ONE PRACTICE, DESIGN THROUGH TO HANDOVER

House Extensions in Cottingham

The thing that stops more extensions than planning does is what is buried in the garden. A public sewer, a shared lateral drain or a manhole in the wrong place changes the foundation design and adds a consent nobody budgeted for. We survey it first, then design around what is actually there.

Book a Consultation07466 296416

Below Ground

sewers, shared drains and build over agreements.

There is an important difference between a private drain that serves only your house and a drain that serves anybody else's. A private branch can usually be diverted as part of the groundworks. A public sewer, or a lateral drain shared with neighbouring properties, belongs to the water authority, and extending over or close to it normally needs a build over or build near agreement before construction begins.

The agreement is not usually the obstacle. What causes the damage is finding out about it late, because by then the foundation layout has been drawn, the trenches may be open and the programme is already running. Established housing with long back gardens and older drainage runs, which describes a lot of property in and around Cottingham, is exactly where this turns up.

Where the sewer cannot be avoided, there are workable answers. The foundation can be deepened and bridged over the pipe, a section can be diverted with consent, or the extension footprint can shift a metre and remove the problem entirely. All three are easy decisions at design stage and expensive ones afterwards.

  • Drainage survey and cover lifting before the footprint is fixed
  • Build over and build near agreements with the water authority
  • Foundation design bridging or clear of an existing sewer
  • Private drain diversion designed into the groundworks
  • Surface water and soakaway strategy for the extended roof area

Our Process

how we work.

01

Site Visit

We measure the house and the plot, lift covers, and record where the drainage runs and which way it falls.

02

Below Ground

Where a public sewer or shared drain is involved, we establish what the water authority will require before design is fixed.

03

Options

Two or three approaches to the extension shape, tested against the drainage and the garden you want to keep.

04

Route

Permitted development, prior approval or a full application to East Riding of Yorkshire Council.

05

Approvals

Planning, building regulations, build over agreement and party wall notices, all managed by us.

06

Build

Groundworks to final decoration run by the architect who designed it, to the quoted figure.

Cottingham

find the drains before you draw the walls.

A drainage survey at the start is a small cost. A manhole discovered in an open foundation trench is a redesign, a delay and an awkward conversation with the water authority.

Planning authority: East Riding of Yorkshire Council

The Local Picture

a village core and the housing around it.

Cottingham has an old centre with the kind of surviving fabric that is likely to include a conservation area, and a much larger area of interwar, post-war and later housing around it. Which of those your house sits in changes the extension conversation completely. Near the core, permitted development rights may be reduced and the officer will take an interest in materials, roof form and anything visible from the street. Further out, the assessment is usually the ordinary one of scale, overlooking and daylight.

The larger detached and semi-detached houses on the outer roads tend to have the garden depth for a substantial rear extension and the side gap for a two storey or over-garage addition. That is a genuine advantage, but it is also where garden coverage limits and the subordinate-to-the-original test start to matter, because the easiest scheme to draw is often larger than the one that gets approved without argument.

The other thing a larger plot changes is the temptation to extend further than the plan can carry. A shallower extension across the full width usually produces a better house than a deep narrow one, and it gives a neighbour far less to object to on daylight.

  • Conservation area and Article 4 checks against your specific address
  • Single storey rear and full width extensions on established plots
  • Two storey and over-garage extensions where the side gap allows
  • Garden coverage tested against the permitted development limits
  • Scale and roof form designed to keep the addition subordinate
a village core and the housing around it. - The Yorkshire Architect

Approvals

what east riding of yorkshire council will assess.

If the scheme needs a full application, East Riding of Yorkshire Council will look at the effect on neighbouring amenity, at daylight and overlooking, at parking where a bedroom is being added, and at whether the extension reads as part of the house rather than bolted onto it. Those are the points the drawings need to answer, and a design and access statement written for your scheme rather than pulled from a template is part of answering them.

