David N. Sonnesyn

David N. Sonnesyn, Energy Attorney in Longmont, Colorado

Over 61 years of legal practice · focused on Energy, Estate Planning, and General · 5.0/5 rating from 1 verified client review

AttorneyatThe Sonnesyn Law Firm

Longmont, CO

Practicing energy in Longmont since 1965.

61+
Years practicing
5.0 ★
1 client review
1
Bar admission

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Quick answer

David N. Sonnesyn is an attorney based in Longmont, CO. The practice focuses on Energy, Estate Planning, and General. David has over 61 years of legal experience. Currently practicing at The Sonnesyn Law Firm. Rated 5.0 out of 5 from 1 client review.

Based in
Longmont, CO
Experience
over 61 years
Known for
Energy · Estate Planning · General
  • Handles Energy, Estate Planning, and General matters from Longmont, CO.
  • Over 61 years of practice as a licensed attorney.
  • Recognized with AV Preeminent.

About David N. Sonnesyn: David N. Sonnesyn is an attorney based in Longmont, CO. The practice focuses on Energy, Estate Planning, and General. David has over 61 years of legal experience. Currently practicing at The Sonnesyn Law Firm. Rated 5.0 out of 5 from 1 client review.

Areas of practice

Practice areas handled by David N. Sonnesyn

David concentrates on energy, estate planning, general, probate, and real estate. Each area below outlines the kind of case David handles, typical outcomes to expect, and how the intake process starts.

Energy cases in Longmont, Colorado

David takes energy matters in Longmont, Colorado. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before David agrees to represent you.

Estate Planning cases in Longmont, Colorado

David takes estate planning matters in Longmont, Colorado. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before David agrees to represent you.

General cases in Longmont, Colorado

David takes general matters in Longmont, Colorado. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before David agrees to represent you.

Probate cases in Longmont, Colorado

David takes probate matters in Longmont, Colorado. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before David agrees to represent you.

Real Estate cases in Longmont, Colorado

David takes real estate matters in Longmont, Colorado. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before David agrees to represent you.

Biography

About David N. Sonnesyn — Over 61 years of Colorado energy experience

David N. Sonnesyn is an attorney based in Longmont, CO. The practice focuses on Energy, Estate Planning, and General. David has over 61 years of legal experience. Currently practicing at The Sonnesyn Law Firm. Rated 5.0 out of 5 from 1 client review.

David N. Sonnesyn is a lawyer practicing estate planning, estate administration, real estate and 3 other areas of law. David N. received a B.A. degree from University of Colorado at Boulder in 1961, and has been licensed for 61 years. David N. practices at The Sonnesyn Law Firm in Longmont, CO.

David's approach to energy cases

David N. Sonnesyn is a lawyer practicing estate planning, estate administration, real estate and 3 other areas of law. David N. received a B.A. degree from University of Colorado at Boulder in 1961, and has been licensed for 61 years. David N. practices at The Sonnesyn Law Firm in Longmont, CO.

Clients David works with

David reviews new inquiries case-by-case for energy, estate planning, and general matters in Longmont and the surrounding Colorado area.

Credentials

David N. Sonnesyn's legal education and bar admissions

  • University of Colorado at Boulder

    J.D. · 1965

  • University of Colorado at Boulder

    B.A. · 1961

Jurisdictions

David's state bar admissions

  • Colorado

    1965 · ACTIVE

David studied at J.D. in University of Colorado at Boulder and B.A. in University of Colorado at Boulder.

Law school and academic background

David completed J.D. in University of Colorado at Boulder and B.A. in University of Colorado at Boulder. Formal legal training is one signal of substantive knowledge — the day-to-day practice David runs in Colorado is where that training gets applied to real client questions.

Recognition

Awards, publications, and recognition of David N. Sonnesyn

David has received 1 formal recognition from bar associations, industry bodies, and peer-review services.

  • AV Preeminent

Legal awards and honors

AV Preeminent.

Affiliations

David's professional memberships and bar associations

  • Colorado Bar Association (Member, Board of Governors, 1973-1975) Christian Legal Society

    membership

Locations

David N. Sonnesyn's office in Longmont

David's primary office is at 1083 Purdue Drive, Longmont, CO, 80503. In-person meetings are by appointment; a phone intake usually comes first.

Main office

The Sonnesyn Law Firm

1083 Purdue Drive

Longmont, CO 80503

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Client feedback

Client reviews of David N. Sonnesyn — 5.0/5 rating from 1 verified client review

Every review below is from a verified client of David. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing energy attorneys in Longmont.

5.0

1 client review

Client ratings are sourced from public records and editorial research. Reviews on LawyersListed are accepted from verified clients once David N. Sonnesyn claims this profile.

Read all reviews

Hiring guide

How to hire David N. Sonnesyn — what to expect in your first consultation

Working with a new energy attorney should feel structured. Here's how the first two conversations with David usually go, from the moment you request a consult to the day representation begins.

Consultation formats and pricing

David charges for the initial consult. That fee is credited toward representation if you retain David's office.

What to bring to your first meeting

Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; David will tell you what matters and what doesn't.

Questions to ask a energy attorney in Longmont, Colorado

A short list to run through before you commit: How many energy matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?

Fees & payment

Fees, payment methods, and consultation options for David

David discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in energy practice — ask which fits.

Hourly rates, contingency fees, and flat-fee options

Every energy matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. David confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

David's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many energy practices work with clients on structured schedules.

Frequently asked

Frequently asked questions about David N. Sonnesyn

  • How much does it cost to hire David for a energy case?

    Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. David walks through the likely range during the consult so there are no surprises.

  • Does David offer a free consultation?

    David charges for the initial consult; that fee is credited toward representation if you retain David's office. Some energy attorneys offer free consults — check David's current terms during booking.

  • How long do energy cases in Colorado typically take?

    Simple energy matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. David gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

  • Can David take my case if I'm outside Longmont?

    David is licensed in Colorado. Matters governed by Colorado law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — David will tell you if the case is a fit or refer you to someone closer to your court.

  • What should I bring to my first meeting with David?

    Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. David will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.

  • Is David accepting new energy clients right now?

    David's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.

Areas served

Energy attorneys serving Longmont, Denver and Colorado Springs in Colorado

David handles energy matters throughout Colorado. Each city below is a direct link into the search page for verified energy attorneys in that community.

More counsel

If David's intake is full or the fit isn't right, these energy attorneys in Longmont handle similar matters. Every profile below is verified and open to consultations.