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InsightHorizon Digest

How long does a single storey extension take

Author

Joseph Russell

Updated on April 12, 2026

For a single storey extension, it will normally take around 3 months for the work to be completed. The first step in the process is for the site to be prepared.

How long does it take to do an extension?

For a small relatively simple three metre, single rear extension, construction time is usually around three to four month. For larger double height rear extensions, it may be around five to seven months.

How much does a single story extension cost?

Single storey – A single storey extension in London will usually cost between £2,000 and £3,000 per sqm (£185 and £280 per square foot). £2,000 per sqm would represent cost-effective finishes and products.

How much does a single storey extension cost UK?

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

How long does it take to build an extension UK?

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.

How long does a single story house take to build?

Standard single story, slab construction will take anywhere from 4-6 months, and double story, high end custom homes will generally have an estimated construction time of 6-8 months.

How long does a single story extension take UK?

For a single storey extension, it will normally take around 3 months for the work to be completed.

Will a single storey extension add value?

For a standard single-storey extension, you can expect to add around 5-8% to the value of your house. Obviously, this will depend on the size, style and exact design of the extension.

How much does an extension cost UK 2021?

Single and Double Storey Extension Costs On average, a 30 square metre single storey extension built on a budget costs between £30,000 to £48,000. If your finances can stretch a bit more, a mid-range extension of this size usually costs between £51,000 and £60,000. These prices exclude fitting costs.

How much does it cost for architect to draw up plans?

Architects cost $2,000 to $20,000 to draw basic plans or $15,000 to $80,000+ for full house design and services. Average architect fees are 8% to 15% of construction costs to draw house plans or 10% to 20% for remodels. Architects charge hourly rates of $100 to $250 or $2 to $15 per square foot.

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What size extension can I build 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).

How much does architect cost for extension UK?

First of all, how much does an architect cost in the UK? The average cost to hire an architect can vary largely depending on the experience of the architect and the complexity of your project but generally you can expect and architect to charge between 5-10% of your overall build costs.

What are the stages of building an extension?

  • Site Establishment. …
  • Demolition/Groundworks/Drainage. …
  • Build structure/Roofing/External Finishes. …
  • Internal Renovation and Remodelling. …
  • Services, Internal Fitout and Finishes.

How long should a kitchen extension take?

With your builder hired and a date set for starting on site, contact your kitchen designer to place your order and arrange a time for delivery. The average extension takes 12 to 14 weeks, but a large project can take anywhere up to six months or a year.

Can you live in a house during an extension?

It is possible to live on site throughout a house extension, but aside from all the dust and mess, you may end up slowing down progress as the builders attempt to work around your life.

How long does it take to get planning permission for extension?

Whether you are proposing an extension, loft conversion or new build, planning permission usually takes eight weeks to be granted, unless your application is ‘unusually large or complex’, in which case the deadline can be extended to 13 weeks.

How long does the average house extension take?

A simple extension without any extensive interior works and that comes prefabricated can be erected in as little as a week. Larger extension projects requiring new foundations to be dug, external walls, roofing and windows to be installed and complex structural work can take six months and upwards.

How long does a wrap around extension take?

Planning permission applications can take up to eight weeks to be approved, so you’ll need to factor that into your timeline. When building work begins, a single storey wrap around extension will take around four months to complete, depending on the size and complexity of the project.

Can a house be built in 3 months?

When your plans have been approved and you have made your colour selections, then finally construction can begin. Reaching this stage in the process of building a new home in NSW, can take at least three months. However as we said early it can also take up to a year, depending on many factors.

How long does it take to build a house 2021?

Average Time It Takes to Build a House The average new home building process takes approximately seven to eight months, per the US Census Bureau. This timeframe includes finalizing plans and obtaining permits, the actual construction of the home, and the final walkthrough.

How long do housing estates take to build?

The claim: A standard housing development takes an average of five years to go through the planning system. Verdict: Developments of more than 1,000 dwellings may take that long, but those are very large. The vast majority of developments are much smaller and do not take that long.

Do you need an architect for an extension?

For a full planning application you will need professional architecture drawings, so the answer would be Yes. … Your architect should be able to create your more detailed building regulations drawings, and instruct a structural engineer on your behalf.

How much does a wrap around extension cost UK?

A wrap-around extension is one of the largest extension types, which is normally attached to the rear and side of the home. The average cost per square metre of a wrap-around extension is £2000 to £3000.

How can I save money on an extension?

  1. 1) Plan the size of your extension carefully. …
  2. 2) Types of extensions. …
  3. 3) Designing your extension. …
  4. 4) Fixed-price design extensions. …
  5. 5) Get detailed drawings done. …
  6. 6) Extension construction methods. …
  7. 7) Put robust contacts into place. …
  8. 8) Seek multiple contractor quotes.

Is Conservatory cheaper than extension?

Conservatories are often cheaper than an extension, too, although they don’t add the same value an extension does and they aren’t everyone’s cup of tea. Keeping a conservatory at a good temperature can be a struggle, with them often being too cold in winter and too hot in the summer.

Is a small extension worth it?

Even if your budget is small, a well thought-through addition to your house can make a tiny dining area more usable or create extra space for a home office. Extensions also can enhance natural light, link existing areas of the property, and improve the overall design, letting a space breathe a bit more.

How much will my house be worth after extension?

Nationwide’s research on the value of improvements to an average three bedroom house found that an extension creating a double bedroom and en-suite can add up to 23% to the value of your property. An extra bathroom could add up to 6% and an additional double bedroom can add 12%.

Can I design my own house without an architect?

In short, do you need an architect for a custom home? No. It is certainly not a bad idea to get your customization plans approved, but you can use a home designer or home builder to get the results you want for a lower cost.

What do architects charge per hour?

“If your architect is charging between $100 to $250 an hour, that’s in the normal fee range for Architectural fees.” From HomeAdvisor: “If you hire an architect on a hourly basis, they might charge you between $60 and $125 per hour for their services, though it can vary.

Do I need an architect to draw plans?

Your local building authorities require one. In most communities, for most remodels, an architect isn’t required. But in others—specifically some urban areas—you may need an architect or engineer to sign off on your plans. Check with your local building department to be sure.

Do you have to notify Neighbours permission for extension?

The technical term for this is called serving notice. In short if you want to make your home bigger and are attached to (or are in close proximity to) another property, you will most likely need to notify the neighbour(s) about your extension.