Building regulations run separately and cover the things nobody sees: foundations, structure, fire escape, insulation, ventilation and drainage. A scheme can hold planning permission and still be a long way from buildable. Because we design and build, the technical package is prepared as part of the same job rather than handed over to somebody else to interpret.

Because the same people carry both stages, a decision made for planning reasons is tested against what it will cost to build before it is committed to, rather than after.

  • Full householder applications and prior approval submissions
  • Design and access statement written for the actual scheme
  • Building regulations drawings, calculations and inspections
  • Party wall notices where a wall is shared or foundations cross the line
  • Officer and neighbour correspondence handled by the person who drew it
what east riding of yorkshire council will assess. - The Yorkshire Architect

Recent Work

projects near cottingham.

House Extensions by The Yorkshire ArchitectHouse Extensions by The Yorkshire ArchitectHouse Extensions by The Yorkshire ArchitectHouse Extensions by The Yorkshire Architect

Questions

house extensions in cottingham, answered.

Which council handles extensions in Cottingham?

East Riding of Yorkshire Council. Cottingham sits outside the Hull city boundary, so applications are determined under the East Riding local plan even though the town is close to the city. We submit through the Planning Portal and deal with the case officer directly.

What is a build over agreement?

It is consent from the water authority to build over or close to a public sewer or a shared lateral drain. It covers how the foundations protect the pipe and how access for maintenance is preserved. It is a separate consent from planning permission and from building regulations approval.

How do I know if there is a public sewer under my garden?

Lifting the covers on site is the fastest first check, and the direction of flow and the number of connections usually tell you whether the drain serves more than your house. A sewer records enquiry with the water authority confirms it. We do both before the footprint is settled.

Can I still extend if a sewer runs across the plot?

Usually yes. The common answers are to deepen and bridge the foundation over the pipe, to divert it with consent, or to move the extension footprint clear of it. Which one works depends on the depth and size of the pipe, which is why the survey comes first.

Is my house likely to be in a conservation area?

It depends entirely on where in Cottingham you are. The older core is the kind of area likely to carry a designation, while the interwar and later housing around it generally does not. We check your specific address rather than assuming a rule for the whole town, because the difference changes what is permitted.

Do I need planning permission for a rear extension?

Not always. Many single storey rear extensions fall within permitted development, subject to limits on depth, height and eaves height, with more generous limits for detached houses than for attached ones. Rights are reduced on designated land and can be removed by a condition on the original permission.

Can I extend over my garage?

Often, if the existing garage foundations and walls can carry the new floor and roof, which is checked rather than assumed because many garages were built to a lighter standard than the house. Where they cannot, underpinning or partial rebuilding is the usual answer and we would say so before you commit.

How much of the garden am I allowed to build on?

Permitted development caps the proportion of the original garden area that can be covered by buildings, which includes existing outbuildings as well as the new extension. On a generous plot this rarely bites. On a smaller one it can be the limit that decides the scheme rather than the depth.

Will the extension need deeper foundations near a tree?

It may. On shrinkable clay a mature tree close to the new work can require a significantly deeper foundation because of seasonal ground movement and root influence. Building control inspects the excavation before concrete is poured, so it is better to allow for the depth in the quote.

Do you deal with the neighbours?

Yes. We serve party wall notices where the Act applies and we handle the correspondence with the council, including any neighbour comments raised during consultation. Most neighbours consent in writing once they can see what is proposed and when the noisy stretch will be.

Do you build it as well as design it?

Yes. The architect who designs your extension oversees the build, which is unusual and is the point of the practice. The detail that was drawn is the detail that gets constructed, and the build cost quoted at the start is the one we stick to.

How long will my garden be a building site?

For a single storey rear extension, weeks rather than months, and the messiest part is the groundworks at the beginning. A two storey or over-garage scheme runs longer because of the roof and the internal work. We give you a programme with the quote rather than after the start.

book a cottingham site visit.

A free consultation, covers lifted, and a foundation strategy that accounts for what is under the garden before anything is drawn.

Book a ConsultationCall 07466 296416