I extend my house cheaply?

Cut the cost of an extension: 25 ideas to cut costs and extend

  1. Do your sums then cut the cost of an extension.
  2. Cut the cost of an extension with a simple design.
  3. Plan ahead in detail to extend a house cheaply.
  4. Stick to the agreed design to reduce the cost of an extension.
  5. Go off-the-shelf not made-to-order to extend cheaply.

Additionally, how much can you extend a house without planning permission? The permitted development rules have recently been relaxed, allowing you to build an extension without planning permission of up to six metres (or eight metres if your house is detached).

Also asked, is it worth adding an extension?

In most cases, adding an extension will increase the value of a property. However, that isn't the only consideration you should make. If you are planning on selling your property in the near future, the cost of creating an extension must be less than the value you'll gain from doing so.

How much would a single story extension cost?

The cost of a single storey extension will depend on the scale of your project and where abouts you live in the country. A basic extension will typically cost you around £1,000 per square metre, meaning a 3 x 5 metre single storey extension, for example, would set you back £15,000.

Related Question Answers

Nusrat Kram

Professional

How long does an extension take?

How long does it take to build an extension? For a relatively simple, three metre, single rear extension, construction time should be around three to four months. For a larger or double height rear extension it may be more like six months.

Karan Gorostiaga

Professional

Do I need an architect for extension?

You plan on extending or converting
Starting out, it's important to note that there's no law requiring you to get an architect. You could just go straight to a builder. In fact, some people do allow their contractor to both design and build their project. However, this can be a risky approach.

Shenna Donado

Explainer

Is it cheaper to add on or build up?

According to HomeAdvisor, the average cost for building additions is between $80 to $200 per square foot without regard to whether it is up or out. While it is usually cheaper to build up than out, that's just the actual construction expense. Costs also vary depending on exactly what the contractor must do.

Anatael Grefkes

Explainer

How do you extend a small house?

Small house extension ideas: 14 ways to max out your space
  1. Create space by adding a porch.
  2. Add a box dormer to create more full-height space.
  3. Add a living room extension.
  4. Connect your home to a converted garage with a covered walkway.
  5. Transform a dark basement with a lightwell.
  6. Add a bay window extension.
  7. Fill in with a side return extension.

Jason Antoniazzi

Explainer

How much does a 500 sq ft addition cost?

The average house addition costs between $86 and $208 per square foot with most homeowners spending $128 per sqft. Adding a 20x20 family room costs $48,000 on average, while adding a 12x12 bedroom costs about $17,300. Adding a bathroom starts at $18,000.

Sahila Burack

Pundit

How much does it cost to extend roof?

$5-$8 per square foot | Removing the roof structure. $14.00-$21.50 per square foot | Cost of extending gable walls. $16.00-$22.00 | Building the new roof structure.

Dorethea Sencion

Pundit

Is it better to extend or move house?

There is no set answer to whether it is better to move house or extend on your current property, as it will depend on individual situations. Extending may seem like the easier option, but will still be disruptive to your family's living and may not be as cost effective in certain regions.

Harald Dwelck

Pundit

What adds the most value to a house?

Some home improvement projects that add value to a home include:
  1. Remodeling the Kitchen.
  2. Bathroom Addition.
  3. Reinventing a Room.
  4. Adding Energy-Efficient Windows.
  5. Deck Addition.
  6. Energy-Efficient Insulation.
  7. Basic Updates.

Sun Gewirtz

Pundit

Is it worth extending a semi detached house?

Extending to the side or rear of a semi-detached home can be a great means of adding floorspace, and making the most of the garden too — after all, many existing homes fail to take full advantage of the views or access to the patio and garden.

Fernand Liso

Pundit

Will a single storey extension add value?

Extension. Adding square footage is pretty much guaranteed to boost value, whether it's adding a kitchen or dining area with a single-storey extension, which usually doesn't require planning permission, or a double extension for extra bedrooms.

Chahd Afkir

Teacher

How much does it cost to build a first floor extension?

Material cost
For example, a single floor extension with timber will cost around $1,500 to $2,100 per m2 while one with vinyl will cost around $1,350 per m2.

Sarahi Curras

Teacher

How can I add value to my house?

50 Clever Ways to Instantly Add Value to Your Home
  1. Add some smart technology.
  2. Have your trees trimmed.
  3. Remove your carpeting.
  4. Resurface your cabinets.
  5. Build a deck.
  6. Add an irrigation system.
  7. Change the upper or cabinetry colors in your kitchen.
  8. Add some attic insulation.

Yeniffer Drouet

Teacher

How much value does a 4th bedroom add?

Cathy Morrissey, known as The Reno Chick, says while a combination of factors ultimately determine the value of a property, adding a bedroom to a house valued between $500,000 and $1 million generally adds $50,000 to $80,000. It can cost between $50,000 and $100,000 to add one though, she adds.

Cleto Jeon

Teacher

Can a Neighbour stop my extension?

A terraced house and semi-detached house can be extended up to 6 metres and a detached house up to 8 metres from the original house. However, your neighbours do have the right to object to this. They have a 21 day period in which they can give valid reasons as to why they believe the extension should not be built.

Remigio Quagli

Reviewer

Can I extend my house at the front?

Front extensions are normally NOT allowed, except where the dwelling does not front a highway or is a substantial distance from the highway. Our annexe is behind a house, is 40 metres from the highway and can not be seen from the highway. The majority of houses in our area are approx. 10 metres from the highway.

Anahid Incremona

Reviewer

What to do if you want to build an extension?

How to build an extension on your home in 19 easy steps
  1. Consider these questions before you go ahead.
  2. Ask advice from an extension veteran.
  3. Work out the costs.
  4. Consider how you will finance your extension.
  5. Work out the outgoings at each stage of the project.
  6. Take advantage of reduced VAT for empty properties.
  7. Work out if you need planning permission.

Razia Sequeiro

Reviewer

Do I need council approval to extend my house?

Extensions. An addition or extension to your house* is generally considered to be permitted development. So you won't need to go through the additional hassle of getting planning permission as long as: Extensions of more than one storey do not extend beyond the rear wall of the original house by more than three metres.

Kristoffer Weinel

Reviewer

What are the stages of building an extension?

There are always exceptions to the rules; however, in general, majority of house extension building projects follow a similar process:
  • Site Establishment.
  • Demolition/Groundworks/Drainage.
  • Build structure/Roofing/External Finishes.
  • Internal Renovation and Remodelling.
  • Services, Internal Fitout and Finishes.

Salimu Verpeto(A)

Supporter

Can I build a wooden extension?

In principle YES you should be able to put a timber frame extension on top of your brick & block kitchen extension. In fact this is probably the best choice for your build because it will be relatively lightweight and be more easily carried by the ground floor and the foundations.